cudf

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• Compare with main branch

🚨 Breaking Changes

• Pin dask and distributed for release (#12695) @galipremsagar
• Change ways to access ptr in Buffer (#12587) @galipremsagar
• Remove column names (#12578) @vuule
• Default cudf::io::read_json to nested JSON parser (#12544) @vuule
• Switch engine=cudf to the new JSON reader (#12509) @galipremsagar
• Add trailing comma support for nested JSON reader (#12448) @karthikeyann
• Upgrade to arrow-10.0.1 (#12327) @galipremsagar
• Fail loudly to avoid data corruption with unsupported input in read_orc (#12325) @vuule
• CSV, JSON reader to infer integer column with nulls as int64 instead of float64 (#12309) @karthikeyann
• Remove deprecated code for 23.02 (#12281) @vyasr
• Null element for parsing error in numeric types in JSON, CSV reader (#12272) @karthikeyann
• Purge non-empty nulls for superimpose_nulls and push_down_nulls (#12239) @ttnghia
• Rename cudf::structs::detail::superimpose_parent_nulls APIs (#12230) @ttnghia
• Remove JIT type names, refactor id_to_type. (#12158) @bdice
• Floor division uses integer division for integral arguments (#12131) @wence-

🐛 Bug Fixes

• Fix update-version.sh (#12745) @raydouglass
• Fix a mask data corruption in UDF (#12647) @galipremsagar
• pre-commit: Update isort version to 5.12.0 (#12645) @wence-
• tests: Skip cuInit tests if cuda-gdb is not found or not working (#12644) @wence-
• Revert regex program java APIs and tests (#12639) @cindyyuanjiang
• Fix leaks in ColumnVectorTest (#12625) @jlowe
• Handle when spillable buffers own each other (#12607) @madsbk
• Fix incorrect null counts for sliced columns in JCudfSerialization (#12589) @jlowe
• lists: Transfer dtypes correctly through list.get (#12586) @wence-
• timedelta: Don't go via float intermediates for floordiv (#12585) @wence-
• Fixing BUG, get_next_chunk() should use the blocking function device_read() (#12584) @madsbk
• Make JNI QuoteStyle accessible outside ai.rapids.cudf (#12572) @mythrocks
• partition_by_hash(): support index (#12554) @madsbk
• Mixed Join benchmark bug due to wrong conditional column (#12553) @divyegala
• Update List Lexicographical Comparator (#12538) @divyegala
• Dynamically read PTX version (#12534) @brandon-b-miller
• build.sh switch to use RAPIDS magic value (#12525) @robertmaynard
• Loosen runtime arrow pinning (#12522) @vyasr
• Enable metadata transfer for complex types in transpose (#12491) @galipremsagar
• Fix issues with parquet chunked reader (#12488) @nvdbaranec
• Fix missing metadata transfer in concat for ListColumn (#12487) @galipremsagar
• Rename libcudf substring source files to slice (#12484) @davidwendt
• Fix compile issue with arrow 10 (#12465) @ttnghia
• Fix List offsets bug in mixed type list column in nested JSON reader (#12447) @karthikeyann
• Fix xfail incompatibilities (#12423) @vyasr
• Fix bug in Parquet column index encoding (#12404) @etseidl
• When building Arrow shared look for a shared OpenSSL (#12396) @robertmaynard
• Fix get_json_object to return empty column on empty input (#12384) @davidwendt
• Pin arrow 9 in testing dependencies to prevent conda solve issues (#12377) @vyasr
• Fix reductions any/all return value for empty input (#12374) @davidwendt
• Fix debug compile errors in parquet.hpp (#12372) @davidwendt
• Purge non-empty nulls in cudf::make_lists_column (#12370) @ttnghia
• Use correct memory resource in io::make_column (#12364) @vyasr
• Add code to detect possible malformed page data in parquet files. (#12360) @nvdbaranec
• Fail loudly to avoid data corruption with unsupported input in read_orc (#12325) @vuule
• Fix NumericPairIteratorTest for float values (#12306) @davidwendt
• Fixes memory allocation in nested JSON tokenizer (#12300) @elstehle
• Reconstruct dtypes correctly for list aggs of struct columns (#12290) @wence-
• Fix regex \A and \Z to strictly match string begin/end (#12282) @davidwendt
• Fix compile issue in json_chunked_reader.cpp (#12280) @ttnghia
• Change reductions any/all to return valid values for empty input (#12279) @davidwendt
• Only exclude join keys that are indices from key columns (#12271) @wence-
• Fix spill to device limit (#12252) @madsbk
• Correct behaviour of sort in concat for singleton concatenations (#12247) @wence-
• Purge non-empty nulls for superimpose_nulls and push_down_nulls (#12239) @ttnghia
• Patch CUB DeviceSegmentedSort and remove workaround (#12234) @davidwendt
• Fix memory leak in udf_string::assign(&&) function (#12206) @davidwendt
• Workaround thrust-copy-if limit in json get_tree_representation (#12190) @davidwendt
• Fix page size calculation in Parquet writer (#12182) @etseidl
• Add cudf::detail::sizes_to_offsets_iterator to allow checking overflow in offsets (#12180) @davidwendt
• Workaround thrust-copy-if limit in wordpiece-tokenizer (#12168) @davidwendt
• Floor division uses integer division for integral arguments (#12131) @wence-

📖 Documentation

• Fix link to NVTX (#12598) @sameerz
• Include missing groupby functions in documentation (#12580) @quasiben
• Fix documentation author (#12527) @bdice
• Update libcudf reduction docs for casting output types (#12526) @davidwendt
• Add JSON reader page in user guide (#12499) @GregoryKimball
• Link unsupported iteration API docstrings (#12482) @galipremsagar
• strings_udf doc update (#12469) @brandon-b-miller
• Update cudf_assert docs with correct NDEBUG behavior (#12464) @robertmaynard
• Update pre-commit hooks guide (#12395) @bdice
• Update test docs to not use detail comparison utilities (#12332) @PointKernel
• Fix doxygen description for regex_program::compute_working_memory_size (#12329) @davidwendt
• Add eval to docs. (#12322) @vyasr
• Turn on xfail_strict=true (#12244) @wence-
• Update 10 minutes to cuDF (#12114) @wence-

🚀 New Features

• Use kvikIO as the default IO backend (#12574) @vuule
• Use has_nonempty_nulls instead of may_contain_non_empty_nulls in superimpose_nulls and push_down_nulls (#12560) @ttnghia
• Add strings methods removeprefix and removesuffix (#12557) @davidwendt
• Add regex_program java APIs and unit tests (#12548) @cindyyuanjiang
• Default cudf::io::read_json to nested JSON parser (#12544) @vuule
• Make string quoting optional on CSV write (#12539) @mythrocks
• Use new nvCOMP API to optimize the compression temp memory size (#12533) @vuule
• Support "values" orient (array of arrays) in Nested JSON reader (#12498) @karthikeyann
• one_hot_encode to use experimental row comparators (#12478) @divyegala
• Support %W and %w format specifiers in cudf::strings::to_timestamps (#12475) @davidwendt
• Add JSON Writer (#12474) @karthikeyann
• Refactor thrust_copy_if into cudf::detail::copy_if_safe (#12455) @ttnghia
• Add trailing comma support for nested JSON reader (#12448) @karthikeyann
• Extract tokenize_json.hpp detail header from src/io/json/nested_json.hpp (#12432) @ttnghia
• JNI bindings to write CSV (#12425) @mythrocks
• Nested JSON depth benchmark (#12371) @karthikeyann
• Implement lists::reverse (#12336) @ttnghia
• Use device_read in experimental read_json (#12314) @vuule
• Implement JNI for strings::reverse (#12283) @ttnghia
• Null element for parsing error in numeric types in JSON, CSV reader (#12272) @karthikeyann
• Add cudf::strings:like function with multiple patterns (#12269) @davidwendt
• Add environment variable to control host memory allocation in hostdevice_vector (#12251) @vuule
• Add cudf::strings::reverse function (#12227) @davidwendt
• Selectively use dictionary encoding in Parquet writer (#12211) @etseidl
• Support replace in strings_udf (#12207) @brandon-b-miller
• Add support to read binary encoded decimals in parquet (#12205) @PointKernel
• Support regex EOL where the string ends with a new-line character (#12181) @davidwendt
• Updating stream_compaction/unique to use new row comparators (#12159) @divyegala
• Add device buffer datasource (#12024) @PointKernel
• Implement groupby apply with JIT (#11452) @bwyogatama

🛠️ Improvements

• Update shared workflow branches (#12696) @ajschmidt8
• Pin dask and distributed for release (#12695) @galipremsagar
• Don't upload libcudf-example to Anaconda.org (#12671) @ajschmidt8
• Pin wheel dependencies to same RAPIDS release (#12659) @sevagh
• Use CTK 118/cp310 branch of wheel workflows (#12602) @sevagh
• Change ways to access ptr in Buffer (#12587) @galipremsagar
• Version a parquet writer xfail (#12579) @galipremsagar
• Remove column names (#12578) @vuule
• Parquet reader optimization to address V100 regression. (#12577) @nvdbaranec
• Add support for category dtypes in CSV reader (#12571) @galipremsagar
• Remove spill_lock parameter from SpillableBuffer.get_ptr() (#12564) @madsbk
• Optimize cudf::make_lists_column (#12547) @ttnghia
• Remove cudf::strings::repeat_strings_output_sizes from Java and JNI (#12546) @ttnghia
• Test that cuInit is not called when RAPIDS_NO_INITIALIZE is set (#12545) @wence-
• Rework repeat_strings to use sizes-to-offsets utility (#12543) @davidwendt
• Replace exclusive_scan with sizes_to_offsets in cudf::lists::sequences (#12541) @davidwendt
• Rework nvtext::ngrams_tokenize to use sizes-to-offsets utility (#12540) @davidwendt
• Fix binary-ops gtests coded in namespace cudf::test (#12536) @davidwendt
• More @acquire_spill_lock() and as_buffer(..., exposed=False) (#12535) @madsbk
• Guard CUDA runtime APIs with error checking (#12531) @PointKernel
• Update TODOs from issue 10432. (#12528) @bdice
• Update rapids-cmake definitions version in GitHub Actions style checks. (#12511) @bdice
• Switch engine=cudf to the new JSON reader (#12509) @galipremsagar
• Fix SUM/MEAN aggregation type support. (#12503) @bdice
• Stop using pandas._testing (#12492) @vyasr
• Fix ROLLING_TEST gtests coded in namespace cudf::test (#12490) @davidwendt
• Fix erroneously skipped ORC ZSTD test (#12486) @vuule
• Rework nvtext::generate_character_ngrams to use make_strings_children (#12480) @davidwendt
• Raise warnings as errors in the test suite (#12468) @vyasr
• Remove int32 hard-coding in python (#12467) @galipremsagar
• Use cudaMemcpyDefault. (#12466) @bdice
• Update workflows for nightly tests (#12462) @ajschmidt8
• Build CUDA 11.8 and Python 3.10 Packages (#12457) @ajschmidt8
• JNI build image default as cuda11.8 (#12441) @pxLi
• Re-enable Recently Updated Check (#12435) @ajschmidt8
• Rework remaining cudf::strings::from_xyz functions to use make_strings_children (#12434) @vuule
• Build wheels alongside conda CI (#12427) @sevagh
• Remove arguments for checking exception messages in Python (#12424) @vyasr
• Clean up cuco usage (#12421) @PointKernel
• Fix warnings in remaining modules (#12406) @vyasr
• Update ops-bot.yaml (#12402) @ajschmidt8
• Rework cudf::strings::integers_to_ipv4 to use make_strings_children utility (#12401) @davidwendt
• Use numpy.empty() instead of bytearray to allocate host memory for spilling (#12399) @madsbk
• Deprecate chunksize from dask_cudf.read_csv (#12394) @rjzamora
• Expose the RMM pool size in JNI (#12390) @revans2
• Fix COPYING_TEST: gtests coded in namespace cudf::test (#12387) @davidwendt
• Rework cudf::strings::url_encode to use make_strings_children utility (#12385) @davidwendt
• Use make_strings_children in parse_data nested json reader (#12382) @karthikeyann
• Fix warnings in test_datetime.py (#12381) @vyasr
• Mixed Join Benchmarks (#12375) @divyegala
• Fix warnings in dataframe.py (#12369) @vyasr
• Update conda recipes. (#12368) @bdice
• Use gpu-latest-1 runner tag (#12366) @bdice
• Rework cudf::strings::from_booleans to use make_strings_children (#12365) @vuule
• Fix warnings in test modules up to test_dataframe.py (#12355) @vyasr
• JSON column performance optimization - struct column nulls (#12354) @karthikeyann
• Accelerate stable-segmented-sort with CUB segmented sort (#12347) @davidwendt
• Add size check to make_offsets_child_column utility (#12345) @davidwendt
• Enable max compression ratio small block optimization for ZSTD (#12338) @vuule
• Fix warnings in test_monotonic.py (#12334) @vyasr
• Improve JSON column creation performance (list offsets) (#12330) @karthikeyann
• Upgrade to arrow-10.0.1 (#12327) @galipremsagar
• Fix warnings in test_orc.py (#12326) @vyasr
• Fix warnings in test_groupby.py (#12324) @vyasr
• Fix test_notebooks.sh (#12323) @ajschmidt8
• Fix transform gtests coded in namespace cudf::test (#12321) @davidwendt
• Fix check_style.sh script (#12320) @ajschmidt8
• Rework cudf::strings::from_timestamps to use make_strings_children (#12317) @davidwendt
• Fix warnings in test_index.py (#12313) @vyasr
• Fix warnings in test_multiindex.py (#12310) @vyasr
• CSV, JSON reader to infer integer column with nulls as int64 instead of float64 (#12309) @karthikeyann
• Fix warnings in test_indexing.py (#12305) @vyasr
• Fix warnings in test_joining.py (#12304) @vyasr
• Unpin dask and distributed for development (#12302) @galipremsagar
• Re-enable sccache for Jenkins builds (#12297) @ajschmidt8
• Define needs for pr-builder workflow. (#12296) @bdice
• Forward merge 22.12 into 23.02 (#12294) @vyasr
• Fix warnings in test_stats.py (#12293) @vyasr
• Fix table gtests coded in namespace cudf::test (#12292) @davidwendt
• Change cython for regex calls to use cudf::strings::regex_program (#12289) @davidwendt
• Improved error reporting when reading multiple JSON files (#12285) @vuule
• Deprecate Frame.sum_of_squares (#12284) @vyasr
• Remove deprecated code for 23.02 (#12281) @vyasr
• Clean up handling of max_page_size_bytes in Parquet writer (#12277) @etseidl
• Fix replace gtests coded in namespace cudf::test (#12270) @davidwendt
• Add pandas nullable type support in Index.to_pandas (#12268) @galipremsagar
• Rework nvtext::detokenize to use indexalator for row indices (#12267) @davidwendt
• Fix reduction gtests coded in namespace cudf::test (#12257) @davidwendt
• Remove default parameters from cudf::detail::sort function declarations (#12254) @davidwendt
• Add duplicated support for Series, DataFrame and Index (#12246) @galipremsagar
• Replace column/table test utilities with macros (#12242) @PointKernel
• Rework cudf::strings::pad and zfill to use make_strings_children (#12238) @davidwendt
• Fix sort gtests coded in namespace cudf::test (#12237) @davidwendt
• Wrapping concat and file writes in @acquire_spill_lock() (#12232) @madsbk
• Rename cudf::structs::detail::superimpose_parent_nulls APIs (#12230) @ttnghia
• Cover parsing to decimal types in read_json tests (#12229) @vuule
• Spill Statistics (#12223) @madsbk
• Use CUDF_JNI_ENABLE_PROFILING to conditionally enable profiling support. (#12221) @bdice
• Clean up of test_spilling.py (#12220) @madsbk
• Simplify repetitive boolean logic (#12218) @vuule
• Add Series.hasnans and Index.hasnans (#12214) @galipremsagar
• Add cudf::strings:udf::replace function (#12210) @davidwendt
• Adds in new java APIs for appending byte arrays to host columnar data (#12208) @revans2
• Remove Python dependencies from Java CI. (#12193) @bdice
• Fix null order in sort-based groupby and improve groupby tests (#12191) @divyegala
• Move strings children functions from cudf/strings/detail/utilities.cuh to new header (#12185) @davidwendt
• Clean up existing JNI scalar to column code (#12173) @revans2
• Remove JIT type names, refactor id_to_type. (#12158) @bdice
• Update JNI version to 23.02.0-SNAPSHOT (#12129) @pxLi
• Minor refactor of cpp/src/io/parquet/page_data.cu (#12126) @etseidl
• Add codespell as a linter (#12097) @benfred
• Enable specifying exceptions in error macros (#12078) @vyasr
• Move _label_encoding from Series to Column (#12040) @shwina
• Add GitHub Actions Workflows (#12002) @ajschmidt8
• Consolidate dask-cudf groupby_agg calls in one place (#10835) @charlesbluca

🚨 Breaking Changes

• Pin dask and distributed for release (#12695) @galipremsagar
• Change ways to access ptr in Buffer (#12587) @galipremsagar
• Remove column names (#12578) @vuule
• Default cudf::io::read_json to nested JSON parser (#12544) @vuule
• Switch engine=cudf to the new JSON reader (#12509) @galipremsagar
• Add trailing comma support for nested JSON reader (#12448) @karthikeyann
• Upgrade to arrow-10.0.1 (#12327) @galipremsagar
• Fail loudly to avoid data corruption with unsupported input in read_orc (#12325) @vuule
• CSV, JSON reader to infer integer column with nulls as int64 instead of float64 (#12309) @karthikeyann
• Remove deprecated code for 23.02 (#12281) @vyasr
• Null element for parsing error in numeric types in JSON, CSV reader (#12272) @karthikeyann
• Purge non-empty nulls for superimpose_nulls and push_down_nulls (#12239) @ttnghia
• Rename cudf::structs::detail::superimpose_parent_nulls APIs (#12230) @ttnghia
• Remove JIT type names, refactor id_to_type. (#12158) @bdice
• Floor division uses integer division for integral arguments (#12131) @wence-

🐛 Bug Fixes

• Fix a mask data corruption in UDF (#12647) @galipremsagar
• pre-commit: Update isort version to 5.12.0 (#12645) @wence-
• tests: Skip cuInit tests if cuda-gdb is not found or not working (#12644) @wence-
• Revert regex program java APIs and tests (#12639) @cindyyuanjiang
• Fix leaks in ColumnVectorTest (#12625) @jlowe
• Handle when spillable buffers own each other (#12607) @madsbk
• Fix incorrect null counts for sliced columns in JCudfSerialization (#12589) @jlowe
• lists: Transfer dtypes correctly through list.get (#12586) @wence-
• timedelta: Don't go via float intermediates for floordiv (#12585) @wence-
• Fixing BUG, get_next_chunk() should use the blocking function device_read() (#12584) @madsbk
• Make JNI QuoteStyle accessible outside ai.rapids.cudf (#12572) @mythrocks
• partition_by_hash(): support index (#12554) @madsbk
• Mixed Join benchmark bug due to wrong conditional column (#12553) @divyegala
• Update List Lexicographical Comparator (#12538) @divyegala
• Dynamically read PTX version (#12534) @brandon-b-miller
• build.sh switch to use RAPIDS magic value (#12525) @robertmaynard
• Loosen runtime arrow pinning (#12522) @vyasr
• Enable metadata transfer for complex types in transpose (#12491) @galipremsagar
• Fix issues with parquet chunked reader (#12488) @nvdbaranec
• Fix missing metadata transfer in concat for ListColumn (#12487) @galipremsagar
• Rename libcudf substring source files to slice (#12484) @davidwendt
• Fix compile issue with arrow 10 (#12465) @ttnghia
• Fix List offsets bug in mixed type list column in nested JSON reader (#12447) @karthikeyann
• Fix xfail incompatibilities (#12423) @vyasr
• Fix bug in Parquet column index encoding (#12404) @etseidl
• When building Arrow shared look for a shared OpenSSL (#12396) @robertmaynard
• Fix get_json_object to return empty column on empty input (#12384) @davidwendt
• Pin arrow 9 in testing dependencies to prevent conda solve issues (#12377) @vyasr
• Fix reductions any/all return value for empty input (#12374) @davidwendt
• Fix debug compile errors in parquet.hpp (#12372) @davidwendt
• Purge non-empty nulls in cudf::make_lists_column (#12370) @ttnghia
• Use correct memory resource in io::make_column (#12364) @vyasr
• Add code to detect possible malformed page data in parquet files. (#12360) @nvdbaranec
• Fail loudly to avoid data corruption with unsupported input in read_orc (#12325) @vuule
• Fix NumericPairIteratorTest for float values (#12306) @davidwendt
• Fixes memory allocation in nested JSON tokenizer (#12300) @elstehle
• Reconstruct dtypes correctly for list aggs of struct columns (#12290) @wence-
• Fix regex \A and \Z to strictly match string begin/end (#12282) @davidwendt
• Fix compile issue in json_chunked_reader.cpp (#12280) @ttnghia
• Change reductions any/all to return valid values for empty input (#12279) @davidwendt
• Only exclude join keys that are indices from key columns (#12271) @wence-
• Fix spill to device limit (#12252) @madsbk
• Correct behaviour of sort in concat for singleton concatenations (#12247) @wence-
• Purge non-empty nulls for superimpose_nulls and push_down_nulls (#12239) @ttnghia
• Patch CUB DeviceSegmentedSort and remove workaround (#12234) @davidwendt
• Fix memory leak in udf_string::assign(&&) function (#12206) @davidwendt
• Workaround thrust-copy-if limit in json get_tree_representation (#12190) @davidwendt
• Fix page size calculation in Parquet writer (#12182) @etseidl
• Add cudf::detail::sizes_to_offsets_iterator to allow checking overflow in offsets (#12180) @davidwendt
• Workaround thrust-copy-if limit in wordpiece-tokenizer (#12168) @davidwendt
• Floor division uses integer division for integral arguments (#12131) @wence-

📖 Documentation

• Fix link to NVTX (#12598) @sameerz
• Include missing groupby functions in documentation (#12580) @quasiben
• Fix documentation author (#12527) @bdice
• Update libcudf reduction docs for casting output types (#12526) @davidwendt
• Add JSON reader page in user guide (#12499) @GregoryKimball
• Link unsupported iteration API docstrings (#12482) @galipremsagar
• strings_udf doc update (#12469) @brandon-b-miller
• Update cudf_assert docs with correct NDEBUG behavior (#12464) @robertmaynard
• Update pre-commit hooks guide (#12395) @bdice
• Update test docs to not use detail comparison utilities (#12332) @PointKernel
• Fix doxygen description for regex_program::compute_working_memory_size (#12329) @davidwendt
• Add eval to docs. (#12322) @vyasr
• Turn on xfail_strict=true (#12244) @wence-
• Update 10 minutes to cuDF (#12114) @wence-

🚀 New Features

• Use kvikIO as the default IO backend (#12574) @vuule
• Use has_nonempty_nulls instead of may_contain_non_empty_nulls in superimpose_nulls and push_down_nulls (#12560) @ttnghia
• Add strings methods removeprefix and removesuffix (#12557) @davidwendt
• Add regex_program java APIs and unit tests (#12548) @cindyyuanjiang
• Default cudf::io::read_json to nested JSON parser (#12544) @vuule
• Make string quoting optional on CSV write (#12539) @mythrocks
• Use new nvCOMP API to optimize the compression temp memory size (#12533) @vuule
• Support "values" orient (array of arrays) in Nested JSON reader (#12498) @karthikeyann
• one_hot_encode to use experimental row comparators (#12478) @divyegala
• Support %W and %w format specifiers in cudf::strings::to_timestamps (#12475) @davidwendt
• Add JSON Writer (#12474) @karthikeyann
• Refactor thrust_copy_if into cudf::detail::copy_if_safe (#12455) @ttnghia
• Add trailing comma support for nested JSON reader (#12448) @karthikeyann
• Extract tokenize_json.hpp detail header from src/io/json/nested_json.hpp (#12432) @ttnghia
• JNI bindings to write CSV (#12425) @mythrocks
• Nested JSON depth benchmark (#12371) @karthikeyann
• Implement lists::reverse (#12336) @ttnghia
• Use device_read in experimental read_json (#12314) @vuule
• Implement JNI for strings::reverse (#12283) @ttnghia
• Null element for parsing error in numeric types in JSON, CSV reader (#12272) @karthikeyann
• Add cudf::strings:like function with multiple patterns (#12269) @davidwendt
• Add environment variable to control host memory allocation in hostdevice_vector (#12251) @vuule
• Add cudf::strings::reverse function (#12227) @davidwendt
• Selectively use dictionary encoding in Parquet writer (#12211) @etseidl
• Support replace in strings_udf (#12207) @brandon-b-miller
• Add support to read binary encoded decimals in parquet (#12205) @PointKernel
• Support regex EOL where the string ends with a new-line character (#12181) @davidwendt
• Updating stream_compaction/unique to use new row comparators (#12159) @divyegala
• Add device buffer datasource (#12024) @PointKernel
• Implement groupby apply with JIT (#11452) @bwyogatama

🛠️ Improvements

• Update shared workflow branches (#12696) @ajschmidt8
• Pin dask and distributed for release (#12695) @galipremsagar
• Don't upload libcudf-example to Anaconda.org (#12671) @ajschmidt8
• Pin wheel dependencies to same RAPIDS release (#12659) @sevagh
• Use CTK 118/cp310 branch of wheel workflows (#12602) @sevagh
• Change ways to access ptr in Buffer (#12587) @galipremsagar
• Version a parquet writer xfail (#12579) @galipremsagar
• Remove column names (#12578) @vuule
• Parquet reader optimization to address V100 regression. (#12577) @nvdbaranec
• Add support for category dtypes in CSV reader (#12571) @galipremsagar
• Remove spill_lock parameter from SpillableBuffer.get_ptr() (#12564) @madsbk
• Optimize cudf::make_lists_column (#12547) @ttnghia
• Remove cudf::strings::repeat_strings_output_sizes from Java and JNI (#12546) @ttnghia
• Test that cuInit is not called when RAPIDS_NO_INITIALIZE is set (#12545) @wence-
• Rework repeat_strings to use sizes-to-offsets utility (#12543) @davidwendt
• Replace exclusive_scan with sizes_to_offsets in cudf::lists::sequences (#12541) @davidwendt
• Rework nvtext::ngrams_tokenize to use sizes-to-offsets utility (#12540) @davidwendt
• Fix binary-ops gtests coded in namespace cudf::test (#12536) @davidwendt
• More @acquire_spill_lock() and as_buffer(..., exposed=False) (#12535) @madsbk
• Guard CUDA runtime APIs with error checking (#12531) @PointKernel
• Update TODOs from issue 10432. (#12528) @bdice
• Update rapids-cmake definitions version in GitHub Actions style checks. (#12511) @bdice
• Switch engine=cudf to the new JSON reader (#12509) @galipremsagar
• Fix SUM/MEAN aggregation type support. (#12503) @bdice
• Stop using pandas._testing (#12492) @vyasr
• Fix ROLLING_TEST gtests coded in namespace cudf::test (#12490) @davidwendt
• Fix erroneously skipped ORC ZSTD test (#12486) @vuule
• Rework nvtext::generate_character_ngrams to use make_strings_children (#12480) @davidwendt
• Raise warnings as errors in the test suite (#12468) @vyasr
• Remove int32 hard-coding in python (#12467) @galipremsagar
• Use cudaMemcpyDefault. (#12466) @bdice
• Update workflows for nightly tests (#12462) @ajschmidt8
• Build CUDA 11.8 and Python 3.10 Packages (#12457) @ajschmidt8
• JNI build image default as cuda11.8 (#12441) @pxLi
• Re-enable Recently Updated Check (#12435) @ajschmidt8
• Rework remaining cudf::strings::from_xyz functions to use make_strings_children (#12434) @vuule
• Build wheels alongside conda CI (#12427) @sevagh
• Remove arguments for checking exception messages in Python (#12424) @vyasr
• Clean up cuco usage (#12421) @PointKernel
• Fix warnings in remaining modules (#12406) @vyasr
• Update ops-bot.yaml (#12402) @ajschmidt8
• Rework cudf::strings::integers_to_ipv4 to use make_strings_children utility (#12401) @davidwendt
• Use numpy.empty() instead of bytearray to allocate host memory for spilling (#12399) @madsbk
• Deprecate chunksize from dask_cudf.read_csv (#12394) @rjzamora
• Expose the RMM pool size in JNI (#12390) @revans2
• Fix COPYING_TEST: gtests coded in namespace cudf::test (#12387) @davidwendt
• Rework cudf::strings::url_encode to use make_strings_children utility (#12385) @davidwendt
• Use make_strings_children in parse_data nested json reader (#12382) @karthikeyann
• Fix warnings in test_datetime.py (#12381) @vyasr
• Mixed Join Benchmarks (#12375) @divyegala
• Fix warnings in dataframe.py (#12369) @vyasr
• Update conda recipes. (#12368) @bdice
• Use gpu-latest-1 runner tag (#12366) @bdice
• Rework cudf::strings::from_booleans to use make_strings_children (#12365) @vuule
• Fix warnings in test modules up to test_dataframe.py (#12355) @vyasr
• JSON column performance optimization - struct column nulls (#12354) @karthikeyann
• Accelerate stable-segmented-sort with CUB segmented sort (#12347) @davidwendt
• Add size check to make_offsets_child_column utility (#12345) @davidwendt
• Enable max compression ratio small block optimization for ZSTD (#12338) @vuule
• Fix warnings in test_monotonic.py (#12334) @vyasr
• Improve JSON column creation performance (list offsets) (#12330) @karthikeyann
• Upgrade to arrow-10.0.1 (#12327) @galipremsagar
• Fix warnings in test_orc.py (#12326) @vyasr
• Fix warnings in test_groupby.py (#12324) @vyasr
• Fix test_notebooks.sh (#12323) @ajschmidt8
• Fix transform gtests coded in namespace cudf::test (#12321) @davidwendt
• Fix check_style.sh script (#12320) @ajschmidt8
• Rework cudf::strings::from_timestamps to use make_strings_children (#12317) @davidwendt
• Fix warnings in test_index.py (#12313) @vyasr
• Fix warnings in test_multiindex.py (#12310) @vyasr
• CSV, JSON reader to infer integer column with nulls as int64 instead of float64 (#12309) @karthikeyann
• Fix warnings in test_indexing.py (#12305) @vyasr
• Fix warnings in test_joining.py (#12304) @vyasr
• Unpin dask and distributed for development (#12302) @galipremsagar
• Re-enable sccache for Jenkins builds (#12297) @ajschmidt8
• Define needs for pr-builder workflow. (#12296) @bdice
• Forward merge 22.12 into 23.02 (#12294) @vyasr
• Fix warnings in test_stats.py (#12293) @vyasr
• Fix table gtests coded in namespace cudf::test (#12292) @davidwendt
• Change cython for regex calls to use cudf::strings::regex_program (#12289) @davidwendt
• Improved error reporting when reading multiple JSON files (#12285) @vuule
• Deprecate Frame.sum_of_squares (#12284) @vyasr
• Remove deprecated code for 23.02 (#12281) @vyasr
• Clean up handling of max_page_size_bytes in Parquet writer (#12277) @etseidl
• Fix replace gtests coded in namespace cudf::test (#12270) @davidwendt
• Add pandas nullable type support in Index.to_pandas (#12268) @galipremsagar
• Rework nvtext::detokenize to use indexalator for row indices (#12267) @davidwendt
• Fix reduction gtests coded in namespace cudf::test (#12257) @davidwendt
• Remove default parameters from cudf::detail::sort function declarations (#12254) @davidwendt
• Add duplicated support for Series, DataFrame and Index (#12246) @galipremsagar
• Replace column/table test utilities with macros (#12242) @PointKernel
• Rework cudf::strings::pad and zfill to use make_strings_children (#12238) @davidwendt
• Fix sort gtests coded in namespace cudf::test (#12237) @davidwendt
• Wrapping concat and file writes in @acquire_spill_lock() (#12232) @madsbk
• Rename cudf::structs::detail::superimpose_parent_nulls APIs (#12230) @ttnghia
• Cover parsing to decimal types in read_json tests (#12229) @vuule
• Spill Statistics (#12223) @madsbk
• Use CUDF_JNI_ENABLE_PROFILING to conditionally enable profiling support. (#12221) @bdice
• Clean up of test_spilling.py (#12220) @madsbk
• Simplify repetitive boolean logic (#12218) @vuule
• Add Series.hasnans and Index.hasnans (#12214) @galipremsagar
• Add cudf::strings:udf::replace function (#12210) @davidwendt
• Adds in new java APIs for appending byte arrays to host columnar data (#12208) @revans2
• Remove Python dependencies from Java CI. (#12193) @bdice
• Fix null order in sort-based groupby and improve groupby tests (#12191) @divyegala
• Move strings children functions from cudf/strings/detail/utilities.cuh to new header (#12185) @davidwendt
• Clean up existing JNI scalar to column code (#12173) @revans2
• Remove JIT type names, refactor id_to_type. (#12158) @bdice
• Update JNI version to 23.02.0-SNAPSHOT (#12129) @pxLi
• Minor refactor of cpp/src/io/parquet/page_data.cu (#12126) @etseidl
• Add codespell as a linter (#12097) @benfred
• Enable specifying exceptions in error macros (#12078) @vyasr
• Move _label_encoding from Series to Column (#12040) @shwina
• Add GitHub Actions Workflows (#12002) @ajschmidt8
• Consolidate dask-cudf groupby_agg calls in one place (#10835) @charlesbluca

🚨 Breaking Changes

• Add JNI for substring without 'end' parameter. (#12113) @firestarman
• Refactor purge_nonempty_nulls (#12111) @ttnghia
• Create an int8 column in read_csv when all elements are missing (#12110) @vuule
• Throw an error when libcudf is built without cuFile and LIBCUDF_CUFILE_POLICY is set to "ALWAYS" (#12080) @vuule
• Fix type promotion edge cases in numerical binops (#12074) @wence-
• Reduce/Remove reliance on **kwargs and *args in IO readers & writers (#12025) @galipremsagar
• Rollback of DeviceBufferLike (#12009) @madsbk
• Remove unused managed_allocator (#12005) @vyasr
• Pass column names to write_csv instead of table_metadata pointer (#11972) @vuule
• Accept const refs instead of const unique_ptr refs in reduce and scan APIs. (#11960) @vyasr
• Default to equal NaNs in make_merge_sets_aggregation. (#11952) @bdice
• Remove validation that requires introspection (#11938) @vyasr
• Trim quotes for non-string values in nested json parsing (#11898) @karthikeyann
• Add tests ensuring that cudf's default stream is always used (#11875) @vyasr
• Support nested types as groupby keys in libcudf (#11792) @PointKernel
• Default to equal NaNs in make_collect_set_aggregation. (#11621) @bdice
• Removing int8 column option from parquet byte_array writing (#11539) @hyperbolic2346
• part1: Simplify BaseIndex to an abstract class (#10389) @skirui-source

🐛 Bug Fixes

• strings_udf: use libcudf caching of character tables (#12343) @wence-
• Fix include line for IO Cython modules (#12250) @vyasr
• Make dask pinning looser (#12231) @vyasr
• Workaround for CUB segmented-sort bug with boolean keys (#12217) @davidwendt
• Fix from_dict backend dispatch to match upstream dask (#12203) @galipremsagar
• Merge branch-22.10 into branch-22.12 (#12198) @davidwendt
• Fix compression in ORC writer (#12194) @vuule
• Don't use CMake 3.25.0 as it has a show stopping FindCUDAToolkit bug (#12188) @robertmaynard
• Fix data corruption when reading ORC files with empty stripes (#12160) @vuule
• Fix decimal binary operations (#12142) @galipremsagar
• Ensure dlpack include is provided to cudf interop lib (#12139) @robertmaynard
• Safely allocate udf_string pointers in strings_udf (#12138) @brandon-b-miller
• Fix/disable jitify lto (#12122) @robertmaynard
• Fix conditional_full_join benchmark (#12121) @GregoryKimball
• Fix regex working-memory-size refactor error (#12119) @davidwendt
• Add in negative size checks for columns (#12118) @revans2
• Add JNI for substring without 'end' parameter. (#12113) @firestarman
• Fix reading of CSV files with blank second row (#12098) @vuule
• Fix an error in IO with GzipFile type (#12085) @galipremsagar
• Workaround groupby aggregate thrust::copy_if overflow (#12079) @davidwendt
• Fix alignment of compressed blocks in ORC writer (#12077) @vuule
• Fix singleton-range __setitem__ edge case (#12075) @wence-
• Fix type promotion edge cases in numerical binops (#12074) @wence-
• Force using old fmt in nvbench. (#12067) @vyasr
• Fixes List offset bug in Nested JSON reader (#12060) @karthikeyann
• Allow falling back to shim_60.ptx by default in strings_udf (#12056) @brandon-b-miller
• Force black exclusions for pre-commit. (#12036) @bdice
• Add memory_usage & items implementation for Struct column & dtype (#12033) @galipremsagar
• Reduce/Remove reliance on **kwargs and *args in IO readers & writers (#12025) @galipremsagar
• Fixes bug in csv_reader_options construction in cython (#12021) @karthikeyann
• Fix issues when both usecols and names options are used in read_csv (#12018) @vuule
• Port thrust's pinned_allocator to cudf, since Thrust 1.17 removes the type (#12004) @robertmaynard
• Revert "Replace most of preprocessor usage in nvcomp adapter with constexpr" (#11999) @vuule
• Fix bug where df.loc resulting in single row could give wrong index (#11998) @eriknw
• Switch to DISABLE_DEPRECATION_WARNINGS to match other RAPIDS projects (#11989) @robertmaynard
• Fix maximum page size estimate in Parquet writer (#11962) @vuule
• Fix local offset handling in bgzip reader (#11918) @upsj
• Fix an issue reading struct-of-list types in Parquet. (#11910) @nvdbaranec
• Fix memcheck error in TypeInference.Timestamp gtest (#11905) @davidwendt
• Fix type casting in Series.setitem (#11904) @wence-
• Fix memcheck error in get_dremel_data (#11903) @davidwendt
• Fixes Unsupported column type error due to empty list columns in Nested JSON reader (#11897) @karthikeyann
• Fix segmented-sort to ignore indices outside the offsets (#11888) @davidwendt
• Fix cudf::stable_sorted_order for NaN and -NaN in FLOAT64 columns (#11874) @davidwendt
• Fix writing of Parquet files with many fragments (#11869) @etseidl
• Fix RangeIndex unary operators. (#11868) @vyasr
• JNI Avoid NPE for reading host binary data (#11865) @revans2
• Fix decimal benchmark input data generation (#11863) @karthikeyann
• Fix pre-commit copyright check (#11860) @galipremsagar
• Fix Parquet support for seconds and milliseconds duration types (#11854) @vuule
• Ensure better compiler cache results between cudf cal-ver branches (#11835) @robertmaynard
• Fix make_column_from_scalar for all-null strings column (#11807) @davidwendt
• Tell jitify_preprocess where to search for libnvrtc (#11787) @robertmaynard
• add V2 page header support to parquet reader (#11778) @etseidl
• Parquet reader: bug fix for a num_rows/skip_rows corner case, w/optimization for nested preprocessing (#11752) @nvdbaranec
• Determine if Arrow has S3 support at runtime in unit test. (#11560) @bdice

📖 Documentation

• Use rapidsai CODE_OF_CONDUCT.md (#12166) @bdice
• Add symlinks to notebooks. (#12128) @bdice
• Add truncate API to python doc pages (#12109) @galipremsagar
• Update Numba docs links. (#12107) @bdice
• Remove "Multi-GPU with Dask-cuDF" notebook. (#12095) @bdice
• Fix link to c++ developer guide from CONTRIBUTING.md (#12084) @brandon-b-miller
• Add pivot_table and crosstab to docs. (#12014) @bdice
• Fix doxygen text for cudf::dictionary::encode (#11991) @davidwendt
• Replace default_stream_value with get_default_stream in docs. (#11985) @vyasr
• Add dtype docs pages and docstrings for cudf specific dtypes (#11974) @galipremsagar
• Update Unit Testing in libcudf guidelines to code tests outside the cudf::test namespace (#11959) @davidwendt
• Rename libcudf++ to libcudf. (#11953) @bdice
• Fix documentation referring to removed as_gpu_matrix method. (#11937) @bdice
• Remove "experimental" warning for struct columns in ORC reader and writer (#11880) @vuule
• Initial draft of policies and guidelines for libcudf usage. (#11853) @vyasr
• Add clear indication of non-GPU accelerated parameters in read_json docstring (#11825) @GregoryKimball
• Add developer docs for writing tests (#11199) @vyasr

🚀 New Features

• Adds an EventHandler to Java MemoryBuffer to be invoked on close (#12125) @abellina
• Support + in strings_udf (#12117) @brandon-b-miller
• Support upper and lower in strings_udf (#12099) @brandon-b-miller
• Add wheel builds (#12096) @vyasr
• Allow setting malloc heap size in string udfs (#12094) @brandon-b-miller
• Support strip, lstrip, and rstrip in strings_udf (#12091) @brandon-b-miller
• Mark nvcomp zstd compression stable (#12059) @jbrennan333
• Add debug-only onAllocated/onDeallocated to RmmEventHandler (#12054) @abellina
• Enable building against the libarrow contained in pyarrow (#12034) @vyasr
• Add strings like jni and native method (#12032) @cindyyuanjiang
• Cleanup common parsing code in JSON, CSV reader (#12022) @karthikeyann
• byte_range support for JSON Lines format (#12017) @karthikeyann
• Minor cleanup of root CMakeLists.txt for better organization (#11988) @robertmaynard
• Add inplace arithmetic operators to MaskedType (#11987) @brandon-b-miller
• Implement JNI for chunked Parquet reader (#11961) @ttnghia
• Add method argument to DataFrame.quantile (#11957) @rjzamora
• Add gpu memory watermark apis to JNI (#11950) @abellina
• Adds retryCount to RmmEventHandler.onAllocFailure (#11940) @abellina
• Enable returning string data from UDFs used through apply (#11933) @brandon-b-miller
• Switch over to rapids-cmake patches for thrust (#11921) @robertmaynard
• Add strings udf C++ classes and functions for phase II (#11912) @davidwendt
• Trim quotes for non-string values in nested json parsing (#11898) @karthikeyann
• Enable CEC for strings_udf (#11884) @brandon-b-miller
• ArrowIPCTableWriter writes en empty batch in the case of an empty table. (#11883) @firestarman
• Implement chunked Parquet reader (#11867) @ttnghia
• Add read_orc_metadata to libcudf (#11815) @vuule
• Support nested types as groupby keys in libcudf (#11792) @PointKernel
• Adding feature Truncate to DataFrame and Series (#11435) @VamsiTallam95

🛠️ Improvements

• Reduce number of tests marked spilling (#12197) @madsbk
• Pin dask and distributed for release (#12165) @galipremsagar
• Don't rely on GNU find in headers_test.sh (#12164) @wence-
• Update cp.clip call (#12148) @quasiben
• Enable automatic column projection in groupby().agg (#12124) @rjzamora
• Refactor purge_nonempty_nulls (#12111) @ttnghia
• Create an int8 column in read_csv when all elements are missing (#12110) @vuule
• Spilling to host memory (#12106) @madsbk
• First pass of pd.read_orc changes in tests (#12103) @galipremsagar
• Expose engine argument in dask_cudf.read_json (#12101) @rjzamora
• Remove CUDA 10 compatibility code. (#12088) @bdice
• Move and update dask nigthly install in CI (#12082) @galipremsagar
• Throw an error when libcudf is built without cuFile and LIBCUDF_CUFILE_POLICY is set to "ALWAYS" (#12080) @vuule
• Remove macros that inspect the contents of exceptions (#12076) @vyasr
• Fix ingest_raw_data performance issue in Nested JSON reader due to RVO (#12070) @karthikeyann
• Remove overflow error during decimal binops (#12063) @galipremsagar
• Change cudf::detail::tdigest to cudf::tdigest::detail (#12050) @davidwendt
• Fix quantile gtests coded in namespace cudf::test (#12049) @davidwendt
• Add support for DataFrame.from_dict`to_dictandSeries.to_dict` (#12048) @galipremsagar
• Refactor Parquet reader (#12046) @ttnghia
• Forward merge 22.10 into 22.12 (#12045) @vyasr
• Standardize newlines at ends of files. (#12042) @bdice
• Trim trailing whitespace from all files. (#12041) @bdice
• Use nosync policy in gather and scatter implementations. (#12038) @bdice
• Remove smart quotes from all docstrings. (#12035) @bdice
• Update cuda-python dependency to 11.7.1 (#12030) @galipremsagar
• Add cython-lint to pre-commit checks. (#12020) @bdice
• Use pragma once (#12019) @bdice
• New GHA to add issues/prs to project board (#12016) @jarmak-nv
• Add DataFrame.pivot_table. (#12015) @bdice
• Rollback of DeviceBufferLike (#12009) @madsbk
• Remove default parameters for nvtext::detail functions (#12007) @davidwendt
• Remove default parameters for cudf::dictionary::detail functions (#12006) @davidwendt
• Remove unused managed_allocator (#12005) @vyasr
• Remove default parameters for cudf::strings::detail functions (#12003) @davidwendt
• Remove unnecessary code from dask-cudf _Frame (#12001) @rjzamora
• Ignore python docs build artifacts (#12000) @galipremsagar
• Use rapids-cmake for google benchmark. (#11997) @vyasr
• Leverage rapids_cython for more automated RPATH handling (#11996) @vyasr
• Remove stale labeler (#11995) @raydouglass
• Move protobuf compilation to CMake (#11986) @vyasr
• Replace most of preprocessor usage in nvcomp adapter with constexpr (#11980) @vuule
• Add missing noexcepts to column_in_metadata methods (#11973) @vyasr
• Pass column names to write_csv instead of table_metadata pointer (#11972) @vuule
• Accelerate libcudf segmented sort with CUB segmented sort (#11969) @davidwendt
• Feature/remove default streams (#11967) @vyasr
• Add pool memory resource to libcudf basic example (#11966) @davidwendt
• Fix some libcudf calls to cudf::detail::gather (#11963) @davidwendt
• Accept const refs instead of const unique_ptr refs in reduce and scan APIs. (#11960) @vyasr
• Add deprecation warning for set_allocator. (#11958) @vyasr
• Fix lists and structs gtests coded in namespace cudf::test (#11956) @davidwendt
• Add full page indexes to Parquet writer benchmarks (#11955) @etseidl
• Use gather-based strings factory in cudf::strings::strip (#11954) @davidwendt
• Default to equal NaNs in make_merge_sets_aggregation. (#11952) @bdice
• Add strip_delimiters option to read_text (#11946) @upsj
• Refactor multibyte_split output_builder (#11945) @upsj
• Remove validation that requires introspection (#11938) @vyasr
• Add .str.find_multiple API (#11928) @galipremsagar
• Add regex_program class for use with all regex APIs (#11927) @davidwendt
• Enable backend dispatching for Dask-DataFrame creation (#11920) @rjzamora
• Performance improvement in JSON Tree traversal (#11919) @karthikeyann
• Fix some gtests incorrectly coded in namespace cudf::test (part I) (#11917) @davidwendt
• Refactor pad/zfill functions for reuse with strings udf (#11914) @davidwendt
• Add nanosecond & microsecond to DatetimeProperties (#11911) @galipremsagar
• Pin mimesis version in setup.py. (#11906) @bdice
• Error on ListColumn or any new unsupported column in cudf.Index (#11902) @galipremsagar
• Add thrust output iterator fix (1805) to thrust.patch (#11900) @davidwendt
• Relax codecov threshold diff (#11899) @galipremsagar
• Use public APIs in STREAM_COMPACTION_NVBENCH (#11892) @GregoryKimball
• Add coverage for string UDF tests. (#11891) @vyasr
• Provide data_chunk_source wrapper for datasource (#11886) @upsj
• Handle multibyte_split byte_range out-of-bounds offsets on host (#11885) @upsj
• Add tests ensuring that cudf's default stream is always used (#11875) @vyasr
• Change expect_strings_empty into expect_column_empty libcudf test utility (#11873) @davidwendt
• Add ngroup (#11871) @shwina
• Reduce memory usage in nested JSON parser - tree generation (#11864) @karthikeyann
• Unpin dask and distributed for development (#11859) @galipremsagar
• Remove unused includes for table/row_operators (#11857) @GregoryKimball
• Use conda-forge's pyorc (#11855) @jakirkham
• Add libcudf strings examples (#11849) @davidwendt
• Remove cudf_io namespace alias (#11827) @vuule
• Test/remove thrust vector usage (#11813) @vyasr
• Add BGZIP reader to python read_text (#11802) @upsj
• Merge branch-22.10 into branch-22.12 (#11801) @davidwendt
• Fix compile warning from CUDF_FUNC_RANGE in a member function (#11798) @davidwendt
• Update cudf JNI version to 22.12.0-SNAPSHOT (#11764) @pxLi
• Update flake8 to 5.0.4 and use flake8-force to check Cython. (#11736) @bdice
• Add BGZIP multibyte_split benchmark (#11723) @upsj
• Bifurcate Dependency Lists (#11674) @bdice
• Default to equal NaNs in make_collect_set_aggregation. (#11621) @bdice
• Conform "bench_isin" to match generator column names (#11549) @GregoryKimball
• Removing int8 column option from parquet byte_array writing (#11539) @hyperbolic2346
• Add checks for HLG layers in dask-cudf groupby tests (#10853) @charlesbluca
• part1: Simplify BaseIndex to an abstract class (#10389) @skirui-source
• Make all nvcc warnings into errors (#8916) @trxcllnt

🚨 Breaking Changes

• Add JNI for substring without 'end' parameter. (#12113) @firestarman
• Refactor purge_nonempty_nulls (#12111) @ttnghia
• Create an int8 column in read_csv when all elements are missing (#12110) @vuule
• Throw an error when libcudf is built without cuFile and LIBCUDF_CUFILE_POLICY is set to "ALWAYS" (#12080) @vuule
• Fix type promotion edge cases in numerical binops (#12074) @wence-
• Reduce/Remove reliance on **kwargs and *args in IO readers & writers (#12025) @galipremsagar
• Rollback of DeviceBufferLike (#12009) @madsbk
• Remove unused managed_allocator (#12005) @vyasr
• Pass column names to write_csv instead of table_metadata pointer (#11972) @vuule
• Accept const refs instead of const unique_ptr refs in reduce and scan APIs. (#11960) @vyasr
• Default to equal NaNs in make_merge_sets_aggregation. (#11952) @bdice
• Remove validation that requires introspection (#11938) @vyasr
• Trim quotes for non-string values in nested json parsing (#11898) @karthikeyann
• Add tests ensuring that cudf's default stream is always used (#11875) @vyasr
• Support nested types as groupby keys in libcudf (#11792) @PointKernel
• Default to equal NaNs in make_collect_set_aggregation. (#11621) @bdice
• Removing int8 column option from parquet byte_array writing (#11539) @hyperbolic2346
• part1: Simplify BaseIndex to an abstract class (#10389) @skirui-source

🐛 Bug Fixes

• Fix include line for IO Cython modules (#12250) @vyasr
• Make dask pinning looser (#12231) @vyasr
• Workaround for CUB segmented-sort bug with boolean keys (#12217) @davidwendt
• Fix from_dict backend dispatch to match upstream dask (#12203) @galipremsagar
• Merge branch-22.10 into branch-22.12 (#12198) @davidwendt
• Fix compression in ORC writer (#12194) @vuule
• Don't use CMake 3.25.0 as it has a show stopping FindCUDAToolkit bug (#12188) @robertmaynard
• Fix data corruption when reading ORC files with empty stripes (#12160) @vuule
• Fix decimal binary operations (#12142) @galipremsagar
• Ensure dlpack include is provided to cudf interop lib (#12139) @robertmaynard
• Safely allocate udf_string pointers in strings_udf (#12138) @brandon-b-miller
• Fix/disable jitify lto (#12122) @robertmaynard
• Fix conditional_full_join benchmark (#12121) @GregoryKimball
• Fix regex working-memory-size refactor error (#12119) @davidwendt
• Add in negative size checks for columns (#12118) @revans2
• Add JNI for substring without 'end' parameter. (#12113) @firestarman
• Fix reading of CSV files with blank second row (#12098) @vuule
• Fix an error in IO with GzipFile type (#12085) @galipremsagar
• Workaround groupby aggregate thrust::copy_if overflow (#12079) @davidwendt
• Fix alignment of compressed blocks in ORC writer (#12077) @vuule
• Fix singleton-range __setitem__ edge case (#12075) @wence-
• Fix type promotion edge cases in numerical binops (#12074) @wence-
• Force using old fmt in nvbench. (#12067) @vyasr
• Fixes List offset bug in Nested JSON reader (#12060) @karthikeyann
• Allow falling back to shim_60.ptx by default in strings_udf (#12056) @brandon-b-miller
• Force black exclusions for pre-commit. (#12036) @bdice
• Add memory_usage & items implementation for Struct column & dtype (#12033) @galipremsagar
• Reduce/Remove reliance on **kwargs and *args in IO readers & writers (#12025) @galipremsagar
• Fixes bug in csv_reader_options construction in cython (#12021) @karthikeyann
• Fix issues when both usecols and names options are used in read_csv (#12018) @vuule
• Port thrust's pinned_allocator to cudf, since Thrust 1.17 removes the type (#12004) @robertmaynard
• Revert "Replace most of preprocessor usage in nvcomp adapter with constexpr" (#11999) @vuule
• Fix bug where df.loc resulting in single row could give wrong index (#11998) @eriknw
• Switch to DISABLE_DEPRECATION_WARNINGS to match other RAPIDS projects (#11989) @robertmaynard
• Fix maximum page size estimate in Parquet writer (#11962) @vuule
• Fix local offset handling in bgzip reader (#11918) @upsj
• Fix an issue reading struct-of-list types in Parquet. (#11910) @nvdbaranec
• Fix memcheck error in TypeInference.Timestamp gtest (#11905) @davidwendt
• Fix type casting in Series.setitem (#11904) @wence-
• Fix memcheck error in get_dremel_data (#11903) @davidwendt
• Fixes Unsupported column type error due to empty list columns in Nested JSON reader (#11897) @karthikeyann
• Fix segmented-sort to ignore indices outside the offsets (#11888) @davidwendt
• Fix cudf::stable_sorted_order for NaN and -NaN in FLOAT64 columns (#11874) @davidwendt
• Fix writing of Parquet files with many fragments (#11869) @etseidl
• Fix RangeIndex unary operators. (#11868) @vyasr
• JNI Avoid NPE for reading host binary data (#11865) @revans2
• Fix decimal benchmark input data generation (#11863) @karthikeyann
• Fix pre-commit copyright check (#11860) @galipremsagar
• Fix Parquet support for seconds and milliseconds duration types (#11854) @vuule
• Ensure better compiler cache results between cudf cal-ver branches (#11835) @robertmaynard
• Fix make_column_from_scalar for all-null strings column (#11807) @davidwendt
• Tell jitify_preprocess where to search for libnvrtc (#11787) @robertmaynard
• add V2 page header support to parquet reader (#11778) @etseidl
• Parquet reader: bug fix for a num_rows/skip_rows corner case, w/optimization for nested preprocessing (#11752) @nvdbaranec
• Determine if Arrow has S3 support at runtime in unit test. (#11560) @bdice

📖 Documentation

• Use rapidsai CODE_OF_CONDUCT.md (#12166) @bdice
• Add symlinks to notebooks. (#12128) @bdice
• Add truncate API to python doc pages (#12109) @galipremsagar
• Update Numba docs links. (#12107) @bdice
• Remove "Multi-GPU with Dask-cuDF" notebook. (#12095) @bdice
• Fix link to c++ developer guide from CONTRIBUTING.md (#12084) @brandon-b-miller
• Add pivot_table and crosstab to docs. (#12014) @bdice
• Fix doxygen text for cudf::dictionary::encode (#11991) @davidwendt
• Replace default_stream_value with get_default_stream in docs. (#11985) @vyasr
• Add dtype docs pages and docstrings for cudf specific dtypes (#11974) @galipremsagar
• Update Unit Testing in libcudf guidelines to code tests outside the cudf::test namespace (#11959) @davidwendt
• Rename libcudf++ to libcudf. (#11953) @bdice
• Fix documentation referring to removed as_gpu_matrix method. (#11937) @bdice
• Remove "experimental" warning for struct columns in ORC reader and writer (#11880) @vuule
• Initial draft of policies and guidelines for libcudf usage. (#11853) @vyasr
• Add clear indication of non-GPU accelerated parameters in read_json docstring (#11825) @GregoryKimball
• Add developer docs for writing tests (#11199) @vyasr

🚀 New Features

• Adds an EventHandler to Java MemoryBuffer to be invoked on close (#12125) @abellina
• Support + in strings_udf (#12117) @brandon-b-miller
• Support upper and lower in strings_udf (#12099) @brandon-b-miller
• Add wheel builds (#12096) @vyasr
• Allow setting malloc heap size in string udfs (#12094) @brandon-b-miller
• Support strip, lstrip, and rstrip in strings_udf (#12091) @brandon-b-miller
• Mark nvcomp zstd compression stable (#12059) @jbrennan333
• Add debug-only onAllocated/onDeallocated to RmmEventHandler (#12054) @abellina
• Enable building against the libarrow contained in pyarrow (#12034) @vyasr
• Add strings like jni and native method (#12032) @cindyyuanjiang
• Cleanup common parsing code in JSON, CSV reader (#12022) @karthikeyann
• byte_range support for JSON Lines format (#12017) @karthikeyann
• Minor cleanup of root CMakeLists.txt for better organization (#11988) @robertmaynard
• Add inplace arithmetic operators to MaskedType (#11987) @brandon-b-miller
• Implement JNI for chunked Parquet reader (#11961) @ttnghia
• Add method argument to DataFrame.quantile (#11957) @rjzamora
• Add gpu memory watermark apis to JNI (#11950) @abellina
• Adds retryCount to RmmEventHandler.onAllocFailure (#11940) @abellina
• Enable returning string data from UDFs used through apply (#11933) @brandon-b-miller
• Switch over to rapids-cmake patches for thrust (#11921) @robertmaynard
• Add strings udf C++ classes and functions for phase II (#11912) @davidwendt
• Trim quotes for non-string values in nested json parsing (#11898) @karthikeyann
• Enable CEC for strings_udf (#11884) @brandon-b-miller
• ArrowIPCTableWriter writes en empty batch in the case of an empty table. (#11883) @firestarman
• Implement chunked Parquet reader (#11867) @ttnghia
• Add read_orc_metadata to libcudf (#11815) @vuule
• Support nested types as groupby keys in libcudf (#11792) @PointKernel
• Adding feature Truncate to DataFrame and Series (#11435) @VamsiTallam95

🛠️ Improvements

• Reduce number of tests marked spilling (#12197) @madsbk
• Pin dask and distributed for release (#12165) @galipremsagar
• Don't rely on GNU find in headers_test.sh (#12164) @wence-
• Update cp.clip call (#12148) @quasiben
• Enable automatic column projection in groupby().agg (#12124) @rjzamora
• Refactor purge_nonempty_nulls (#12111) @ttnghia
• Create an int8 column in read_csv when all elements are missing (#12110) @vuule
• Spilling to host memory (#12106) @madsbk
• First pass of pd.read_orc changes in tests (#12103) @galipremsagar
• Expose engine argument in dask_cudf.read_json (#12101) @rjzamora
• Remove CUDA 10 compatibility code. (#12088) @bdice
• Move and update dask nigthly install in CI (#12082) @galipremsagar
• Throw an error when libcudf is built without cuFile and LIBCUDF_CUFILE_POLICY is set to "ALWAYS" (#12080) @vuule
• Remove macros that inspect the contents of exceptions (#12076) @vyasr
• Fix ingest_raw_data performance issue in Nested JSON reader due to RVO (#12070) @karthikeyann
• Remove overflow error during decimal binops (#12063) @galipremsagar
• Change cudf::detail::tdigest to cudf::tdigest::detail (#12050) @davidwendt
• Fix quantile gtests coded in namespace cudf::test (#12049) @davidwendt
• Add support for DataFrame.from_dict`to_dictandSeries.to_dict` (#12048) @galipremsagar
• Refactor Parquet reader (#12046) @ttnghia
• Forward merge 22.10 into 22.12 (#12045) @vyasr
• Standardize newlines at ends of files. (#12042) @bdice
• Trim trailing whitespace from all files. (#12041) @bdice
• Use nosync policy in gather and scatter implementations. (#12038) @bdice
• Remove smart quotes from all docstrings. (#12035) @bdice
• Update cuda-python dependency to 11.7.1 (#12030) @galipremsagar
• Add cython-lint to pre-commit checks. (#12020) @bdice
• Use pragma once (#12019) @bdice
• New GHA to add issues/prs to project board (#12016) @jarmak-nv
• Add DataFrame.pivot_table. (#12015) @bdice
• Rollback of DeviceBufferLike (#12009) @madsbk
• Remove default parameters for nvtext::detail functions (#12007) @davidwendt
• Remove default parameters for cudf::dictionary::detail functions (#12006) @davidwendt
• Remove unused managed_allocator (#12005) @vyasr
• Remove default parameters for cudf::strings::detail functions (#12003) @davidwendt
• Remove unnecessary code from dask-cudf _Frame (#12001) @rjzamora
• Ignore python docs build artifacts (#12000) @galipremsagar
• Use rapids-cmake for google benchmark. (#11997) @vyasr
• Leverage rapids_cython for more automated RPATH handling (#11996) @vyasr
• Remove stale labeler (#11995) @raydouglass
• Move protobuf compilation to CMake (#11986) @vyasr
• Replace most of preprocessor usage in nvcomp adapter with constexpr (#11980) @vuule
• Add missing noexcepts to column_in_metadata methods (#11973) @vyasr
• Pass column names to write_csv instead of table_metadata pointer (#11972) @vuule
• Accelerate libcudf segmented sort with CUB segmented sort (#11969) @davidwendt
• Feature/remove default streams (#11967) @vyasr
• Add pool memory resource to libcudf basic example (#11966) @davidwendt
• Fix some libcudf calls to cudf::detail::gather (#11963) @davidwendt
• Accept const refs instead of const unique_ptr refs in reduce and scan APIs. (#11960) @vyasr
• Add deprecation warning for set_allocator. (#11958) @vyasr
• Fix lists and structs gtests coded in namespace cudf::test (#11956) @davidwendt
• Add full page indexes to Parquet writer benchmarks (#11955) @etseidl
• Use gather-based strings factory in cudf::strings::strip (#11954) @davidwendt
• Default to equal NaNs in make_merge_sets_aggregation. (#11952) @bdice
• Add strip_delimiters option to read_text (#11946) @upsj
• Refactor multibyte_split output_builder (#11945) @upsj
• Remove validation that requires introspection (#11938) @vyasr
• Add .str.find_multiple API (#11928) @galipremsagar
• Add regex_program class for use with all regex APIs (#11927) @davidwendt
• Enable backend dispatching for Dask-DataFrame creation (#11920) @rjzamora
• Performance improvement in JSON Tree traversal (#11919) @karthikeyann
• Fix some gtests incorrectly coded in namespace cudf::test (part I) (#11917) @davidwendt
• Refactor pad/zfill functions for reuse with strings udf (#11914) @davidwendt
• Add nanosecond & microsecond to DatetimeProperties (#11911) @galipremsagar
• Pin mimesis version in setup.py. (#11906) @bdice
• Error on ListColumn or any new unsupported column in cudf.Index (#11902) @galipremsagar
• Add thrust output iterator fix (1805) to thrust.patch (#11900) @davidwendt
• Relax codecov threshold diff (#11899) @galipremsagar
• Use public APIs in STREAM_COMPACTION_NVBENCH (#11892) @GregoryKimball
• Add coverage for string UDF tests. (#11891) @vyasr
• Provide data_chunk_source wrapper for datasource (#11886) @upsj
• Handle multibyte_split byte_range out-of-bounds offsets on host (#11885) @upsj
• Add tests ensuring that cudf's default stream is always used (#11875) @vyasr
• Change expect_strings_empty into expect_column_empty libcudf test utility (#11873) @davidwendt
• Add ngroup (#11871) @shwina
• Reduce memory usage in nested JSON parser - tree generation (#11864) @karthikeyann
• Unpin dask and distributed for development (#11859) @galipremsagar
• Remove unused includes for table/row_operators (#11857) @GregoryKimball
• Use conda-forge's pyorc (#11855) @jakirkham
• Add libcudf strings examples (#11849) @davidwendt
• Remove cudf_io namespace alias (#11827) @vuule
• Test/remove thrust vector usage (#11813) @vyasr
• Add BGZIP reader to python read_text (#11802) @upsj
• Merge branch-22.10 into branch-22.12 (#11801) @davidwendt
• Fix compile warning from CUDF_FUNC_RANGE in a member function (#11798) @davidwendt
• Update cudf JNI version to 22.12.0-SNAPSHOT (#11764) @pxLi
• Update flake8 to 5.0.4 and use flake8-force to check Cython. (#11736) @bdice
• Add BGZIP multibyte_split benchmark (#11723) @upsj
• Bifurcate Dependency Lists (#11674) @bdice
• Default to equal NaNs in make_collect_set_aggregation. (#11621) @bdice
• Conform "bench_isin" to match generator column names (#11549) @GregoryKimball
• Removing int8 column option from parquet byte_array writing (#11539) @hyperbolic2346
• Add checks for HLG layers in dask-cudf groupby tests (#10853) @charlesbluca
• part1: Simplify BaseIndex to an abstract class (#10389) @skirui-source
• Make all nvcc warnings into errors (#8916) @trxcllnt

🔗 Links

• Development Branch
• Compare with main branch

🚨 Breaking Changes

• Disable Zstandard decompression on nvCOMP 2.4 and Pascal GPus (#11856) @vuule
• Disable nvCOMP DEFLATE integration (#11811) @vuule
• Fix return type of Index.isna & Index.notna (#11769) @galipremsagar
• Remove kwargs in read_csv & to_csv (#11762) @galipremsagar
• Fix cudf::partition* APIs that do not return offsets for empty output table (#11709) @ttnghia
• Fix regex negated classes to not automatically include new-lines (#11644) @davidwendt
• Update zfill to match Python output (#11634) @davidwendt
• Upgrade pandas to 1.5 (#11617) @galipremsagar
• Change default value of ordered to False in CategoricalDtype (#11604) @galipremsagar
• Move cudf::strings::findall_record to cudf::strings::findall (#11575) @davidwendt
• Adding optional parquet reader schema (#11524) @hyperbolic2346
• Deprecate skiprows and num_rows in read_orc (#11522) @galipremsagar
• Remove support for skip_rows / num_rows options in the parquet reader. (#11503) @nvdbaranec
• Drop support for skiprows and num_rows in cudf.read_parquet (#11480) @galipremsagar
• Disable Arrow S3 support by default. (#11470) @bdice
• Convert thrust::optional usages to std::optional (#11455) @robertmaynard
• Remove unused is_struct trait. (#11450) @bdice
• Refactor the Buffer class (#11447) @madsbk
• Return empty dataframe when reading an ORC file using empty columns option (#11446) @vuule
• Refactor pad_side and strip_type enums into side_type enum (#11438) @davidwendt
• Remove HASH_SERIAL_MURMUR3 / serial32BitMurmurHash3 (#11383) @bdice
• Use the new JSON parser when the experimental reader is selected (#11364) @vuule
• Remove deprecated Series.applymap. (#11031) @bdice
• Remove deprecated expand parameter from str.findall. (#11030) @bdice

🐛 Bug Fixes

• Force using old fmt in nvbench. (#12064) @vyasr
• Update cuda-python dependency to 11.7.1 (#11994) @shwina
• Fixes bug in temporary decompression space estimation before calling nvcomp (#11879) @abellina
• Handle ptx file paths during strings_udf import (#11862) @galipremsagar
• Disable Zstandard decompression on nvCOMP 2.4 and Pascal GPus (#11856) @vuule
• Reset strings_udf CEC and solve several related issues (#11846) @brandon-b-miller
• Fix bug in new shuffle-based groupby implementation (#11836) @rjzamora
• Fix is_valid checks in Scalar._binaryop (#11818) @wence-
• Fix operator NotImplemented issue with numpy (#11816) @galipremsagar
• Disable nvCOMP DEFLATE integration (#11811) @vuule
• Build strings_udf package with other python packages in nightlies (#11808) @brandon-b-miller
• Revert problematic shuffle=explicit-comms changes (#11803) @rjzamora
• Fix regex out-of-bounds write in strided rows logic (#11797) @davidwendt
• Build cudf locally before building strings_udf conda packages in CI (#11785) @brandon-b-miller
• Fix an issue in cudf::row_bit_count involving structs and lists at multiple levels. (#11779) @nvdbaranec
• Fix return type of Index.isna & Index.notna (#11769) @galipremsagar
• Fix issue with set-item incase of list and struct types (#11760) @galipremsagar
• Ensure all libcudf APIs run on cudf's default stream (#11759) @vyasr
• Resolve dask_cudf failures caused by upstream groupby changes (#11755) @rjzamora
• Fix ORC string sum statistics (#11740) @vuule
• Add strings_udf package for python 3.9 (#11730) @brandon-b-miller
• Ensure that all tests launch kernels on cudf's default stream (#11726) @vyasr
• Don't assume stream is a compile-time constant expression (#11725) @vyasr
• Fix get_thrust.cmake format at patch command (#11715) @davidwendt
• Fix cudf::partition* APIs that do not return offsets for empty output table (#11709) @ttnghia
• Fix cudf::lists::sort_lists for NaN and Infinity values (#11703) @davidwendt
• Modify ORC reader timestamp parsing to match the apache reader behavior (#11699) @vuule
• Fix DataFrame.from_arrow to preserve type metadata (#11698) @galipremsagar
• Fix compile error due to missing header (#11697) @ttnghia
• Default to Snappy compression in to_orc when using cuDF or Dask (#11690) @vuule
• Fix an issue related to Multindex when group_keys=True (#11689) @galipremsagar
• Transfer correct dtype to exploded column (#11687) @wence-
• Ignore protobuf generated files in mypy checks (#11685) @galipremsagar
• Maintain the index name after .loc (#11677) @shwina
• Fix issue with extracting nested column data & dtype preservation (#11671) @galipremsagar
• Ensure that all cudf tests and benchmarks are conda env aware (#11666) @robertmaynard
• Update to Thrust 1.17.2 to fix cub ODR issues (#11665) @robertmaynard
• Fix multi-file remote datasource bug (#11655) @rjzamora
• Fix invalid regex quantifier check to not include alternation (#11654) @davidwendt
• Fix bug in device_write(): it uses an incorrect size (#11651) @madsbk
• fixes overflows in benchmarks (#11649) @elstehle
• Fix regex negated classes to not automatically include new-lines (#11644) @davidwendt
• Fix compile error in benchmark nested_json.cpp (#11637) @davidwendt
• Update zfill to match Python output (#11634) @davidwendt
• Removed converted type for INT32 and INT64 since they do not convert (#11627) @hyperbolic2346
• Fix host scalars construction of nested types (#11612) @galipremsagar
• Fix compile warning in nested_json_gpu.cu (#11607) @davidwendt
• Change default value of ordered to False in CategoricalDtype (#11604) @galipremsagar
• Preserve order if necessary when deduping categoricals internally (#11597) @brandon-b-miller
• Add is_timestamp test for leap second (60) (#11594) @davidwendt
• Fix an issue with to_arrow when column name type is not a string (#11590) @galipremsagar
• Fix exception in segmented-reduce benchmark (#11588) @davidwendt
• Fix encode/decode of negative timestamps in ORC reader/writer (#11586) @vuule
• Correct distribution data type in quantiles benchmark (#11584) @vuule
• Fix multibyte_split benchmark for host buffers (#11583) @upsj
• xfail custreamz display test for now (#11567) @shwina
• Fix JNI for TableWithMeta to use schema_info instead of column_names (#11566) @jlowe
• Reduce code duplication for dask & distributed nightly/stable installs (#11565) @galipremsagar
• Fix groupby failures in dask_cudf CI (#11561) @rjzamora
• Fix for pivot: error when 'values' is a multicharacter string (#11538) @shaswat-indian
• find_package(cudf) + arrow9 usable with cudf build directory (#11535) @robertmaynard
• Fixing crash when writing binary nested data in parquet (#11526) @hyperbolic2346
• Fix for: error when assigning a value to an empty series (#11523) @shaswat-indian
• Fix invalid results from conditional-left-anti-join in debug build (#11517) @davidwendt
• Fix cmake error after upgrading to Arrow 9 (#11513) @ttnghia
• Fix reverse binary operators acting on a host value and cudf.Scalar (#11512) @bdice
• Update parquet fuzz tests to drop support for skiprows & num_rows (#11505) @galipremsagar
• Use rapids-cmake 22.10 best practice for RAPIDS.cmake location (#11493) @robertmaynard
• Handle some zero-sized corner cases in dlpack interop (#11449) @wence-
• Return empty dataframe when reading an ORC file using empty columns option (#11446) @vuule
• libcudf c++ example updated to CPM version 0.35.3 (#11417) @robertmaynard
• Fix regex quantifier check to include capture groups (#11373) @davidwendt
• Fix read_text when byte_range is aligned with field (#11371) @upsj
• Fix to_timestamps truncated subsecond calculation (#11367) @davidwendt
• column: calculate null_count before release()ing the cudf::column (#11365) @wence-

📖 Documentation

• Update guide-to-udfs notebook (#11861) @brandon-b-miller
• Update docstring for cudf.read_text (#11799) @GregoryKimball
• Add doc section for list & struct handling (#11770) @galipremsagar
• Document that minimum required CMake version is now 3.23.1 (#11751) @robertmaynard
• Update libcudf documentation build command in DOCUMENTATION.md (#11735) @davidwendt
• Add docs for use of string data to DataFrame.apply and Series.apply and update guide to UDFs notebook (#11733) @brandon-b-miller
• Enable more Pydocstyle rules (#11582) @bdice
• Remove unused cpp/img folder (#11554) @davidwendt
• Publish C++ developer docs (#11475) @vyasr
• Fix a misalignment in cudf.get_dummies docstring (#11443) @galipremsagar
• Update contributing doc to include links to the developer guides (#11390) @davidwendt
• Fix table_view_base doxygen format (#11340) @davidwendt
• Create main developer guide for Python (#11235) @vyasr
• Add developer documentation for benchmarking (#11122) @vyasr
• cuDF error handling document (#7917) @isVoid

🚀 New Features

• Add hasNull statistic reading ability to ORC (#11747) @devavret
• Add istitle to string UDFs (#11738) @brandon-b-miller
• JSON Column creation in GPU (#11714) @karthikeyann
• Adds option to take explicit nested schema for nested JSON reader (#11682) @elstehle
• Add BGZIP data_chunk_reader (#11652) @upsj
• Support DECIMAL order-by for RANGE window functions (#11645) @mythrocks
• changing version of cmake to 3.23.3 (#11619) @hyperbolic2346
• Generate unique keys table in java JNI contiguousSplitGroups (#11614) @res-life
• Generic type casting to support the new nested JSON reader (#11613) @elstehle
• JSON tree traversal (#11610) @karthikeyann
• Add casting operators to masked UDFs (#11578) @brandon-b-miller
• Adds type inference and type conversion for leaf-columns to the nested JSON parser (#11574) @elstehle
• Add strings 'like' function (#11558) @davidwendt
• Handle hyphen as literal for regex cclass when incomplete range (#11557) @davidwendt
• Enable ZSTD compression in ORC and Parquet writers (#11551) @vuule
• Adds support for json lines format to the nested JSON reader (#11534) @elstehle
• Adding optional parquet reader schema (#11524) @hyperbolic2346
• Adds GPU implementation of JSON-token-stream to JSON-tree (#11518) @karthikeyann
• Add gdb pretty-printers for simple types (#11499) @upsj
• Add create_random_column function to the data generator (#11490) @vuule
• Add fluent API builder to data_profile (#11479) @vuule
• Adds Nested Json benchmark (#11466) @karthikeyann
• Convert thrust::optional usages to std::optional (#11455) @robertmaynard
• Python API for the future experimental JSON reader (#11426) @vuule
• Return schema info from JSON reader (#11419) @vuule
• Add regex ASCII flag support for matching builtin character classes (#11404) @davidwendt
• Truncate parquet column indexes (#11403) @etseidl
• Adds the end-to-end JSON parser implementation (#11388) @elstehle
• Use the new JSON parser when the experimental reader is selected (#11364) @vuule
• Add placeholder for the experimental JSON reader (#11334) @vuule
• Add read-only functions on string dtypes to DataFrame.apply and Series.apply (#11319) @brandon-b-miller
• Added 'crosstab' and 'pivot_table' features (#11314) @shaswat-indian
• Quickly error out when trying to build with unsupported nvcc versions (#11297) @robertmaynard
• Adds JSON tokenizer (#11264) @elstehle
• List lexicographic comparator (#11129) @devavret
• Add generic type inference for cuIO (#11121) @PointKernel
• Fully support nested types in cudf::contains (#10656) @ttnghia
• Support nested types in lists::contains (#10548) @ttnghia

🛠️ Improvements

• Pin dask and distributed for release (#11822) @galipremsagar
• Add examples for Nested JSON reader (#11814) @GregoryKimball
• Support shuffle-based groupby aggregations in dask_cudf (#11800) @rjzamora
• Update strings udf version updater script (#11772) @galipremsagar
• Remove kwargs in read_csv & to_csv (#11762) @galipremsagar
• Pass dtype param to avoid pd.Series warnings (#11761) @galipremsagar
• Enable schema_element & keep_quotes support in json reader (#11746) @galipremsagar
• Add ability to construct ListColumn when size is None (#11745) @galipremsagar
• Reduces memory requirements in JSON parser and adds bytes/s and peak memory usage to benchmarks (#11732) @elstehle
• Add missing copyright headers. (#11712) @bdice
• Fix copyright check issues in pre-commit (#11711) @bdice
• Include decimal in supported types for range window order-by columns (#11710) @mythrocks
• Disable very large column gtest for contiguous-split (#11706) @davidwendt
• Drop split_out=None test from groupby.agg (#11704) @wence-
• Use CubinLinker for CUDA Minor Version Compatibility (#11701) @gmarkall
• Add regex capture-group parameter to auto convert to non-capture groups (#11695) @davidwendt
• Add a __dataframe__ method to the protocol dataframe object (#11692) @rgommers
• Special-case multibyte_split for single-byte delimiter (#11681) @upsj
• Remove isort exclusions (#11680) @bdice
• Refactor CSV reader benchmarks with nvbench (#11678) @PointKernel
• Check conda recipe headers with pre-commit (#11669) @bdice
• Remove redundant style check for clang-format. (#11668) @bdice
• Add support for group_keys in groupby (#11659) @galipremsagar
• Fix pandoc pinning. (#11658) @bdice
• Revert removal of skip_rows / num_rows options from the Parquet reader. (#11657) @nvdbaranec
• Update git metadata (#11647) @bdice
• Call set_null_count on a returning column if null-count is known (#11646) @davidwendt
• Fix some libcudf detail calls not passing the stream variable (#11642) @davidwendt
• Update to mypy 0.971 (#11640) @wence-
• Refactor strings strip functor to details header (#11635) @davidwendt
• Fix incorrect nullCount in get_json_object (#11633) @trxcllnt
• Simplify hostdevice_vector (#11631) @upsj
• Refactor parquet writer benchmarks with nvbench (#11623) @PointKernel
• Rework contains_scalar to check nulls at runtime (#11622) @davidwendt
• Fix incorrect memory resource used in rolling temp columns (#11618) @mythrocks
• Upgrade pandas to 1.5 (#11617) @galipremsagar
• Move type-dispatcher calls from traits.hpp to traits.cpp (#11616) @davidwendt
• Refactor parquet reader benchmarks with nvbench (#11611) @PointKernel
• Forward-merge branch-22.08 to branch-22.10 (#11608) @bdice
• Use stream in Java API. (#11601) @bdice
• Refactors of public/detail APIs, CUDF_FUNC_RANGE, stream handling. (#11600) @bdice
• Improve ORC writer benchmark with nvbench (#11598) @PointKernel
• Tune multibyte_split kernel (#11587) @upsj
• Move split_utils.cuh to strings/detail (#11585) @davidwendt
• Fix warnings due to compiler regression with if constexpr (#11581) @ttnghia
• Add full 24-bit dictionary support to Parquet writer (#11580) @etseidl
• Expose "explicit-comms" option in shuffle-based dask_cudf functions (#11576) @rjzamora
• Move cudf::strings::findall_record to cudf::strings::findall (#11575) @davidwendt
• Refactor dask_cudf groupby to use apply_concat_apply (#11571) @rjzamora
• Add ability to write list(struct) columns as map type in orc writer (#11568) @galipremsagar
• Add byte_range to multibyte_split benchmark + NVBench refactor (#11562) @upsj
• JNI support for writing binary columns in parquet (#11556) @revans2
• Support additional dictionary bit widths in Parquet writer (#11547) @etseidl
• Refactor string/numeric conversion utilities (#11545) @davidwendt
• Removing unnecessary asserts in parquet tests (#11544) @hyperbolic2346
• Clean up ORC reader benchmarks with NVBench (#11543) @PointKernel
• Reuse MurmurHash3_32 in Parquet page data. (#11528) @bdice
• Add hexadecimal value separators (#11527) @bdice
• Deprecate skiprows and num_rows in read_orc (#11522) @galipremsagar
• Struct support for NULL_EQUALS binary operation (#11520) @rwlee
• Bump hadoop-common from 3.2.3 to 3.2.4 in /java (#11516) @dependabot[bot]
• Fix Feather test warning. (#11511) @bdice
• copy_range ballot_syncs to have no execution dependency (#11508) @robertmaynard
• Upgrade to arrow-9.x (#11507) @galipremsagar
• Remove support for skip_rows / num_rows options in the parquet reader. (#11503) @nvdbaranec
• Single-pass multibyte_split (#11500) @upsj
• Sanitize percentile_approx() output for empty input (#11498) @SrikarVanavasam
• Unpin dask and distributed for development (#11492) @galipremsagar
• Move SparkMurmurHash3_32 functor. (#11489) @bdice
• Refactor group_nunique.cu to use nullate::DYNAMIC for reduce-by-key functor (#11482) @davidwendt
• Drop support for skiprows and num_rows in cudf.read_parquet (#11480) @galipremsagar
• Add reduction distinct_count benchmark (#11473) @ttnghia
• Add groupby nunique aggregation benchmark (#11472) @ttnghia
• Disable Arrow S3 support by default. (#11470) @bdice
• Add groupby max aggregation benchmark (#11464) @ttnghia
• Extract Dremel encoding code from Parquet (#11461) @vyasr
• Add missing Thrust #includes. (#11457) @bdice
• Make CMake hooks verbose (#11456) @vyasr
• Control Parquet page size through Python API (#11454) @etseidl
• Add control of Parquet column index creation to python (#11453) @etseidl
• Remove unused is_struct trait. (#11450) @bdice
• Refactor the Buffer class (#11447) @madsbk
• Refactor pad_side and strip_type enums into side_type enum (#11438) @davidwendt
• Update to Thrust 1.17.0 (#11437) @bdice
• Add in JNI for parsing JSON data and getting the metadata back too. (#11431) @revans2
• Convert byte_array_view to use std::byte (#11424) @hyperbolic2346
• Deprecate unflatten_nested_columns (#11421) @SrikarVanavasam
• Remove HASH_SERIAL_MURMUR3 / serial32BitMurmurHash3 (#11383) @bdice
• Add Spark list hashing Java tests (#11379) @bdice
• Move cmake to the build section. (#11376) @vyasr
• Remove use of CUDA driver API calls from libcudf (#11370) @shwina
• Add column constructor from device_uvector&& (#11356) @SrikarVanavasam
• Remove unused custreamz thirdparty directory (#11343) @vyasr
• Update jni version to 22.10.0-SNAPSHOT (#11338) @pxLi
• Enable using upstream jitify2 (#11287) @shwina
• Cache cudf.Scalar (#11246) @shwina
• Remove deprecated Series.applymap. (#11031) @bdice
• Remove deprecated expand parameter from str.findall. (#11030) @bdice

🚨 Breaking Changes

• Disable Zstandard decompression on nvCOMP 2.4 and Pascal GPus (#11856) @vuule
• Disable nvCOMP DEFLATE integration (#11811) @vuule
• Fix return type of Index.isna & Index.notna (#11769) @galipremsagar
• Remove kwargs in read_csv & to_csv (#11762) @galipremsagar
• Fix cudf::partition* APIs that do not return offsets for empty output table (#11709) @ttnghia
• Fix regex negated classes to not automatically include new-lines (#11644) @davidwendt
• Update zfill to match Python output (#11634) @davidwendt
• Upgrade pandas to 1.5 (#11617) @galipremsagar
• Change default value of ordered to False in CategoricalDtype (#11604) @galipremsagar
• Move cudf::strings::findall_record to cudf::strings::findall (#11575) @davidwendt
• Adding optional parquet reader schema (#11524) @hyperbolic2346
• Deprecate skiprows and num_rows in read_orc (#11522) @galipremsagar
• Remove support for skip_rows / num_rows options in the parquet reader. (#11503) @nvdbaranec
• Drop support for skiprows and num_rows in cudf.read_parquet (#11480) @galipremsagar
• Disable Arrow S3 support by default. (#11470) @bdice
• Convert thrust::optional usages to std::optional (#11455) @robertmaynard
• Remove unused is_struct trait. (#11450) @bdice
• Refactor the Buffer class (#11447) @madsbk
• Return empty dataframe when reading an ORC file using empty columns option (#11446) @vuule
• Refactor pad_side and strip_type enums into side_type enum (#11438) @davidwendt
• Remove HASH_SERIAL_MURMUR3 / serial32BitMurmurHash3 (#11383) @bdice
• Use the new JSON parser when the experimental reader is selected (#11364) @vuule
• Remove deprecated Series.applymap. (#11031) @bdice
• Remove deprecated expand parameter from str.findall. (#11030) @bdice

🐛 Bug Fixes

• Update cuda-python dependency to 11.7.1 (#11994) @shwina
• Fixes bug in temporary decompression space estimation before calling nvcomp (#11879) @abellina
• Handle ptx file paths during strings_udf import (#11862) @galipremsagar
• Disable Zstandard decompression on nvCOMP 2.4 and Pascal GPus (#11856) @vuule
• Reset strings_udf CEC and solve several related issues (#11846) @brandon-b-miller
• Fix bug in new shuffle-based groupby implementation (#11836) @rjzamora
• Fix is_valid checks in Scalar._binaryop (#11818) @wence-
• Fix operator NotImplemented issue with numpy (#11816) @galipremsagar
• Disable nvCOMP DEFLATE integration (#11811) @vuule
• Build strings_udf package with other python packages in nightlies (#11808) @brandon-b-miller
• Revert problematic shuffle=explicit-comms changes (#11803) @rjzamora
• Fix regex out-of-bounds write in strided rows logic (#11797) @davidwendt
• Build cudf locally before building strings_udf conda packages in CI (#11785) @brandon-b-miller
• Fix an issue in cudf::row_bit_count involving structs and lists at multiple levels. (#11779) @nvdbaranec
• Fix return type of Index.isna & Index.notna (#11769) @galipremsagar
• Fix issue with set-item incase of list and struct types (#11760) @galipremsagar
• Ensure all libcudf APIs run on cudf's default stream (#11759) @vyasr
• Resolve dask_cudf failures caused by upstream groupby changes (#11755) @rjzamora
• Fix ORC string sum statistics (#11740) @vuule
• Add strings_udf package for python 3.9 (#11730) @brandon-b-miller
• Ensure that all tests launch kernels on cudf's default stream (#11726) @vyasr
• Don't assume stream is a compile-time constant expression (#11725) @vyasr
• Fix get_thrust.cmake format at patch command (#11715) @davidwendt
• Fix cudf::partition* APIs that do not return offsets for empty output table (#11709) @ttnghia
• Fix cudf::lists::sort_lists for NaN and Infinity values (#11703) @davidwendt
• Modify ORC reader timestamp parsing to match the apache reader behavior (#11699) @vuule
• Fix DataFrame.from_arrow to preserve type metadata (#11698) @galipremsagar
• Fix compile error due to missing header (#11697) @ttnghia
• Default to Snappy compression in to_orc when using cuDF or Dask (#11690) @vuule
• Fix an issue related to Multindex when group_keys=True (#11689) @galipremsagar
• Transfer correct dtype to exploded column (#11687) @wence-
• Ignore protobuf generated files in mypy checks (#11685) @galipremsagar
• Maintain the index name after .loc (#11677) @shwina
• Fix issue with extracting nested column data & dtype preservation (#11671) @galipremsagar
• Ensure that all cudf tests and benchmarks are conda env aware (#11666) @robertmaynard
• Update to Thrust 1.17.2 to fix cub ODR issues (#11665) @robertmaynard
• Fix multi-file remote datasource bug (#11655) @rjzamora
• Fix invalid regex quantifier check to not include alternation (#11654) @davidwendt
• Fix bug in device_write(): it uses an incorrect size (#11651) @madsbk
• fixes overflows in benchmarks (#11649) @elstehle
• Fix regex negated classes to not automatically include new-lines (#11644) @davidwendt
• Fix compile error in benchmark nested_json.cpp (#11637) @davidwendt
• Update zfill to match Python output (#11634) @davidwendt
• Removed converted type for INT32 and INT64 since they do not convert (#11627) @hyperbolic2346
• Fix host scalars construction of nested types (#11612) @galipremsagar
• Fix compile warning in nested_json_gpu.cu (#11607) @davidwendt
• Change default value of ordered to False in CategoricalDtype (#11604) @galipremsagar
• Preserve order if necessary when deduping categoricals internally (#11597) @brandon-b-miller
• Add is_timestamp test for leap second (60) (#11594) @davidwendt
• Fix an issue with to_arrow when column name type is not a string (#11590) @galipremsagar
• Fix exception in segmented-reduce benchmark (#11588) @davidwendt
• Fix encode/decode of negative timestamps in ORC reader/writer (#11586) @vuule
• Correct distribution data type in quantiles benchmark (#11584) @vuule
• Fix multibyte_split benchmark for host buffers (#11583) @upsj
• xfail custreamz display test for now (#11567) @shwina
• Fix JNI for TableWithMeta to use schema_info instead of column_names (#11566) @jlowe
• Reduce code duplication for dask & distributed nightly/stable installs (#11565) @galipremsagar
• Fix groupby failures in dask_cudf CI (#11561) @rjzamora
• Fix for pivot: error when 'values' is a multicharacter string (#11538) @shaswat-indian
• find_package(cudf) + arrow9 usable with cudf build directory (#11535) @robertmaynard
• Fixing crash when writing binary nested data in parquet (#11526) @hyperbolic2346
• Fix for: error when assigning a value to an empty series (#11523) @shaswat-indian
• Fix invalid results from conditional-left-anti-join in debug build (#11517) @davidwendt
• Fix cmake error after upgrading to Arrow 9 (#11513) @ttnghia
• Fix reverse binary operators acting on a host value and cudf.Scalar (#11512) @bdice
• Update parquet fuzz tests to drop support for skiprows & num_rows (#11505) @galipremsagar
• Use rapids-cmake 22.10 best practice for RAPIDS.cmake location (#11493) @robertmaynard
• Handle some zero-sized corner cases in dlpack interop (#11449) @wence-
• Return empty dataframe when reading an ORC file using empty columns option (#11446) @vuule
• libcudf c++ example updated to CPM version 0.35.3 (#11417) @robertmaynard
• Fix regex quantifier check to include capture groups (#11373) @davidwendt
• Fix read_text when byte_range is aligned with field (#11371) @upsj
• Fix to_timestamps truncated subsecond calculation (#11367) @davidwendt
• column: calculate null_count before release()ing the cudf::column (#11365) @wence-

📖 Documentation

• Update guide-to-udfs notebook (#11861) @brandon-b-miller
• Update docstring for cudf.read_text (#11799) @GregoryKimball
• Add doc section for list & struct handling (#11770) @galipremsagar
• Document that minimum required CMake version is now 3.23.1 (#11751) @robertmaynard
• Update libcudf documentation build command in DOCUMENTATION.md (#11735) @davidwendt
• Add docs for use of string data to DataFrame.apply and Series.apply and update guide to UDFs notebook (#11733) @brandon-b-miller
• Enable more Pydocstyle rules (#11582) @bdice
• Remove unused cpp/img folder (#11554) @davidwendt
• Publish C++ developer docs (#11475) @vyasr
• Fix a misalignment in cudf.get_dummies docstring (#11443) @galipremsagar
• Update contributing doc to include links to the developer guides (#11390) @davidwendt
• Fix table_view_base doxygen format (#11340) @davidwendt
• Create main developer guide for Python (#11235) @vyasr
• Add developer documentation for benchmarking (#11122) @vyasr
• cuDF error handling document (#7917) @isVoid

🚀 New Features

• Add hasNull statistic reading ability to ORC (#11747) @devavret
• Add istitle to string UDFs (#11738) @brandon-b-miller
• JSON Column creation in GPU (#11714) @karthikeyann
• Adds option to take explicit nested schema for nested JSON reader (#11682) @elstehle
• Add BGZIP data_chunk_reader (#11652) @upsj
• Support DECIMAL order-by for RANGE window functions (#11645) @mythrocks
• changing version of cmake to 3.23.3 (#11619) @hyperbolic2346
• Generate unique keys table in java JNI contiguousSplitGroups (#11614) @res-life
• Generic type casting to support the new nested JSON reader (#11613) @elstehle
• JSON tree traversal (#11610) @karthikeyann
• Add casting operators to masked UDFs (#11578) @brandon-b-miller
• Adds type inference and type conversion for leaf-columns to the nested JSON parser (#11574) @elstehle
• Add strings 'like' function (#11558) @davidwendt
• Handle hyphen as literal for regex cclass when incomplete range (#11557) @davidwendt
• Enable ZSTD compression in ORC and Parquet writers (#11551) @vuule
• Adds support for json lines format to the nested JSON reader (#11534) @elstehle
• Adding optional parquet reader schema (#11524) @hyperbolic2346
• Adds GPU implementation of JSON-token-stream to JSON-tree (#11518) @karthikeyann
• Add gdb pretty-printers for simple types (#11499) @upsj
• Add create_random_column function to the data generator (#11490) @vuule
• Add fluent API builder to data_profile (#11479) @vuule
• Adds Nested Json benchmark (#11466) @karthikeyann
• Convert thrust::optional usages to std::optional (#11455) @robertmaynard
• Python API for the future experimental JSON reader (#11426) @vuule
• Return schema info from JSON reader (#11419) @vuule
• Add regex ASCII flag support for matching builtin character classes (#11404) @davidwendt
• Truncate parquet column indexes (#11403) @etseidl
• Adds the end-to-end JSON parser implementation (#11388) @elstehle
• Use the new JSON parser when the experimental reader is selected (#11364) @vuule
• Add placeholder for the experimental JSON reader (#11334) @vuule
• Add read-only functions on string dtypes to DataFrame.apply and Series.apply (#11319) @brandon-b-miller
• Added 'crosstab' and 'pivot_table' features (#11314) @shaswat-indian
• Quickly error out when trying to build with unsupported nvcc versions (#11297) @robertmaynard
• Adds JSON tokenizer (#11264) @elstehle
• List lexicographic comparator (#11129) @devavret
• Add generic type inference for cuIO (#11121) @PointKernel
• Fully support nested types in cudf::contains (#10656) @ttnghia
• Support nested types in lists::contains (#10548) @ttnghia

🛠️ Improvements

• Pin dask and distributed for release (#11822) @galipremsagar
• Add examples for Nested JSON reader (#11814) @GregoryKimball
• Support shuffle-based groupby aggregations in dask_cudf (#11800) @rjzamora
• Update strings udf version updater script (#11772) @galipremsagar
• Remove kwargs in read_csv & to_csv (#11762) @galipremsagar
• Pass dtype param to avoid pd.Series warnings (#11761) @galipremsagar
• Enable schema_element & keep_quotes support in json reader (#11746) @galipremsagar
• Add ability to construct ListColumn when size is None (#11745) @galipremsagar
• Reduces memory requirements in JSON parser and adds bytes/s and peak memory usage to benchmarks (#11732) @elstehle
• Add missing copyright headers. (#11712) @bdice
• Fix copyright check issues in pre-commit (#11711) @bdice
• Include decimal in supported types for range window order-by columns (#11710) @mythrocks
• Disable very large column gtest for contiguous-split (#11706) @davidwendt
• Drop split_out=None test from groupby.agg (#11704) @wence-
• Use CubinLinker for CUDA Minor Version Compatibility (#11701) @gmarkall
• Add regex capture-group parameter to auto convert to non-capture groups (#11695) @davidwendt
• Add a __dataframe__ method to the protocol dataframe object (#11692) @rgommers
• Special-case multibyte_split for single-byte delimiter (#11681) @upsj
• Remove isort exclusions (#11680) @bdice
• Refactor CSV reader benchmarks with nvbench (#11678) @PointKernel
• Check conda recipe headers with pre-commit (#11669) @bdice
• Remove redundant style check for clang-format. (#11668) @bdice
• Add support for group_keys in groupby (#11659) @galipremsagar
• Fix pandoc pinning. (#11658) @bdice
• Revert removal of skip_rows / num_rows options from the Parquet reader. (#11657) @nvdbaranec
• Update git metadata (#11647) @bdice
• Call set_null_count on a returning column if null-count is known (#11646) @davidwendt
• Fix some libcudf detail calls not passing the stream variable (#11642) @davidwendt
• Update to mypy 0.971 (#11640) @wence-
• Refactor strings strip functor to details header (#11635) @davidwendt
• Fix incorrect nullCount in get_json_object (#11633) @trxcllnt
• Simplify hostdevice_vector (#11631) @upsj
• Refactor parquet writer benchmarks with nvbench (#11623) @PointKernel
• Rework contains_scalar to check nulls at runtime (#11622) @davidwendt
• Fix incorrect memory resource used in rolling temp columns (#11618) @mythrocks
• Upgrade pandas to 1.5 (#11617) @galipremsagar
• Move type-dispatcher calls from traits.hpp to traits.cpp (#11616) @davidwendt
• Refactor parquet reader benchmarks with nvbench (#11611) @PointKernel
• Forward-merge branch-22.08 to branch-22.10 (#11608) @bdice
• Use stream in Java API. (#11601) @bdice
• Refactors of public/detail APIs, CUDF_FUNC_RANGE, stream handling. (#11600) @bdice
• Improve ORC writer benchmark with nvbench (#11598) @PointKernel
• Tune multibyte_split kernel (#11587) @upsj
• Move split_utils.cuh to strings/detail (#11585) @davidwendt
• Fix warnings due to compiler regression with if constexpr (#11581) @ttnghia
• Add full 24-bit dictionary support to Parquet writer (#11580) @etseidl
• Expose "explicit-comms" option in shuffle-based dask_cudf functions (#11576) @rjzamora
• Move cudf::strings::findall_record to cudf::strings::findall (#11575) @davidwendt
• Refactor dask_cudf groupby to use apply_concat_apply (#11571) @rjzamora
• Add ability to write list(struct) columns as map type in orc writer (#11568) @galipremsagar
• Add byte_range to multibyte_split benchmark + NVBench refactor (#11562) @upsj
• JNI support for writing binary columns in parquet (#11556) @revans2
• Support additional dictionary bit widths in Parquet writer (#11547) @etseidl
• Refactor string/numeric conversion utilities (#11545) @davidwendt
• Removing unnecessary asserts in parquet tests (#11544) @hyperbolic2346
• Clean up ORC reader benchmarks with NVBench (#11543) @PointKernel
• Reuse MurmurHash3_32 in Parquet page data. (#11528) @bdice
• Add hexadecimal value separators (#11527) @bdice
• Deprecate skiprows and num_rows in read_orc (#11522) @galipremsagar
• Struct support for NULL_EQUALS binary operation (#11520) @rwlee
• Bump hadoop-common from 3.2.3 to 3.2.4 in /java (#11516) @dependabot[bot]
• Fix Feather test warning. (#11511) @bdice
• copy_range ballot_syncs to have no execution dependency (#11508) @robertmaynard
• Upgrade to arrow-9.x (#11507) @galipremsagar
• Remove support for skip_rows / num_rows options in the parquet reader. (#11503) @nvdbaranec
• Single-pass multibyte_split (#11500) @upsj
• Sanitize percentile_approx() output for empty input (#11498) @SrikarVanavasam
• Unpin dask and distributed for development (#11492) @galipremsagar
• Move SparkMurmurHash3_32 functor. (#11489) @bdice
• Refactor group_nunique.cu to use nullate::DYNAMIC for reduce-by-key functor (#11482) @davidwendt
• Drop support for skiprows and num_rows in cudf.read_parquet (#11480) @galipremsagar
• Add reduction distinct_count benchmark (#11473) @ttnghia
• Add groupby nunique aggregation benchmark (#11472) @ttnghia
• Disable Arrow S3 support by default. (#11470) @bdice
• Add groupby max aggregation benchmark (#11464) @ttnghia
• Extract Dremel encoding code from Parquet (#11461) @vyasr
• Add missing Thrust #includes. (#11457) @bdice
• Make CMake hooks verbose (#11456) @vyasr
• Control Parquet page size through Python API (#11454) @etseidl
• Add control of Parquet column index creation to python (#11453) @etseidl
• Remove unused is_struct trait. (#11450) @bdice
• Refactor the Buffer class (#11447) @madsbk
• Refactor pad_side and strip_type enums into side_type enum (#11438) @davidwendt
• Update to Thrust 1.17.0 (#11437) @bdice
• Add in JNI for parsing JSON data and getting the metadata back too. (#11431) @revans2
• Convert byte_array_view to use std::byte (#11424) @hyperbolic2346
• Deprecate unflatten_nested_columns (#11421) @SrikarVanavasam
• Remove HASH_SERIAL_MURMUR3 / serial32BitMurmurHash3 (#11383) @bdice
• Add Spark list hashing Java tests (#11379) @bdice
• Move cmake to the build section. (#11376) @vyasr
• Remove use of CUDA driver API calls from libcudf (#11370) @shwina
• Add column constructor from device_uvector&& (#11356) @SrikarVanavasam
• Remove unused custreamz thirdparty directory (#11343) @vyasr
• Update jni version to 22.10.0-SNAPSHOT (#11338) @pxLi
• Enable using upstream jitify2 (#11287) @shwina
• Cache cudf.Scalar (#11246) @shwina
• Remove deprecated Series.applymap. (#11031) @bdice
• Remove deprecated expand parameter from str.findall. (#11030) @bdice

🚨 Breaking Changes

• Disable Zstandard decompression on nvCOMP 2.4 and Pascal GPus (#11856) @vuule
• Disable nvCOMP DEFLATE integration (#11811) @vuule
• Fix return type of Index.isna & Index.notna (#11769) @galipremsagar
• Remove kwargs in read_csv & to_csv (#11762) @galipremsagar
• Fix cudf::partition* APIs that do not return offsets for empty output table (#11709) @ttnghia
• Fix regex negated classes to not automatically include new-lines (#11644) @davidwendt
• Update zfill to match Python output (#11634) @davidwendt
• Upgrade pandas to 1.5 (#11617) @galipremsagar
• Change default value of ordered to False in CategoricalDtype (#11604) @galipremsagar
• Move cudf::strings::findall_record to cudf::strings::findall (#11575) @davidwendt
• Adding optional parquet reader schema (#11524) @hyperbolic2346
• Deprecate skiprows and num_rows in read_orc (#11522) @galipremsagar
• Remove support for skip_rows / num_rows options in the parquet reader. (#11503) @nvdbaranec
• Drop support for skiprows and num_rows in cudf.read_parquet (#11480) @galipremsagar
• Disable Arrow S3 support by default. (#11470) @bdice
• Convert thrust::optional usages to std::optional (#11455) @robertmaynard
• Remove unused is_struct trait. (#11450) @bdice
• Refactor the Buffer class (#11447) @madsbk
• Return empty dataframe when reading an ORC file using empty columns option (#11446) @vuule
• Refactor pad_side and strip_type enums into side_type enum (#11438) @davidwendt
• Remove HASH_SERIAL_MURMUR3 / serial32BitMurmurHash3 (#11383) @bdice
• Use the new JSON parser when the experimental reader is selected (#11364) @vuule
• Remove deprecated Series.applymap. (#11031) @bdice
• Remove deprecated expand parameter from str.findall. (#11030) @bdice

🐛 Bug Fixes

• Fixes bug in temporary decompression space estimation before calling nvcomp (#11879) @abellina
• Handle ptx file paths during strings_udf import (#11862) @galipremsagar
• Disable Zstandard decompression on nvCOMP 2.4 and Pascal GPus (#11856) @vuule
• Reset strings_udf CEC and solve several related issues (#11846) @brandon-b-miller
• Fix bug in new shuffle-based groupby implementation (#11836) @rjzamora
• Fix is_valid checks in Scalar._binaryop (#11818) @wence-
• Fix operator NotImplemented issue with numpy (#11816) @galipremsagar
• Disable nvCOMP DEFLATE integration (#11811) @vuule
• Build strings_udf package with other python packages in nightlies (#11808) @brandon-b-miller
• Revert problematic shuffle=explicit-comms changes (#11803) @rjzamora
• Fix regex out-of-bounds write in strided rows logic (#11797) @davidwendt
• Build cudf locally before building strings_udf conda packages in CI (#11785) @brandon-b-miller
• Fix an issue in cudf::row_bit_count involving structs and lists at multiple levels. (#11779) @nvdbaranec
• Fix return type of Index.isna & Index.notna (#11769) @galipremsagar
• Fix issue with set-item incase of list and struct types (#11760) @galipremsagar
• Ensure all libcudf APIs run on cudf's default stream (#11759) @vyasr
• Resolve dask_cudf failures caused by upstream groupby changes (#11755) @rjzamora
• Fix ORC string sum statistics (#11740) @vuule
• Add strings_udf package for python 3.9 (#11730) @brandon-b-miller
• Ensure that all tests launch kernels on cudf's default stream (#11726) @vyasr
• Don't assume stream is a compile-time constant expression (#11725) @vyasr
• Fix get_thrust.cmake format at patch command (#11715) @davidwendt
• Fix cudf::partition* APIs that do not return offsets for empty output table (#11709) @ttnghia
• Fix cudf::lists::sort_lists for NaN and Infinity values (#11703) @davidwendt
• Modify ORC reader timestamp parsing to match the apache reader behavior (#11699) @vuule
• Fix DataFrame.from_arrow to preserve type metadata (#11698) @galipremsagar
• Fix compile error due to missing header (#11697) @ttnghia
• Default to Snappy compression in to_orc when using cuDF or Dask (#11690) @vuule
• Fix an issue related to Multindex when group_keys=True (#11689) @galipremsagar
• Transfer correct dtype to exploded column (#11687) @wence-
• Ignore protobuf generated files in mypy checks (#11685) @galipremsagar
• Maintain the index name after .loc (#11677) @shwina
• Fix issue with extracting nested column data & dtype preservation (#11671) @galipremsagar
• Ensure that all cudf tests and benchmarks are conda env aware (#11666) @robertmaynard
• Update to Thrust 1.17.2 to fix cub ODR issues (#11665) @robertmaynard
• Fix multi-file remote datasource bug (#11655) @rjzamora
• Fix invalid regex quantifier check to not include alternation (#11654) @davidwendt
• Fix bug in device_write(): it uses an incorrect size (#11651) @madsbk
• fixes overflows in benchmarks (#11649) @elstehle
• Fix regex negated classes to not automatically include new-lines (#11644) @davidwendt
• Fix compile error in benchmark nested_json.cpp (#11637) @davidwendt
• Update zfill to match Python output (#11634) @davidwendt
• Removed converted type for INT32 and INT64 since they do not convert (#11627) @hyperbolic2346
• Fix host scalars construction of nested types (#11612) @galipremsagar
• Fix compile warning in nested_json_gpu.cu (#11607) @davidwendt
• Change default value of ordered to False in CategoricalDtype (#11604) @galipremsagar
• Preserve order if necessary when deduping categoricals internally (#11597) @brandon-b-miller
• Add is_timestamp test for leap second (60) (#11594) @davidwendt
• Fix an issue with to_arrow when column name type is not a string (#11590) @galipremsagar
• Fix exception in segmented-reduce benchmark (#11588) @davidwendt
• Fix encode/decode of negative timestamps in ORC reader/writer (#11586) @vuule
• Correct distribution data type in quantiles benchmark (#11584) @vuule
• Fix multibyte_split benchmark for host buffers (#11583) @upsj
• xfail custreamz display test for now (#11567) @shwina
• Fix JNI for TableWithMeta to use schema_info instead of column_names (#11566) @jlowe
• Reduce code duplication for dask & distributed nightly/stable installs (#11565) @galipremsagar
• Fix groupby failures in dask_cudf CI (#11561) @rjzamora
• Fix for pivot: error when 'values' is a multicharacter string (#11538) @shaswat-indian
• find_package(cudf) + arrow9 usable with cudf build directory (#11535) @robertmaynard
• Fixing crash when writing binary nested data in parquet (#11526) @hyperbolic2346
• Fix for: error when assigning a value to an empty series (#11523) @shaswat-indian
• Fix invalid results from conditional-left-anti-join in debug build (#11517) @davidwendt
• Fix cmake error after upgrading to Arrow 9 (#11513) @ttnghia
• Fix reverse binary operators acting on a host value and cudf.Scalar (#11512) @bdice
• Update parquet fuzz tests to drop support for skiprows & num_rows (#11505) @galipremsagar
• Use rapids-cmake 22.10 best practice for RAPIDS.cmake location (#11493) @robertmaynard
• Handle some zero-sized corner cases in dlpack interop (#11449) @wence-
• Return empty dataframe when reading an ORC file using empty columns option (#11446) @vuule
• libcudf c++ example updated to CPM version 0.35.3 (#11417) @robertmaynard
• Fix regex quantifier check to include capture groups (#11373) @davidwendt
• Fix read_text when byte_range is aligned with field (#11371) @upsj
• Fix to_timestamps truncated subsecond calculation (#11367) @davidwendt
• column: calculate null_count before release()ing the cudf::column (#11365) @wence-

📖 Documentation

• Update guide-to-udfs notebook (#11861) @brandon-b-miller
• Update docstring for cudf.read_text (#11799) @GregoryKimball
• Add doc section for list & struct handling (#11770) @galipremsagar
• Document that minimum required CMake version is now 3.23.1 (#11751) @robertmaynard
• Update libcudf documentation build command in DOCUMENTATION.md (#11735) @davidwendt
• Add docs for use of string data to DataFrame.apply and Series.apply and update guide to UDFs notebook (#11733) @brandon-b-miller
• Enable more Pydocstyle rules (#11582) @bdice
• Remove unused cpp/img folder (#11554) @davidwendt
• Publish C++ developer docs (#11475) @vyasr
• Fix a misalignment in cudf.get_dummies docstring (#11443) @galipremsagar
• Update contributing doc to include links to the developer guides (#11390) @davidwendt
• Fix table_view_base doxygen format (#11340) @davidwendt
• Create main developer guide for Python (#11235) @vyasr
• Add developer documentation for benchmarking (#11122) @vyasr
• cuDF error handling document (#7917) @isVoid

🚀 New Features

• Add hasNull statistic reading ability to ORC (#11747) @devavret
• Add istitle to string UDFs (#11738) @brandon-b-miller
• JSON Column creation in GPU (#11714) @karthikeyann
• Adds option to take explicit nested schema for nested JSON reader (#11682) @elstehle
• Add BGZIP data_chunk_reader (#11652) @upsj
• Support DECIMAL order-by for RANGE window functions (#11645) @mythrocks
• changing version of cmake to 3.23.3 (#11619) @hyperbolic2346
• Generate unique keys table in java JNI contiguousSplitGroups (#11614) @res-life
• Generic type casting to support the new nested JSON reader (#11613) @elstehle
• JSON tree traversal (#11610) @karthikeyann
• Add casting operators to masked UDFs (#11578) @brandon-b-miller
• Adds type inference and type conversion for leaf-columns to the nested JSON parser (#11574) @elstehle
• Add strings 'like' function (#11558) @davidwendt
• Handle hyphen as literal for regex cclass when incomplete range (#11557) @davidwendt
• Enable ZSTD compression in ORC and Parquet writers (#11551) @vuule
• Adds support for json lines format to the nested JSON reader (#11534) @elstehle
• Adding optional parquet reader schema (#11524) @hyperbolic2346
• Adds GPU implementation of JSON-token-stream to JSON-tree (#11518) @karthikeyann
• Add gdb pretty-printers for simple types (#11499) @upsj
• Add create_random_column function to the data generator (#11490) @vuule
• Add fluent API builder to data_profile (#11479) @vuule
• Adds Nested Json benchmark (#11466) @karthikeyann
• Convert thrust::optional usages to std::optional (#11455) @robertmaynard
• Python API for the future experimental JSON reader (#11426) @vuule
• Return schema info from JSON reader (#11419) @vuule
• Add regex ASCII flag support for matching builtin character classes (#11404) @davidwendt
• Truncate parquet column indexes (#11403) @etseidl
• Adds the end-to-end JSON parser implementation (#11388) @elstehle
• Use the new JSON parser when the experimental reader is selected (#11364) @vuule
• Add placeholder for the experimental JSON reader (#11334) @vuule
• Add read-only functions on string dtypes to DataFrame.apply and Series.apply (#11319) @brandon-b-miller
• Added 'crosstab' and 'pivot_table' features (#11314) @shaswat-indian
• Quickly error out when trying to build with unsupported nvcc versions (#11297) @robertmaynard
• Adds JSON tokenizer (#11264) @elstehle
• List lexicographic comparator (#11129) @devavret
• Add generic type inference for cuIO (#11121) @PointKernel
• Fully support nested types in cudf::contains (#10656) @ttnghia
• Support nested types in lists::contains (#10548) @ttnghia

🛠️ Improvements

• Pin dask and distributed for release (#11822) @galipremsagar
• Add examples for Nested JSON reader (#11814) @GregoryKimball
• Support shuffle-based groupby aggregations in dask_cudf (#11800) @rjzamora
• Update strings udf version updater script (#11772) @galipremsagar
• Remove kwargs in read_csv & to_csv (#11762) @galipremsagar
• Pass dtype param to avoid pd.Series warnings (#11761) @galipremsagar
• Enable schema_element & keep_quotes support in json reader (#11746) @galipremsagar
• Add ability to construct ListColumn when size is None (#11745) @galipremsagar
• Reduces memory requirements in JSON parser and adds bytes/s and peak memory usage to benchmarks (#11732) @elstehle
• Add missing copyright headers. (#11712) @bdice
• Fix copyright check issues in pre-commit (#11711) @bdice
• Include decimal in supported types for range window order-by columns (#11710) @mythrocks
• Disable very large column gtest for contiguous-split (#11706) @davidwendt
• Drop split_out=None test from groupby.agg (#11704) @wence-
• Use CubinLinker for CUDA Minor Version Compatibility (#11701) @gmarkall
• Add regex capture-group parameter to auto convert to non-capture groups (#11695) @davidwendt
• Add a __dataframe__ method to the protocol dataframe object (#11692) @rgommers
• Special-case multibyte_split for single-byte delimiter (#11681) @upsj
• Remove isort exclusions (#11680) @bdice
• Refactor CSV reader benchmarks with nvbench (#11678) @PointKernel
• Check conda recipe headers with pre-commit (#11669) @bdice
• Remove redundant style check for clang-format. (#11668) @bdice
• Add support for group_keys in groupby (#11659) @galipremsagar
• Fix pandoc pinning. (#11658) @bdice
• Revert removal of skip_rows / num_rows options from the Parquet reader. (#11657) @nvdbaranec
• Update git metadata (#11647) @bdice
• Call set_null_count on a returning column if null-count is known (#11646) @davidwendt
• Fix some libcudf detail calls not passing the stream variable (#11642) @davidwendt
• Update to mypy 0.971 (#11640) @wence-
• Refactor strings strip functor to details header (#11635) @davidwendt
• Fix incorrect nullCount in get_json_object (#11633) @trxcllnt
• Simplify hostdevice_vector (#11631) @upsj
• Refactor parquet writer benchmarks with nvbench (#11623) @PointKernel
• Rework contains_scalar to check nulls at runtime (#11622) @davidwendt
• Fix incorrect memory resource used in rolling temp columns (#11618) @mythrocks
• Upgrade pandas to 1.5 (#11617) @galipremsagar
• Move type-dispatcher calls from traits.hpp to traits.cpp (#11616) @davidwendt
• Refactor parquet reader benchmarks with nvbench (#11611) @PointKernel
• Forward-merge branch-22.08 to branch-22.10 (#11608) @bdice
• Use stream in Java API. (#11601) @bdice
• Refactors of public/detail APIs, CUDF_FUNC_RANGE, stream handling. (#11600) @bdice
• Improve ORC writer benchmark with nvbench (#11598) @PointKernel
• Tune multibyte_split kernel (#11587) @upsj
• Move split_utils.cuh to strings/detail (#11585) @davidwendt
• Fix warnings due to compiler regression with if constexpr (#11581) @ttnghia
• Add full 24-bit dictionary support to Parquet writer (#11580) @etseidl
• Expose "explicit-comms" option in shuffle-based dask_cudf functions (#11576) @rjzamora
• Move cudf::strings::findall_record to cudf::strings::findall (#11575) @davidwendt
• Refactor dask_cudf groupby to use apply_concat_apply (#11571) @rjzamora
• Add ability to write list(struct) columns as map type in orc writer (#11568) @galipremsagar
• Add byte_range to multibyte_split benchmark + NVBench refactor (#11562) @upsj
• JNI support for writing binary columns in parquet (#11556) @revans2
• Support additional dictionary bit widths in Parquet writer (#11547) @etseidl
• Refactor string/numeric conversion utilities (#11545) @davidwendt
• Removing unnecessary asserts in parquet tests (#11544) @hyperbolic2346
• Clean up ORC reader benchmarks with NVBench (#11543) @PointKernel
• Reuse MurmurHash3_32 in Parquet page data. (#11528) @bdice
• Add hexadecimal value separators (#11527) @bdice
• Deprecate skiprows and num_rows in read_orc (#11522) @galipremsagar
• Struct support for NULL_EQUALS binary operation (#11520) @rwlee
• Bump hadoop-common from 3.2.3 to 3.2.4 in /java (#11516) @dependabot[bot]
• Fix Feather test warning. (#11511) @bdice
• copy_range ballot_syncs to have no execution dependency (#11508) @robertmaynard
• Upgrade to arrow-9.x (#11507) @galipremsagar
• Remove support for skip_rows / num_rows options in the parquet reader. (#11503) @nvdbaranec
• Single-pass multibyte_split (#11500) @upsj
• Sanitize percentile_approx() output for empty input (#11498) @SrikarVanavasam
• Unpin dask and distributed for development (#11492) @galipremsagar
• Move SparkMurmurHash3_32 functor. (#11489) @bdice
• Refactor group_nunique.cu to use nullate::DYNAMIC for reduce-by-key functor (#11482) @davidwendt
• Drop support for skiprows and num_rows in cudf.read_parquet (#11480) @galipremsagar
• Add reduction distinct_count benchmark (#11473) @ttnghia
• Add groupby nunique aggregation benchmark (#11472) @ttnghia
• Disable Arrow S3 support by default. (#11470) @bdice
• Add groupby max aggregation benchmark (#11464) @ttnghia
• Extract Dremel encoding code from Parquet (#11461) @vyasr
• Add missing Thrust #includes. (#11457) @bdice
• Make CMake hooks verbose (#11456) @vyasr
• Control Parquet page size through Python API (#11454) @etseidl
• Add control of Parquet column index creation to python (#11453) @etseidl
• Remove unused is_struct trait. (#11450) @bdice
• Refactor the Buffer class (#11447) @madsbk
• Refactor pad_side and strip_type enums into side_type enum (#11438) @davidwendt
• Update to Thrust 1.17.0 (#11437) @bdice
• Add in JNI for parsing JSON data and getting the metadata back too. (#11431) @revans2
• Convert byte_array_view to use std::byte (#11424) @hyperbolic2346
• Deprecate unflatten_nested_columns (#11421) @SrikarVanavasam
• Remove HASH_SERIAL_MURMUR3 / serial32BitMurmurHash3 (#11383) @bdice
• Add Spark list hashing Java tests (#11379) @bdice
• Move cmake to the build section. (#11376) @vyasr
• Remove use of CUDA driver API calls from libcudf (#11370) @shwina
• Add column constructor from device_uvector&& (#11356) @SrikarVanavasam
• Remove unused custreamz thirdparty directory (#11343) @vyasr
• Update jni version to 22.10.0-SNAPSHOT (#11338) @pxLi
• Enable using upstream jitify2 (#11287) @shwina
• Cache cudf.Scalar (#11246) @shwina
• Remove deprecated Series.applymap. (#11031) @bdice
• Remove deprecated expand parameter from str.findall. (#11030) @bdice

🚨 Breaking Changes

• Pin numpy to <1.23 (#11824) @galipremsagar
• Remove legacy join APIs (#11274) @vyasr
• Remove lists::drop_list_duplicates (#11236) @ttnghia
• Remove Index.replace API (#11131) @vyasr
• Remove deprecated Index methods from Frame (#11073) @vyasr
• Remove public API of cudf.merge_sorted. (#11032) @bdice
• Drop python 3.7 in code-base (#11029) @galipremsagar
• Return empty dataframe when reading a Parquet file using empty columns option (#11018) @vuule
• Remove Arrow CUDA IPC code (#10995) @shwina
• Buffer: make .ptr read-only (#10872) @madsbk

🐛 Bug Fixes

• Fix out-of-bound access in cudf::detail::label_segments (#11497) @ttnghia
• Fix distributed error related to loop_in_thread (#11428) @galipremsagar
• Fix atomic operations on NaN values (#11420) @ttnghia
• Relax arrow pinning to just 8.x and remove cuda build dependency from cudf recipe (#11412) @kkraus14
• Revert "Allow CuPy 11" (#11409) @jakirkham
• Fix moto timeouts (#11369) @galipremsagar
• Set +/-infinity as the identity values for floating-point numbers in device operators min and max (#11357) @ttnghia
• Fix memory_usage() for ListSeries (#11355) @thomcom
• Fix constructing Column from column_view with expired mask (#11354) @shwina
• Handle parquet corner case: Columns with more rows than are in the row group. (#11353) @nvdbaranec
• Fix DatetimeIndex & TimedeltaIndex constructors (#11342) @galipremsagar
• Fix unsigned-compare compile warning in IntPow binops (#11339) @davidwendt
• Fix performance issue and add a new code path to cudf::detail::contains (#11330) @ttnghia
• Pin pytorch to temporarily unblock from libcupti errors (#11289) @galipremsagar
• Workaround for nvcomp zstd overwriting blocks for orc due to underestimate of sizes (#11288) @jbrennan333
• Fix inconsistency when hashing two tables in cudf::detail::contains (#11284) @ttnghia
• Fix issue related to numpy array and category dtype (#11282) @galipremsagar
• Add NotImplementedError when on is specified in DataFrame.join. (#11275) @vyasr
• Fix invalid allocate_like() and empty_like() tests. (#11268) @nvdbaranec
• Returns DataFrame When Concating Along Axis 1 (#11263) @isVoid
• Fix compile error due to missing header (#11257) @ttnghia
• Fix a memory aliasing/crash issue in scatter for lists. (#11254) @nvdbaranec
• Fix tests/rolling/empty_input_test (#11238) @ttnghia
• Fix const qualifier when using host_span<bitmask_type const*> (#11220) @ttnghia
• Avoid using nvcompBatchedDeflateDecompressGetTempSizeEx in cuIO (#11213) @vuule
• Generate benchmark data with correct run length regardless of cardinality (#11205) @vuule
• Fix cumulative count index behavior (#11188) @brandon-b-miller
• Fix assertion in dask_cudf test_struct_explode (#11170) @rjzamora
• Provides a method for the user to remove the hook and re-register the hook in a custom shutdown hook manager (#11161) @res-life
• Fix compatibility issues with pandas 1.4.3 (#11152) @vyasr
• Ensure cuco export set is installed in cmake build (#11147) @jlowe
• Avoid redundant deepcopy in cudf.from_pandas (#11142) @galipremsagar
• Fix compile error due to missing header (#11126) @ttnghia
• Fix __cuda_array_interface__ failures (#11113) @galipremsagar
• Support octal and hex within regex character class pattern (#11112) @davidwendt
• Fix split_re matching logic for word boundaries (#11106) @davidwendt
• Handle multiple files metadata in read_parquet (#11105) @galipremsagar
• Fix index alignment for Series objects with repeated index (#11103) @shwina
• FindcuFile now searches in the current CUDA Toolkit location (#11101) @robertmaynard
• Fix regex word boundary logic to include underline (#11099) @davidwendt
• Exclude CudaFatalTest when selecting all Java tests (#11083) @jlowe
• Fix duplicate cudatoolkit pinning issue (#11070) @galipremsagar
• Maintain the input index in the result of a groupby-transform (#11068) @shwina
• Fix bug with row count comparison for expect_columns_equivalent(). (#11059) @nvdbaranec
• Fix BPE uninitialized size value for null and empty input strings (#11054) @davidwendt
• Include missing header for usage of get_current_device_resource() (#11047) @AtlantaPepsi
• Fix warn_unused_result error in parquet test (#11026) @karthikeyann
• Return empty dataframe when reading a Parquet file using empty columns option (#11018) @vuule
• Fix small error in page row count limiting (#10991) @etseidl
• Fix a row index entry error in ORC writer issue (#10989) @vuule
• Fix grouped covariance to require both values to be convertible to double. (#10891) @bdice

📖 Documentation

• Defer loading of custom.js (#11465) @galipremsagar
• Fix issues with day & night modes in python docs (#11400) @galipremsagar
• Update missing data handling APIs in docs (#11345) @galipremsagar
• Add lists filtering APIs to doxygen group. (#11336) @bdice
• Remove unused import in README sample (#11318) @vyasr
• Note null behavior in where docs (#11276) @brandon-b-miller
• Update docstring for spans in get_row_data_range (#11271) @vyasr
• Update nvCOMP integration table (#11231) @vuule
• Add dev docs for documentation writing (#11217) @vyasr
• Documentation fix for concatenate (#11187) @dagardner-nv
• Fix unresolved links in markdown (#11173) @karthikeyann
• Fix cudf version in README.md install commands (#11164) @jvanstraten
• Switch language from None to "en" in docs build (#11133) @galipremsagar
• Remove docs mentioning scalar_view since no such class exists. (#11132) @bdice
• Add docstring entry for DataFrame.value_counts (#11039) @galipremsagar
• Add docs to rolling var, std, count. (#11035) @bdice
• Fix docs for Numba UDFs. (#11020) @bdice
• Replace column comparison utilities functions with macros (#11007) @karthikeyann
• Fix Doxygen warnings in multiple headers files (#11003) @karthikeyann
• Fix doxygen warnings in utilities/ headers (#10974) @karthikeyann
• Fix Doxygen warnings in table header files (#10964) @karthikeyann
• Fix Doxygen warnings in column header files (#10963) @karthikeyann
• Fix Doxygen warnings in strings / header files (#10937) @karthikeyann
• Generate Doxygen Tag File for Libcudf (#10932) @isVoid
• Fix doxygen warnings in structs, lists headers (#10923) @karthikeyann
• Fix doxygen warnings in fixed_point.hpp (#10922) @karthikeyann
• Fix doxygen warnings in ast/, rolling, tdigest/, wrappers/, dictionary/ headers (#10921) @karthikeyann
• fix doxygen warnings in cudf/io/types.hpp, other header files (#10913) @karthikeyann
• fix doxygen warnings in cudf/io/ avro, csv, json, orc, parquet header files (#10912) @karthikeyann
• Fix doxygen warnings in cudf/*.hpp (#10896) @karthikeyann
• Add missing documentation in aggregation.hpp (#10887) @karthikeyann
• Revise PR template. (#10774) @bdice

🚀 New Features

• Change cmake to allow controlling Arrow version via cmake variable (#11429) @kkraus14
• Adding support for list<int8> columns to be written as byte arrays in parquet (#11328) @hyperbolic2346
• Adding byte array view structure (#11322) @hyperbolic2346
• Adding byte_array statistics (#11303) @hyperbolic2346
• Add column indexes to Parquet writer (#11302) @etseidl
• Provide an Option for Default Integer and Floating Bitwidth (#11272) @isVoid
• FST benchmark (#11243) @karthikeyann
• Adds the Finite-State Transducer algorithm (#11242) @elstehle
• Refactor collect_set to use cudf::distinct and cudf::lists::distinct (#11228) @ttnghia
• Treat zstd as stable in nvcomp releases 2.3.2 and later (#11226) @jbrennan333
• Add 24 bit dictionary support to Parquet writer (#11216) @devavret
• Enable positive group indices for extractAllRecord on JNI (#11215) @anthony-chang
• JNI bindings for NTH_ELEMENT window aggregation (#11201) @mythrocks
• Add JNI bindings for extractAllRecord (#11196) @anthony-chang
• Add cudf.options (#11193) @isVoid
• Add thrift support for parquet column and offset indexes (#11178) @etseidl
• Adding binary read/write as options for parquet (#11160) @hyperbolic2346
• Support nth_element for window functions (#11158) @mythrocks
• Implement lists::distinct and cudf::detail::stable_distinct (#11149) @ttnghia
• Implement Groupby pct_change (#11144) @skirui-source
• Add JNI for set operations (#11143) @ttnghia
• Remove deprecated PER_THREAD_DEFAULT_STREAM (#11134) @jbrennan333
• Added a Java method to check the existence of a list of keys in a map (#11128) @razajafri
• Feature/python benchmarking (#11125) @vyasr
• Support nan_equality in cudf::distinct (#11118) @ttnghia
• Added JNI for getMapValueForKeys (#11104) @razajafri
• Refactor semi_anti_join (#11100) @ttnghia
• Replace remaining instances of rmm::cuda_stream_default with cudf::default_stream_value (#11082) @jbrennan333
• Adds the Logical Stack algorithm (#11078) @elstehle
• Add doxygen-check pre-commit hook (#11076) @karthikeyann
• Use new nvCOMP API to optimize the decompression temp memory size (#11064) @vuule
• Add Doxygen CI check (#11057) @karthikeyann
• Support duplicate_keep_option in cudf::distinct (#11052) @ttnghia
• Support set operations (#11043) @ttnghia
• Support for ZLIB compression in ORC writer (#11036) @vuule
• Adding feature swaplevels (#11027) @VamsiTallam95
• Use nvCOMP for ZLIB decompression in ORC reader (#11024) @vuule
• Function for bfill, ffill #9591 (#11022) @Sreekiran096
• Generate group offsets from element labels (#11017) @ttnghia
• Feature axes (#10979) @VamsiTallam95
• Generate group labels from offsets (#10945) @ttnghia
• Add missing cuIO benchmark coverage for duration types (#10933) @vuule
• Dask-cuDF cumulative groupby ops (#10889) @brandon-b-miller
• Reindex Improvements (#10815) @brandon-b-miller
• Implement value_counts for DataFrame (#10813) @martinfalisse

🛠️ Improvements

• Pin numpy to <1.23 (#11824) @galipremsagar
• Make Index Join Tests on Default Precisions Deterministic (#11451) @isVoid
• Pin dask & distributed for release (#11433) @galipremsagar
• Use documented header template for doxygen (#11430) @galipremsagar
• Relax arrow version in dev env (#11418) @galipremsagar
• Added Java bindings for Parquet options for binary read (#11410) @razajafri
• Allow CuPy 11 (#11393) @jakirkham
• Improve multibyte_split performance (#11347) @cwharris
• Switch death test to use explicit trap. (#11326) @vyasr
• Add --output-on-failure to ctest args. (#11321) @vyasr
• Consolidate remaining DataFrame/Series APIs (#11315) @vyasr
• Add JNI support for the join_strings API (#11309) @revans2
• Add cupy version to setup.py install_requires (#11306) @vyasr
• removing some unused code (#11305) @hyperbolic2346
• Add test of wildcard selection (#11300) @vyasr
• Update parquet reader to take stream parameter (#11294) @PointKernel
• Spark list hashing (#11292) @bdice
• Remove legacy join APIs (#11274) @vyasr
• Fix cudf recipes syntax (#11273) @ajschmidt8
• Fix cudf recipe (#11267) @ajschmidt8
• Cleanup config files (#11266) @vyasr
• Run mypy on all packages (#11265) @vyasr
• Update to isort 5.10.1. (#11262) @vyasr
• Consolidate flake8 and pydocstyle configuration (#11260) @vyasr
• Remove redundant black config specifications. (#11258) @vyasr
• Ensure DeprecationWarnings are not introduced via pre-commit (#11255) @wence-
• Optimization to gpu::PreprocessColumnData in parquet reader. (#11252) @nvdbaranec
• Move rolling impl details to detail/ directory. (#11250) @mythrocks
• Remove lists::drop_list_duplicates (#11236) @ttnghia
• Use cudf::lists::distinct in Python binding (#11234) @ttnghia
• Use cudf::lists::distinct in Java binding (#11233) @ttnghia
• Use cudf::distinct in Java binding (#11232) @ttnghia
• Pin dask-cuda in dev environment (#11229) @galipremsagar
• Remove cruft in map_lookup (#11221) @mythrocks
• Deprecate skiprows & num_rows in parquet reader (#11218) @galipremsagar
• Remove Frame._index (#11210) @vyasr
• Improve performance for cudf::contains when searching for a scalar (#11202) @ttnghia
• Document why Development component is needing for CMake. (#11200) @vyasr
• cleanup unused code in rolling_test.hpp (#11195) @karthikeyann
• Standardize join internals around DataFrame (#11184) @vyasr
• Move character case table declarations from src to detail (#11183) @davidwendt
• Remove usage of Frame in StringMethods (#11181) @vyasr
• Expose get_json_object_options to Python (#11180) @SrikarVanavasam
• Fix decimal128 stats in parquet writer (#11179) @etseidl
• Modify CheckPageRows in parquet_test to use datasources (#11177) @etseidl
• Pin max version of cuda-python to 11.7.0 (#11174) @Ethyling
• Refactor and optimize Frame.where (#11168) @vyasr
• Add npos const static member to cudf::string_view (#11166) @davidwendt
• Move _drop_rows_by_label from Frame to IndexedFrame (#11157) @vyasr
• Clean up _copy_type_metadata (#11156) @vyasr
• Add nvcc conda package in dev environment (#11154) @galipremsagar
• Struct binary comparison op functionality for spark rapids (#11153) @rwlee
• Refactor inline conditionals. (#11151) @bdice
• Refactor Spark hashing tests (#11145) @bdice
• Add new _from_data_like_self factory (#11140) @vyasr
• Update get_cucollections to use rapids-cmake (#11139) @vyasr
• Remove unnecessary extra function for libcudacxx detection (#11138) @vyasr
• Allow initial value for cudf::reduce and cudf::segmented_reduce. (#11137) @SrikarVanavasam
• Remove Index.replace API (#11131) @vyasr
• Move char-type table function declarations from src to detail (#11127) @davidwendt
• Clean up repo root (#11124) @bdice
• Improve print formatting of strings containing newline characters. (#11108) @nvdbaranec
• Fix cudf::string_view::find() to return pos for empty string argument (#11107) @davidwendt
• Forward-merge branch-22.06 to branch-22.08 (#11086) @bdice
• Take iterators by value in clamp.cu. (#11084) @bdice
• Performance improvements for row to column conversions (#11075) @hyperbolic2346
• Remove deprecated Index methods from Frame (#11073) @vyasr
• Use per-page max compressed size estimate for compression (#11066) @devavret
• column to row refactor for performance (#11063) @hyperbolic2346
• Include skbuild directory into build.sh clean operation (#11060) @galipremsagar
• Unpin dask & distributed for development (#11058) @galipremsagar
• Add support for Series.between (#11051) @galipremsagar
• Fix groupby include (#11046) @bwyogatama
• Regex cleanup internal reclass and reclass_device classes (#11045) @davidwendt
• Remove public API of cudf.merge_sorted. (#11032) @bdice
• Drop python 3.7 in code-base (#11029) @galipremsagar
• Addition & integration of the integer power operator (#11025) @AtlantaPepsi
• Refactor lists::contains (#11019) @ttnghia
• Change build.sh to find C++ library by default and avoid shadowing CMAKE_ARGS (#11013) @vyasr
• Clean up parquet unit test (#11005) @PointKernel
• Add missing #pragma once to header files (#11004) @karthikeyann
• Cleanup iterator.cuh and add fixed point support for scalar_optional_accessor (#10999) @ttnghia
• Refactor cudf::contains (#10997) @ttnghia
• Remove Arrow CUDA IPC code (#10995) @shwina
• Change file extension for groupby benchmark (#10985) @ttnghia
• Sort recipe include checks. (#10984) @bdice
• Update cuCollections for thrust upgrade (#10983) @PointKernel
• Expose row-group size options in cudf ParquetWriter (#10980) @rjzamora
• Cleanup cudf::strings::detail::regex_parser class source (#10975) @davidwendt
• Handle missing fields as nulls in get_json_object() (#10970) @SrikarVanavasam
• Fix license families to match all-caps expected by conda-verify. (#10931) @bdice
• Include <optional> for GCC 11 compatibility. (#10927) @bdice
• Enable builds with scikit-build (#10919) @vyasr
• Improve distinct by using cuco::static_map::retrieve_all (#10916) @PointKernel
• update cudfjni to 22.08.0-SNAPSHOT (#10910) @pxLi
• Improve the capture of fatal cuda error (#10884) @sperlingxx
• Cleanup regex compiler operators and operands source (#10879) @davidwendt
• Buffer: make .ptr read-only (#10872) @madsbk
• Configurable NaN handling in device_row_comparators (#10870) @rwlee
• Register cudf.core.groupby.Grouper objects to dask grouper_dispatch (#10838) @brandon-b-miller
• Upgrade to arrow-8 (#10816) @galipremsagar
• Remove getattr method in RangeIndex class (#10538) @skirui-source
• Adding bins to value counts (#8247) @marlenezw

🚨 Breaking Changes

• Remove legacy join APIs (#11274) @vyasr
• Remove lists::drop_list_duplicates (#11236) @ttnghia
• Remove Index.replace API (#11131) @vyasr
• Remove deprecated Index methods from Frame (#11073) @vyasr
• Remove public API of cudf.merge_sorted. (#11032) @bdice
• Drop python 3.7 in code-base (#11029) @galipremsagar
• Return empty dataframe when reading a Parquet file using empty columns option (#11018) @vuule
• Remove Arrow CUDA IPC code (#10995) @shwina
• Buffer: make .ptr read-only (#10872) @madsbk

🐛 Bug Fixes

• Fix distributed error related to loop_in_thread (#11428) @galipremsagar
• Relax arrow pinning to just 8.x and remove cuda build dependency from cudf recipe (#11412) @kkraus14
• Revert "Allow CuPy 11" (#11409) @jakirkham
• Fix moto timeouts (#11369) @galipremsagar
• Set +/-infinity as the identity values for floating-point numbers in device operators min and max (#11357) @ttnghia
• Fix memory_usage() for ListSeries (#11355) @thomcom
• Fix constructing Column from column_view with expired mask (#11354) @shwina
• Handle parquet corner case: Columns with more rows than are in the row group. (#11353) @nvdbaranec
• Fix DatetimeIndex & TimedeltaIndex constructors (#11342) @galipremsagar
• Fix unsigned-compare compile warning in IntPow binops (#11339) @davidwendt
• Fix performance issue and add a new code path to cudf::detail::contains (#11330) @ttnghia
• Pin pytorch to temporarily unblock from libcupti errors (#11289) @galipremsagar
• Workaround for nvcomp zstd overwriting blocks for orc due to underestimate of sizes (#11288) @jbrennan333
• Fix inconsistency when hashing two tables in cudf::detail::contains (#11284) @ttnghia
• Fix issue related to numpy array and category dtype (#11282) @galipremsagar
• Add NotImplementedError when on is specified in DataFrame.join. (#11275) @vyasr
• Fix invalid allocate_like() and empty_like() tests. (#11268) @nvdbaranec
• Returns DataFrame When Concating Along Axis 1 (#11263) @isVoid
• Fix compile error due to missing header (#11257) @ttnghia
• Fix a memory aliasing/crash issue in scatter for lists. (#11254) @nvdbaranec
• Fix tests/rolling/empty_input_test (#11238) @ttnghia
• Fix const qualifier when using host_span<bitmask_type const*> (#11220) @ttnghia
• Avoid using nvcompBatchedDeflateDecompressGetTempSizeEx in cuIO (#11213) @vuule
• Generate benchmark data with correct run length regardless of cardinality (#11205) @vuule
• Fix cumulative count index behavior (#11188) @brandon-b-miller
• Fix assertion in dask_cudf test_struct_explode (#11170) @rjzamora
• Provides a method for the user to remove the hook and re-register the hook in a custom shutdown hook manager (#11161) @res-life
• Fix compatibility issues with pandas 1.4.3 (#11152) @vyasr
• Ensure cuco export set is installed in cmake build (#11147) @jlowe
• Avoid redundant deepcopy in cudf.from_pandas (#11142) @galipremsagar
• Fix compile error due to missing header (#11126) @ttnghia
• Fix __cuda_array_interface__ failures (#11113) @galipremsagar
• Support octal and hex within regex character class pattern (#11112) @davidwendt
• Fix split_re matching logic for word boundaries (#11106) @davidwendt
• Handle multiple files metadata in read_parquet (#11105) @galipremsagar
• Fix index alignment for Series objects with repeated index (#11103) @shwina
• FindcuFile now searches in the current CUDA Toolkit location (#11101) @robertmaynard
• Fix regex word boundary logic to include underline (#11099) @davidwendt
• Exclude CudaFatalTest when selecting all Java tests (#11083) @jlowe
• Fix duplicate cudatoolkit pinning issue (#11070) @galipremsagar
• Maintain the input index in the result of a groupby-transform (#11068) @shwina
• Fix bug with row count comparison for expect_columns_equivalent(). (#11059) @nvdbaranec
• Fix BPE uninitialized size value for null and empty input strings (#11054) @davidwendt
• Include missing header for usage of get_current_device_resource() (#11047) @AtlantaPepsi
• Fix warn_unused_result error in parquet test (#11026) @karthikeyann
• Return empty dataframe when reading a Parquet file using empty columns option (#11018) @vuule
• Fix small error in page row count limiting (#10991) @etseidl
• Fix a row index entry error in ORC writer issue (#10989) @vuule
• Fix grouped covariance to require both values to be convertible to double. (#10891) @bdice

📖 Documentation

• Fix issues with day & night modes in python docs (#11400) @galipremsagar
• Update missing data handling APIs in docs (#11345) @galipremsagar
• Add lists filtering APIs to doxygen group. (#11336) @bdice
• Remove unused import in README sample (#11318) @vyasr
• Note null behavior in where docs (#11276) @brandon-b-miller
• Update docstring for spans in get_row_data_range (#11271) @vyasr
• Update nvCOMP integration table (#11231) @vuule
• Add dev docs for documentation writing (#11217) @vyasr
• Documentation fix for concatenate (#11187) @dagardner-nv
• Fix unresolved links in markdown (#11173) @karthikeyann
• Fix cudf version in README.md install commands (#11164) @jvanstraten
• Switch language from None to "en" in docs build (#11133) @galipremsagar
• Remove docs mentioning scalar_view since no such class exists. (#11132) @bdice
• Add docstring entry for DataFrame.value_counts (#11039) @galipremsagar
• Add docs to rolling var, std, count. (#11035) @bdice
• Fix docs for Numba UDFs. (#11020) @bdice
• Replace column comparison utilities functions with macros (#11007) @karthikeyann
• Fix Doxygen warnings in multiple headers files (#11003) @karthikeyann
• Fix doxygen warnings in utilities/ headers (#10974) @karthikeyann
• Fix Doxygen warnings in table header files (#10964) @karthikeyann
• Fix Doxygen warnings in column header files (#10963) @karthikeyann
• Fix Doxygen warnings in strings / header files (#10937) @karthikeyann
• Generate Doxygen Tag File for Libcudf (#10932) @isVoid
• Fix doxygen warnings in structs, lists headers (#10923) @karthikeyann
• Fix doxygen warnings in fixed_point.hpp (#10922) @karthikeyann
• Fix doxygen warnings in ast/, rolling, tdigest/, wrappers/, dictionary/ headers (#10921) @karthikeyann
• fix doxygen warnings in cudf/io/types.hpp, other header files (#10913) @karthikeyann
• fix doxygen warnings in cudf/io/ avro, csv, json, orc, parquet header files (#10912) @karthikeyann
• Fix doxygen warnings in cudf/*.hpp (#10896) @karthikeyann
• Add missing documentation in aggregation.hpp (#10887) @karthikeyann
• Revise PR template. (#10774) @bdice

🚀 New Features

• Change cmake to allow controlling Arrow version via cmake variable (#11429) @kkraus14
• Adding support for list<int8> columns to be written as byte arrays in parquet (#11328) @hyperbolic2346
• Adding byte array view structure (#11322) @hyperbolic2346
• Adding byte_array statistics (#11303) @hyperbolic2346
• Add column indexes to Parquet writer (#11302) @etseidl
• Provide an Option for Default Integer and Floating Bitwidth (#11272) @isVoid
• FST benchmark (#11243) @karthikeyann
• Adds the Finite-State Transducer algorithm (#11242) @elstehle
• Refactor collect_set to use cudf::distinct and cudf::lists::distinct (#11228) @ttnghia
• Treat zstd as stable in nvcomp releases 2.3.2 and later (#11226) @jbrennan333
• Add 24 bit dictionary support to Parquet writer (#11216) @devavret
• Enable positive group indices for extractAllRecord on JNI (#11215) @anthony-chang
• JNI bindings for NTH_ELEMENT window aggregation (#11201) @mythrocks
• Add JNI bindings for extractAllRecord (#11196) @anthony-chang
• Add cudf.options (#11193) @isVoid
• Add thrift support for parquet column and offset indexes (#11178) @etseidl
• Adding binary read/write as options for parquet (#11160) @hyperbolic2346
• Support nth_element for window functions (#11158) @mythrocks
• Implement lists::distinct and cudf::detail::stable_distinct (#11149) @ttnghia
• Implement Groupby pct_change (#11144) @skirui-source
• Add JNI for set operations (#11143) @ttnghia
• Remove deprecated PER_THREAD_DEFAULT_STREAM (#11134) @jbrennan333
• Added a Java method to check the existence of a list of keys in a map (#11128) @razajafri
• Feature/python benchmarking (#11125) @vyasr
• Support nan_equality in cudf::distinct (#11118) @ttnghia
• Added JNI for getMapValueForKeys (#11104) @razajafri
• Refactor semi_anti_join (#11100) @ttnghia
• Replace remaining instances of rmm::cuda_stream_default with cudf::default_stream_value (#11082) @jbrennan333
• Adds the Logical Stack algorithm (#11078) @elstehle
• Add doxygen-check pre-commit hook (#11076) @karthikeyann
• Use new nvCOMP API to optimize the decompression temp memory size (#11064) @vuule
• Add Doxygen CI check (#11057) @karthikeyann
• Support duplicate_keep_option in cudf::distinct (#11052) @ttnghia
• Support set operations (#11043) @ttnghia
• Support for ZLIB compression in ORC writer (#11036) @vuule
• Adding feature swaplevels (#11027) @VamsiTallam95
• Use nvCOMP for ZLIB decompression in ORC reader (#11024) @vuule
• Function for bfill, ffill #9591 (#11022) @Sreekiran096
• Generate group offsets from element labels (#11017) @ttnghia
• Feature axes (#10979) @VamsiTallam95
• Generate group labels from offsets (#10945) @ttnghia
• Add missing cuIO benchmark coverage for duration types (#10933) @vuule
• Dask-cuDF cumulative groupby ops (#10889) @brandon-b-miller
• Reindex Improvements (#10815) @brandon-b-miller
• Implement value_counts for DataFrame (#10813) @martinfalisse

🛠️ Improvements

• Pin dask & distributed for release (#11433) @galipremsagar
• Use documented header template for doxygen (#11430) @galipremsagar
• Relax arrow version in dev env (#11418) @galipremsagar
• Allow CuPy 11 (#11393) @jakirkham
• Improve multibyte_split performance (#11347) @cwharris
• Switch death test to use explicit trap. (#11326) @vyasr
• Add --output-on-failure to ctest args. (#11321) @vyasr
• Consolidate remaining DataFrame/Series APIs (#11315) @vyasr
• Add JNI support for the join_strings API (#11309) @revans2
• Add cupy version to setup.py install_requires (#11306) @vyasr
• removing some unused code (#11305) @hyperbolic2346
• Add test of wildcard selection (#11300) @vyasr
• Update parquet reader to take stream parameter (#11294) @PointKernel
• Spark list hashing (#11292) @bdice
• Remove legacy join APIs (#11274) @vyasr
• Fix cudf recipes syntax (#11273) @ajschmidt8
• Fix cudf recipe (#11267) @ajschmidt8
• Cleanup config files (#11266) @vyasr
• Run mypy on all packages (#11265) @vyasr
• Update to isort 5.10.1. (#11262) @vyasr
• Consolidate flake8 and pydocstyle configuration (#11260) @vyasr
• Remove redundant black config specifications. (#11258) @vyasr
• Ensure DeprecationWarnings are not introduced via pre-commit (#11255) @wence-
• Optimization to gpu::PreprocessColumnData in parquet reader. (#11252) @nvdbaranec
• Move rolling impl details to detail/ directory. (#11250) @mythrocks
• Remove lists::drop_list_duplicates (#11236) @ttnghia
• Use cudf::lists::distinct in Python binding (#11234) @ttnghia
• Use cudf::lists::distinct in Java binding (#11233) @ttnghia
• Use cudf::distinct in Java binding (#11232) @ttnghia
• Pin dask-cuda in dev environment (#11229) @galipremsagar
• Remove cruft in map_lookup (#11221) @mythrocks
• Deprecate skiprows & num_rows in parquet reader (#11218) @galipremsagar
• Remove Frame._index (#11210) @vyasr
• Improve performance for cudf::contains when searching for a scalar (#11202) @ttnghia
• Document why Development component is needing for CMake. (#11200) @vyasr
• cleanup unused code in rolling_test.hpp (#11195) @karthikeyann
• Standardize join internals around DataFrame (#11184) @vyasr
• Move character case table declarations from src to detail (#11183) @davidwendt
• Remove usage of Frame in StringMethods (#11181) @vyasr
• Expose get_json_object_options to Python (#11180) @SrikarVanavasam
• Fix decimal128 stats in parquet writer (#11179) @etseidl
• Modify CheckPageRows in parquet_test to use datasources (#11177) @etseidl
• Pin max version of cuda-python to 11.7.0 (#11174) @Ethyling
• Refactor and optimize Frame.where (#11168) @vyasr
• Add npos const static member to cudf::string_view (#11166) @davidwendt
• Move _drop_rows_by_label from Frame to IndexedFrame (#11157) @vyasr
• Clean up _copy_type_metadata (#11156) @vyasr
• Add nvcc conda package in dev environment (#11154) @galipremsagar
• Struct binary comparison op functionality for spark rapids (#11153) @rwlee
• Refactor inline conditionals. (#11151) @bdice
• Refactor Spark hashing tests (#11145) @bdice
• Add new _from_data_like_self factory (#11140) @vyasr
• Update get_cucollections to use rapids-cmake (#11139) @vyasr
• Remove unnecessary extra function for libcudacxx detection (#11138) @vyasr
• Allow initial value for cudf::reduce and cudf::segmented_reduce. (#11137) @SrikarVanavasam
• Remove Index.replace API (#11131) @vyasr
• Move char-type table function declarations from src to detail (#11127) @davidwendt
• Clean up repo root (#11124) @bdice
• Improve print formatting of strings containing newline characters. (#11108) @nvdbaranec
• Fix cudf::string_view::find() to return pos for empty string argument (#11107) @davidwendt
• Forward-merge branch-22.06 to branch-22.08 (#11086) @bdice
• Take iterators by value in clamp.cu. (#11084) @bdice
• Performance improvements for row to column conversions (#11075) @hyperbolic2346
• Remove deprecated Index methods from Frame (#11073) @vyasr
• Use per-page max compressed size estimate for compression (#11066) @devavret
• column to row refactor for performance (#11063) @hyperbolic2346
• Include skbuild directory into build.sh clean operation (#11060) @galipremsagar
• Unpin dask & distributed for development (#11058) @galipremsagar
• Add support for Series.between (#11051) @galipremsagar
• Fix groupby include (#11046) @bwyogatama
• Regex cleanup internal reclass and reclass_device classes (#11045) @davidwendt
• Remove public API of cudf.merge_sorted. (#11032) @bdice
• Drop python 3.7 in code-base (#11029) @galipremsagar
• Addition & integration of the integer power operator (#11025) @AtlantaPepsi
• Refactor lists::contains (#11019) @ttnghia
• Change build.sh to find C++ library by default and avoid shadowing CMAKE_ARGS (#11013) @vyasr
• Clean up parquet unit test (#11005) @PointKernel
• Add missing #pragma once to header files (#11004) @karthikeyann
• Cleanup iterator.cuh and add fixed point support for scalar_optional_accessor (#10999) @ttnghia
• Refactor cudf::contains (#10997) @ttnghia
• Remove Arrow CUDA IPC code (#10995) @shwina
• Change file extension for groupby benchmark (#10985) @ttnghia
• Sort recipe include checks. (#10984) @bdice
• Update cuCollections for thrust upgrade (#10983) @PointKernel
• Expose row-group size options in cudf ParquetWriter (#10980) @rjzamora
• Cleanup cudf::strings::detail::regex_parser class source (#10975) @davidwendt
• Handle missing fields as nulls in get_json_object() (#10970) @SrikarVanavasam
• Fix license families to match all-caps expected by conda-verify. (#10931) @bdice
• Include <optional> for GCC 11 compatibility. (#10927) @bdice
• Enable builds with scikit-build (#10919) @vyasr
• Improve distinct by using cuco::static_map::retrieve_all (#10916) @PointKernel
• update cudfjni to 22.08.0-SNAPSHOT (#10910) @pxLi
• Improve the capture of fatal cuda error (#10884) @sperlingxx
• Cleanup regex compiler operators and operands source (#10879) @davidwendt
• Buffer: make .ptr read-only (#10872) @madsbk
• Configurable NaN handling in device_row_comparators (#10870) @rwlee
• Register cudf.core.groupby.Grouper objects to dask grouper_dispatch (#10838) @brandon-b-miller
• Upgrade to arrow-8 (#10816) @galipremsagar
• Remove getattr method in RangeIndex class (#10538) @skirui-source
• Adding bins to value counts (#8247) @marlenezw

v22.06.01

🚨 Breaking Changes

• Enable Zstandard decompression only when all nvcomp integrations are enabled (#10944) @vuule
• Rename sliced_child to get_sliced_child. (#10885) @bdice
• Add parameters to control page size in Parquet writer (#10882) @etseidl
• Make cudf::test::expect_columns_equal() to fail when comparing unsanitary lists. (#10880) @nvdbaranec
• Cleanup regex compiler fixed quantifiers source (#10843) @davidwendt
• Refactor cudf::contains, renaming and switching parameters role (#10802) @ttnghia
• Generic serialization of all column types (#10784) @wence-
• Return per-file metadata from readers (#10782) @vuule
• HostColumnVectoreCore#isNull should return true for out-of-range rows (#10779) @gerashegalov
• Update groupby::hash to use new row operators for keys (#10770) @PointKernel
• update mangle_dupe_cols behavior in csv reader to match pandas 1.4.0 behavior (#10749) @karthikeyann
• Rename CUDA_TRY macro to CUDF_CUDA_TRY, rename CHECK_CUDA macro to CUDF_CHECK_CUDA. (#10589) @bdice
• Upgrade cudf to support pandas 1.4.x versions (#10584) @galipremsagar
• Move binop methods from Frame to IndexedFrame and standardize the docstring (#10576) @vyasr
• Add default= kwarg to .list.get() accessor method (#10547) @shwina
• Remove deprecated decimal_cols_as_float in the ORC reader (#10515) @vuule
• Support nvComp 2.3 if local, otherwise use nvcomp 2.2 (#10513) @robertmaynard
• Fix findall_record to return empty list for no matches (#10491) @davidwendt
• Namespace/Docstring Fixes for Reduction (#10471) @isVoid
• Additional refactoring of hash functions (#10462) @bdice
• Fix default value of str.split expand parameter. (#10457) @bdice
• Remove deprecated code. (#10450) @vyasr

🐛 Bug Fixes

• Fix single column MultiIndex issue in sort_index (#10957) @galipremsagar
• Make SerializedTableHeader(numRows) public (#10949) @gerashegalov
• Fix gcc_linux version pinning in dev environment (#10943) @galipremsagar
• Fix an issue with reading raw string in cudf.read_json (#10924) @galipremsagar
• Make cudf::test::expect_columns_equal() to fail when comparing unsanitary lists. (#10880) @nvdbaranec
• Fix segmented_reduce on empty column with non-empty offsets (#10876) @davidwendt
• Fix dask-cudf groupby handling when grouping by all columns (#10866) @charlesbluca
• Fix a bug in distinct: using nested nulls logic (#10848) @PointKernel
• Fix constness / references in weak ordering operator() signatures. (#10846) @bdice
• Suppress sizeof-array-div warnings in thrust found by gcc-11 (#10840) @robertmaynard
• Add handling for string by-columns in dask-cudf groupby (#10830) @charlesbluca
• Fix compile warning in search.cu (#10827) @davidwendt
• Fix element access const correctness in hostdevice_vector (#10804) @vuule
• Update cuco git tag (#10788) @PointKernel
• HostColumnVectoreCore#isNull should return true for out-of-range rows (#10779) @gerashegalov
• Fixing deprecation warnings in test_orc.py (#10772) @hyperbolic2346
• Enable writing to s3 storage in chunked parquet writer (#10769) @galipremsagar
• Fix construction of nested structs with EMPTY child (#10761) @shwina
• Fix replace error when regex has only zero match quantifiers (#10760) @davidwendt
• Fix an issue with one_level_list schemas in parquet reader. (#10750) @nvdbaranec
• update mangle_dupe_cols behavior in csv reader to match pandas 1.4.0 behavior (#10749) @karthikeyann
• Fix cupy function in notebook (#10737) @ajschmidt8
• Fix fillna to retain columns when it is MultiIndex (#10729) @galipremsagar
• Fix scatter for all-empty-string column case (#10724) @davidwendt
• Retain series name in Series.apply (#10716) @brandon-b-miller
• Correct build dir cudf-config dependency issues for static builds (#10704) @robertmaynard
• Fix list of testing requirements in setup.py. (#10678) @bdice
• Fix rounding to zero error in stod on very small float numbers (#10672) @davidwendt
• cuco isn't a cudf dependency when we are built shared (#10662) @robertmaynard
• Fix to_timestamps to support Z for %z format specifier (#10617) @davidwendt
• Verify compression type in Parquet reader (#10610) @vuule
• Fix struct row comparator's exception on empty structs (#10604) @sperlingxx
• Fix strings strip() to accept only str Scalar for to_strip parameter (#10597) @davidwendt
• Fix has_atomic_support check in can_use_hash_groupby() (#10588) @jbrennan333
• Revert Thrust 1.16 to Thrust 1.15 (#10586) @bdice
• Fix missing RMM_STATIC_CUDART define when compiling JNI with static CUDA runtime (#10585) @jlowe
• pin more cmake versions (#10570) @robertmaynard
• Re-enable Build Metrics Report (#10562) @davidwendt
• Remove statically linked CUDA runtime check in Java build (#10532) @jlowe
• Fix temp data cleanup in test_text.py (#10524) @brandon-b-miller
• Update pre-commit to run black 22.3.0 (#10523) @vyasr
• Remove deprecated decimal_cols_as_float in the ORC reader (#10515) @vuule
• Fix findall_record to return empty list for no matches (#10491) @davidwendt
• Allow users to specify data types for a subset of columns in read_csv (#10484) @vuule
• Fix default value of str.split expand parameter. (#10457) @bdice
• Improve coverage of dask-cudf's groupby aggregation, add tests for dropna support (#10449) @charlesbluca
• Allow string aggs for dask_cudf.CudfDataFrameGroupBy.aggregate (#10222) @charlesbluca
• In-place updates with loc or iloc don't work correctly when the LHS has more than one column (#9918) @skirui-source

📖 Documentation

• Clarify append deprecation notice. (#10930) @bdice
• Use full name of GPUDirect Storage SDK in docs (#10904) @vuule
• Update Dask + Pandas to Dask + cuDF path (#10897) @miguelusque
• Add missing documentation in cudf/types.hpp (#10895) @karthikeyann
• Add strong index iterator docs. (#10888) @bdice
• spell check fixes (#10865) @karthikeyann
• Add missing documentation in scalar/ headers (#10861) @karthikeyann
• Remove typo in ngram documentation (#10859) @miguelusque
• fix doxygen warnings (#10842) @karthikeyann
• Add a library_design.md file documenting the core Python data structures and their relationship (#10817) @vyasr
• Add NumPy to intersphinx references. (#10809) @bdice
• Add a section to the docs that compares cuDF with Pandas (#10796) @shwina
• Mention 2 cpp-reviewer requirement in pull request template (#10768) @davidwendt
• Enable pydocstyle for all packages. (#10759) @bdice
• Enable pydocstyle rules involving quotes (#10748) @vyasr
• Revise 10 minutes notebook. (#10738) @bdice
• Reorganize cuDF Python docs (#10691) @shwina
• Fix sphinx/jupyter heading issue in UDF notebook (#10690) @brandon-b-miller
• Migrated user guide notebooks to MyST-NB and added sphinx extension (#10685) @mmccarty
• add data generation to benchmark documentation (#10677) @karthikeyann
• Fix some docs build warnings (#10674) @galipremsagar
• Update UDF notebook in User Guide. (#10668) @bdice
• Improve User Guide docs (#10663) @bdice
• Fix some docstrings formatting (#10660) @galipremsagar
• Remove implementation details from apply docstrings (#10651) @brandon-b-miller
• Revise CONTRIBUTING.md (#10644) @bdice
• Add missing APIs to documentation. (#10643) @bdice
• Use cudf.read_json as documented API name. (#10640) @bdice
• Fix docstring section headings. (#10639) @bdice
• Document cudf.read_text and cudf.read_avro. (#10638) @bdice
• Fix type-o in docstring for json_reader_options (#10627) @dagardner-nv
• Update guide to UDFs with notes about Series.applymap deprecation and related changes (#10607) @brandon-b-miller
• Fix doxygen Modules page for cudf::lists::sequences (#10561) @davidwendt
• Add Replace Backreferences section to Regex Features page (#10560) @davidwendt
• Introduce deprecation policy to developer guide. (#10252) @vyasr

🚀 New Features

• Enable Zstandard decompression only when all nvcomp integrations are enabled (#10944) @vuule
• Handle nested types in cudf::concatenate_rows() (#10890) @nvdbaranec
• Strong index types for equality comparator (#10883) @ttnghia
• Add parameters to control page size in Parquet writer (#10882) @etseidl
• Support for Zstandard decompression in ORC reader (#10873) @vuule
• Use pre-built nvcomp 2.3 binaries by default (#10851) @robertmaynard
• Support for Zstandard decompression in Parquet reader (#10847) @vuule
• Add JNI support for apply_boolean_mask (#10812) @res-life
• Segmented Min/Max for Fixed Point Types (#10794) @isVoid
• Return per-file metadata from readers (#10782) @vuule
• Segmented apply_boolean_mask for LIST columns (#10773) @mythrocks
• Update groupby::hash to use new row operators for keys (#10770) @PointKernel
• Support purging non-empty null elements from LIST/STRING columns (#10701) @mythrocks
• Add detail::hash_join (#10695) @PointKernel
• Persist string statistics data across multiple calls to orc chunked write (#10694) @hyperbolic2346
• Add .list.astype() to cast list leaves to specified dtype (#10693) @shwina
• JNI: Add generateListOffsets API (#10683) @sperlingxx
• Support args in groupby apply (#10682) @brandon-b-miller
• Enable segmented_gather in Java package (#10669) @sperlingxx
• Add row hasher with nested column support (#10641) @devavret
• Add support for numeric_only in DataFrame._reduce (#10629) @martinfalisse
• First step toward statistics in ORC files with chunked writes (#10567) @hyperbolic2346
• Add support for struct columns to the random table generator (#10566) @vuule
• Enable passing a sequence for the index argument to .list.get() (#10564) @shwina
• Add python bindings for cudf::list::index_of (#10549) @ChrisJar
• Add default= kwarg to .list.get() accessor method (#10547) @shwina
• Add cudf.DataFrame.applymap (#10542) @brandon-b-miller
• Support nvComp 2.3 if local, otherwise use nvcomp 2.2 (#10513) @robertmaynard
• Add column field ID control in parquet writer (#10504) @PointKernel
• Deprecate Series.applymap (#10497) @brandon-b-miller
• Add option to drop cache in cuIO benchmarks (#10488) @vuule
• move benchmark input generation in device in reduction nvbench (#10486) @karthikeyann
• Support Segmented Min/Max Reduction on String Type (#10447) @isVoid
• List element Equality comparator (#10289) @devavret
• Implement all methods of groupby rank aggregation in libcudf, python (#9569) @karthikeyann
• Implement DataFrame.eval using libcudf ASTs (#8022) @vyasr

🛠️ Improvements

• Use conda compilers in env file (#10915) @galipremsagar
• Remove C style artifacts in cuIO (#10886) @vuule
• Rename sliced_child to get_sliced_child. (#10885) @bdice
• Replace defaulted stream value for libcudf APIs that use NVCOMP (#10877) @jbrennan333
• Add more unit tests for cudf::distinct for nested types with sliced input (#10860) @ttnghia
• Changing list_view.cuh to list_view.hpp (#10854) @ttnghia
• More error checking in from_dlpack (#10850) @wence-
• Cleanup regex compiler fixed quantifiers source (#10843) @davidwendt
• Adds the JNI call for Cuda.deviceSynchronize (#10839) @abellina
• Add missing cuda-python dependency to cudf (#10833) @bdice
• Change std::string parameters in cudf::strings APIs to std::string_view (#10832) @davidwendt
• Split up search.cu to improve compile time (#10831) @davidwendt
• Add tests for null scalar binaryops (#10828) @brandon-b-miller
• Cleanup regex compile optimize functions (#10825) @davidwendt
• Use ThreadedMotoServer instead of subprocess in spinning up s3 server (#10822) @galipremsagar
• Import NA from missing rather than using cudf.NA everywhere (#10821) @brandon-b-miller
• Refactor regex builtin character-class identifiers (#10814) @davidwendt
• Change pattern parameter for regex APIs from std::string to std::string_view (#10810) @davidwendt
• Make the JNI API to get list offsets as a view public. (#10807) @revans2
• Add cudf JNI docker build github action (#10806) @pxLi
• Removed mr parameter from inplace bitmask operations (#10805) @AtlantaPepsi
• Refactor cudf::contains, renaming and switching parameters role (#10802) @ttnghia
• Handle closed property in IntervalDtype.from_pandas (#10798) @wence-
• Return weak orderings from device_row_comparator. (#10793) @rwlee
• Rework Scalar imports (#10791) @brandon-b-miller
• Enable ccache for cudfjni build in Docker (#10790) @gerashegalov
• Generic serialization of all column types (#10784) @wence-
• simplifying skiprows test in test_orc.py (#10783) @hyperbolic2346
• Use column_views instead of column_device_views in binary operations. (#10780) @bdice
• Add struct utility functions. (#10776) @bdice
• Add multiple rows to subword tokenizer benchmark (#10767) @davidwendt
• Refactor host decompression in ORC reader (#10764) @vuule
• Flush output streams before creating a process to drop caches (#10762) @vuule
• Refactor binaryop/compiled/util.cpp (#10756) @bdice
• Use warp per string for long strings in cudf::strings::contains() (#10739) @davidwendt
• Use generator expressions in any/all functions. (#10736) @bdice
• Use canonical "magic methods" (replace x.__repr__() with repr(x)). (#10735) @bdice
• Improve use of isinstance. (#10734) @bdice
• Rename tests from multiIndex to multiindex. (#10732) @bdice
• Two-table comparators with strong index types (#10730) @bdice
• Replace std::make_pair with std::pair (C++17 CTAD) (#10727) @karthikeyann
• Use structured bindings instead of std::tie (#10726) @karthikeyann
• Missing f prefix on f-strings fix (#10721) @code-review-doctor
• Add max_file_size parameter to chunked parquet dataset writer (#10718) @galipremsagar
• Deprecate merge_sorted, change dask cudf usage to internal method (#10713) @isVoid
• Prepare dask_cudf test_parquet.py for upcoming API changes (#10709) @rjzamora
• Remove or simplify various utility functions (#10705) @vyasr
• Allow building arrow with parquet and not python (#10702) @revans2
• Partial cuIO GPU decompression refactor (#10699) @vuule
• Cython API refactor: merge.pyx (#10698) @isVoid
• Fix random string data length to become variable (#10697) @galipremsagar
• Add bindings for index_of with column search key (#10696) @ChrisJar
• Deprecate index merging (#10689) @vyasr
• Remove cudf::strings::string namespace (#10684) @davidwendt
• Standardize imports. (#10680) @bdice
• Standardize usage of collections.abc. (#10679) @bdice
• Cython API Refactor: transpose.pyx, sort.pyx (#10675) @isVoid
• Add device_memory_resource parameter to create_string_vector_from_column (#10673) @davidwendt
• Split up mixed-join kernels source files (#10671) @davidwendt
• Use std::filesystem for temporary directory location and deletion (#10664) @vuule
• cleanup benchmark includes (#10661) @karthikeyann
• Use upstream clang-format pre-commit hook. (#10659) @bdice
• Clean up C++ includes to use <> instead of "". (#10658) @bdice
• Handle RuntimeError thrown by CUDA Python in validate_setup (#10653) @shwina
• Rework JNI CMake to leverage rapids_find_package (#10649) @jlowe
• Use conda to build python packages during GPU tests (#10648) @Ethyling
• Deprecate various functions that don't need to be defined for Index. (#10647) @vyasr
• Update pinning to allow newer CMake versions. (#10646) @vyasr
• Bump hadoop-common from 3.1.4 to 3.2.3 in /java (#10645) @dependabot[bot]
• Remove concurrent_unordered_multimap. (#10642) @bdice
• Improve parquet dictionary encoding (#10635) @PointKernel
• Improve cudf::cuda_error (#10630) @sperlingxx
• Add support for null and non-numeric types in Series.diff and DataFrame.diff (#10625) @Matt711
• Branch 22.06 merge 22.04 (#10624) @vyasr
• Unpin dask & distributed for development (#10623) @galipremsagar
• Slightly improve accuracy of stod in to_floats (#10622) @davidwendt
• Allow libcudfjni to be built as a static library (#10619) @jlowe
• Change stack-based regex state data to use global memory (#10600) @davidwendt
• Resolve Forward merging of branch-22.04 into branch-22.06 (#10598) @galipremsagar
• KvikIO as an alternative GDS backend (#10593) @madsbk
• Rename CUDA_TRY macro to CUDF_CUDA_TRY, rename CHECK_CUDA macro to CUDF_CHECK_CUDA. (#10589) @bdice
• Upgrade cudf to support pandas 1.4.x versions (#10584) @galipremsagar
• Refactor binary ops for timedelta and datetime columns (#10581) @vyasr
• Refactor cudf::strings::count_re API to use count_matches utility (#10580) @davidwendt
• Update Programming Language :: Python Versions to 3.8 & 3.9 (#10579) @madsbk
• Automate Java cudf jar build with statically linked dependencies (#10578) @gerashegalov
• Add patch for thrust-cub 1.16 to fix sort compile times (#10577) @davidwendt
• Move binop methods from Frame to IndexedFrame and standardize the docstring (#10576) @vyasr
• Cleanup libcudf strings regex classes (#10573) @davidwendt
• Simplify preprocessing of arguments for DataFrame binops (#10563) @vyasr
• Reduce kernel calls to build strings findall results (#10559) @davidwendt
• Forward-merge branch-22.04 to branch-22.06 (#10557) @bdice
• Update strings contains benchmark to measure varying match rates (#10555) @davidwendt
• JNI: throw CUDA errors more specifically (#10551) @sperlingxx
• Enable building static libs (#10545) @trxcllnt
• Remove pip requirements files. (#10543) @bdice
• Remove Click pinnings that are unnecessary after upgrading black. (#10541) @vyasr
• Refactor memory_usage to improve performance (#10537) @galipremsagar
• Adjust the valid range of group index for replace_with_backrefs (#10530) @sperlingxx
• add accidentally removed comment. (#10526) @vyasr
• Update conda environment. (#10525) @vyasr
• Remove ColumnBase.getitem (#10516) @vyasr
• Optimize left_semi_join by materializing the gather mask (#10511) @cheinger
• Define proper binary operation APIs for columns (#10509) @vyasr
• Upgrade arrow-cpp & pyarrow to 7.0.0 (#10503) @galipremsagar
• Update to Thrust 1.16 (#10489) @bdice
• Namespace/Docstring Fixes for Reduction (#10471) @isVoid
• Update cudfjni 22.06.0-SNAPSHOT (#10467) @pxLi
• Use Lists of Columns for Various Files (#10463) @isVoid
• Additional refactoring of hash functions (#10462) @bdice
• Fix Series.str.findall behavior for expand=False. (#10459) @bdice
• Remove deprecated code. (#10450) @vyasr
• Update cmake-format version. (#10440) @vyasr
• Consolidate C++ conda recipes and add libcudf-tests package (#10326) @ajschmidt8
• Use conda compilers (#10275) @Ethyling
• Add row bitmask as a detail::hash_join member (#10248) @PointKernel

🚨 Breaking Changes

• Drop unsupported method argument from nunique and distinct_count. (#10411) @bdice
• Refactor stream compaction APIs (#10370) @PointKernel
• Add scan_aggregation and reduce_aggregation derived types. (#10357) @nvdbaranec
• Avoid decimal type narrowing for decimal binops (#10299) @galipremsagar
• Rewrites sample API (#10262) @isVoid
• Remove probe-time null equality parameters in cudf::hash_join (#10260) @PointKernel
• Enable proper Index round-tripping in orc reader and writer (#10170) @galipremsagar
• Add JNI for strings::split_re and strings::split_record_re (#10139) @ttnghia
• Change cudf::strings::find_multiple to return a lists column (#10134) @davidwendt
• Remove the option to completely disable decimal128 columns in the ORC reader (#10127) @vuule
• Remove deprecated code (#10124) @vyasr
• Update gpu_utils.py to reflect current CUDA support. (#10113) @bdice
• Optimize compaction operations (#10030) @PointKernel
• Remove deprecated method Series.set_index. (#9945) @bdice
• Add cudf::strings::findall_record API (#9911) @davidwendt
• Upgrade arrow & pyarrow to 6.0.1 (#9686) @galipremsagar

🐛 Bug Fixes

• Fix an issue with tdigest merge aggregations. (#10506) @nvdbaranec
• Batch of fixes for index overflows in grid stride loops. (#10448) @nvdbaranec
• Update dask_cudf imports to be compatible with latest dask (#10442) @rlratzel
• Fix for integer overflow in contiguous-split (#10437) @jbrennan333
• Fix has_null predicate for drop_list_duplicates on nested structs (#10436) @sperlingxx
• Fix empty reduce with List output and non-List input (#10435) @sperlingxx
• Fix list and struct meta generation issue in dask-cudf (#10434) @galipremsagar
• Fix error in cudf.to_numeric when a bool input is passed (#10431) @galipremsagar
• Support cupy array in quantile input (#10429) @galipremsagar
• Fix benchmarks to work with new aggregation types (#10428) @davidwendt
• Fix cudf::shift to handle offset greater than column size (#10414) @davidwendt
• Fix lifespan of the temporary directory that holds cuFile configuration file (#10403) @vuule
• Fix error thrown in compiled-binaryop benchmark (#10398) @davidwendt
• Limiting async allocator using alignment of 512 (#10395) @rongou
• Include <optional> in multibyte split. (#10385) @bdice
• Fix issue with column and scalar re-assignment (#10377) @galipremsagar
• Fix floating point data generation in benchmarks (#10372) @vuule
• Avoid overflow in fused_concatenate_kernel output_index (#10344) @abellina
• Remove is_relationally_comparable for table device views (#10342) @davidwendt
• Fix debug compile error in device_span to column_view conversion (#10331) @davidwendt
• Add Pascal support to JCUDF transcode (row_conversion) (#10329) @mythrocks
• Fix std::bad_alloc exception due to JIT reserving a huge buffer (#10317) @ttnghia
• Fixes up the overflowed fixed-point round on nullable column (#10316) @sperlingxx
• Fix DataFrame slicing issues for empty cases (#10310) @brandon-b-miller
• Fix documentation issues (#10307) @ajschmidt8
• Allow Java bindings to use default decimal precisions when writing columns (#10276) @sperlingxx
• Fix incorrect slicing of GDS read/write calls (#10274) @vuule
• Fix out-of-memory error in compiled-binaryop benchmark (#10269) @davidwendt
• Add tests of reflected ufuncs and fix behavior of logical reflected ufuncs (#10261) @vyasr
• Remove probe-time null equality parameters in cudf::hash_join (#10260) @PointKernel
• Fix out-of-memory error in UrlDecode benchmark (#10258) @davidwendt
• Fix groupby reductions that perform operations on source type instead of target type (#10250) @ttnghia
• Fix small leak in explode (#10245) @revans2
• Yet another small JNI memory leak (#10238) @revans2
• Fix regex octal parsing to limit to 3 characters (#10233) @davidwendt
• Fix string to decimal128 conversion handling large exponents (#10231) @davidwendt
• Fix JNI leak on copy to device (#10229) @revans2
• Fix the data generator element size for decimal types (#10225) @vuule
• Fix decimal metadata in parquet writer (#10224) @galipremsagar
• Fix strings handling of hex in regex pattern (#10220) @davidwendt
• Fix docs builds (#10216) @ajschmidt8
• Fix a leftover _has_nulls change from Nullate (#10211) @devavret
• Fix bitmask of the output for JNI of lists::drop_list_duplicates (#10210) @ttnghia
• Fix compile error in binaryop/compiled/util.cpp (#10209) @ttnghia
• Skip ORC and Parquet readers' benchmark cases that are not currently supported (#10194) @vuule
• Fix JNI leak of a cudf::column_view native class. (#10171) @revans2
• Enable proper Index round-tripping in orc reader and writer (#10170) @galipremsagar
• Convert Column Name to String Before Using Struct Column Factory (#10156) @isVoid
• Preserve the correct ListDtype while creating an identical empty column (#10151) @galipremsagar
• benchmark fixture - static object pointer fix (#10145) @karthikeyann
• Fix UDF Caching (#10133) @brandon-b-miller
• Raise duplicate column error in DataFrame.rename (#10120) @galipremsagar
• Fix flaky memory usage test by guaranteeing array size. (#10114) @vyasr
• Encode values from python callback for C++ (#10103) @jdye64
• Add check for regex instructions causing an infinite-loop (#10095) @davidwendt
• Remove metadata singleton from nvtext normalizer (#10090) @davidwendt
• Column equality testing fixes (#10011) @brandon-b-miller
• Pin libcudf runtime dependency for cudf / libcudf-kafka nightlies (#9847) @charlesbluca

📖 Documentation

• Fix documentation for DataFrame.corr and Series.corr. (#10493) @bdice
• Add cut to API docs (#10479) @shwina
• Remove documentation for methods removed in #10124. (#10366) @bdice
• Fix documentation issues (#10306) @ajschmidt8
• Fix fixed_point binary operation documentation (#10198) @codereport
• Remove cleaned up methods from docs (#10189) @galipremsagar
• Update developer guide to recommend no default stream parameter. (#10136) @bdice
• Update benchmarking guide to use NVBench. (#10093) @bdice

🚀 New Features

• Add StringIO support to read_text (#10465) @cwharris
• Add support for tdigest and merge_tdigest aggregations through cudf::reduce (#10433) @nvdbaranec
• JNI support for Collect Ops in Reduction (#10427) @sperlingxx
• Enable read_text with dask_cudf using byte_range (#10407) @ChrisJar
• Add cudf::stable_sort_by_key (#10387) @PointKernel
• Implement maps_column_view abstraction over LIST<STRUCT<K,V>> (#10380) @mythrocks
• Support Java bindings for Avro reader (#10373) @HaoYang670
• Refactor stream compaction APIs (#10370) @PointKernel
• Support collect aggregations in reduction (#10353) @sperlingxx
• Refactor array_ufunc for Index and unify across all classes (#10346) @vyasr
• Add JNI for extract_list_element with index column (#10341) @firestarman
• Support min and max operations for structs in rolling window (#10332) @ttnghia
• Add device create_sequence_table for benchmarks (#10300) @karthikeyann
• Enable numpy ufuncs for DataFrame (#10287) @vyasr
• move input generation for json benchmark to device (#10281) @karthikeyann
• move input generation for type dispatcher benchmark to device (#10280) @karthikeyann
• move input generation for copy benchmark to device (#10279) @karthikeyann
• generate url decode benchmark input in device (#10278) @karthikeyann
• device input generation in join bench (#10277) @karthikeyann
• Add nvtext::byte_pair_encoding API (#10270) @davidwendt
• Prevent internal usage of expensive APIs (#10263) @vyasr
• Column to JCUDF row for tables with strings (#10235) @hyperbolic2346
• Support percent_rank() aggregation (#10227) @mythrocks
• Refactor Series.array_ufunc (#10217) @vyasr
• Reduce pytest runtime (#10203) @brandon-b-miller
• Add regex flags parameter to python cudf strings split (#10185) @davidwendt
• Support for MOD, PMOD and PYMOD for decimal32/64/128 (#10179) @codereport
• Adding string row size iterator for row to column and column to row conversion (#10157) @hyperbolic2346
• Add file size counter to cuIO benchmarks (#10154) @vuule
• byte_range support for multibyte_split/read_text (#10150) @cwharris
• Add JNI for strings::split_re and strings::split_record_re (#10139) @ttnghia
• Add maxSplit parameter to Java binding for strings:split (#10137) @ttnghia
• Add libcudf strings split API that accepts regex pattern (#10128) @davidwendt
• generate benchmark input in device (#10109) @karthikeyann
• Avoid nan_as_null op if nan_count is 0 (#10082) @galipremsagar
• Add Dataframe and Index nunique (#10077) @martinfalisse
• Support nanosecond timestamps in parquet (#10063) @PointKernel
• Java bindings for mixed semi and anti joins (#10040) @jlowe
• Implement mixed equality/conditional semi/anti joins (#10037) @vyasr
• Optimize compaction operations (#10030) @PointKernel
• Support args= in Series.apply (#9982) @brandon-b-miller
• Add cudf::strings::findall_record API (#9911) @davidwendt
• Add covariance for sort groupby (python) (#9889) @mayankanand007
• Implement DataFrame diff() (#9817) @skirui-source
• Implement DataFrame pct_change (#9805) @skirui-source
• Support segmented reductions and null mask reductions (#9621) @isVoid
• Add 'spearman' correlation method for dataframe.corr and series.corr (#7141) @dominicshanshan

🛠️ Improvements

• Add scipy skip for a test (#10502) @galipremsagar
• Temporarily disable new ops-bot functionality (#10496) @ajschmidt8
• Include <cstddef> to fix compilation of parquet reader on GCC 11. (#10483) @bdice
• Pin dask and distributed (#10481) @galipremsagar
• MD5 refactoring. (#10445) @bdice
• Remove or split up Frame methods that use the index (#10439) @vyasr
• Centralization of tdigest aggregation code. (#10422) @nvdbaranec
• Simplify column binary operations (#10421) @vyasr
• Add .github/ops-bot.yaml config file (#10420) @ajschmidt8
• Use list of columns for methods in Groupby.pyx (#10419) @isVoid
• Remove warnings in test_timedelta.py (#10418) @galipremsagar
• Fix some warnings in test_parquet.py (#10416) @galipremsagar
• JNI support for segmented reduce (#10413) @revans2
• Clean up null mask after purging null entries (#10412) @sperlingxx
• Drop unsupported method argument from nunique and distinct_count. (#10411) @bdice
• Use str instead of builtins.str. (#10410) @bdice
• Fix warnings in test_rolling (#10405) @bdice
• Enable codecov github-check in CI (#10404) @galipremsagar
• Fix warnings in test_cuda_apply, test_numerical, test_pickling, test_unaops. (#10402) @bdice
• Set column names in _from_columns_like_self factory (#10400) @isVoid
• Refactor nvtx annotations in cudf & dask-cudf (#10396) @galipremsagar
• Consolidate .cov and .corr for sort groupby (#10386) @skirui-source
• Consolidate some Frame APIs (#10381) @vyasr
• Refactor hash functions and hash_combine (#10379) @bdice
• Add nvtx annotations for Series and Index (#10374) @galipremsagar
• Refactor filling.repeat API (#10371) @isVoid
• Move standalone UTF8 functions from string_view.hpp to utf8.hpp (#10369) @davidwendt
• Remove doc for deprecated function one_hot_encoding (#10367) @isVoid
• Refactor array function (#10364) @vyasr
• Fix warnings in test_csv.py. (#10362) @bdice
• Implement a mixin for binops (#10360) @vyasr
• Refactor cython interface: copying.pyx (#10359) @isVoid
• Implement a mixin for scans (#10358) @vyasr
• Add scan_aggregation and reduce_aggregation derived types. (#10357) @nvdbaranec
• Add cleanup of python artifacts (#10355) @galipremsagar
• Fix warnings in test_categorical.py. (#10354) @bdice
• Create a dispatcher for invoking regex kernel functions (#10349) @davidwendt
• Fix codecov in CI (#10347) @galipremsagar
• Enable caching for memory_usage calculation in Column (#10345) @galipremsagar
• C++17 cleanup: traits replace std::enable_if<>::type with std::enable_if_t (#10343) @karthikeyann
• JNI: Support appending DECIMAL128 into ColumnBuilder in terms of byte array (#10338) @sperlingxx
• multibyte_split test improvements (#10328) @vuule
• Fix warnings in test_binops.py. (#10327) @bdice
• Fix warnings from pandas in test_array_ufunc.py. (#10324) @bdice
• Update upload script (#10321) @ajschmidt8
• Move hash type declarations to hashing.hpp (#10320) @davidwendt
• C++17 cleanup: traits replace ::value with _v (#10319) @karthikeyann
• Remove internal columns usage (#10315) @vyasr
• Remove extraneous build.sh parameter (#10313) @ajschmidt8
• Add const qualifier to MurmurHash3_32::hash_combine (#10311) @davidwendt
• Remove TODO in libcudf_kafka recipe (#10309) @ajschmidt8
• Add conversions between column_view and device_span<T const>. (#10302) @bdice
• Avoid decimal type narrowing for decimal binops (#10299) @galipremsagar
• Deprecate DataFrame.iteritems and introduce .items (#10298) @galipremsagar
• Explicitly request CMake use gnu++17 over c++17 (#10297) @robertmaynard
• Add copyright check as pre-commit hook. (#10290) @vyasr
• DataFrame insert and creation optimizations (#10285) @galipremsagar
• Improve hash join detail functions (#10273) @PointKernel
• Replace custom cached_property implementation with functools (#10272) @shwina
• Rewrites sample API (#10262) @isVoid
• Bump hadoop-common from 3.1.0 to 3.1.4 in /java (#10259) @dependabot[bot]
• Remove making redundant copy across code-base (#10257) @galipremsagar
• Add more nvtx annotations (#10256) @galipremsagar
• Add copyright check in cudf (#10253) @galipremsagar
• Remove redundant copies in fillna to improve performance (#10241) @galipremsagar
• Remove std::numeric_limit specializations for timestamp & durations (#10239) @codereport
• Optimize DataFrame creation across code-base (#10236) @galipremsagar
• Change pytest distribution algorithm and increase parallelism in CI (#10232) @galipremsagar
• Add environment variables for I/O thread pool and slice sizes (#10218) @vuule
• Add regex flags to strings findall functions (#10208) @davidwendt
• Update dask-cudf parquet tests to reflect upstream bugfixes to _metadata (#10206) @charlesbluca
• Remove unnecessary nunique function in Series. (#10205) @martinfalisse
• Refactor DataFrame tests. (#10204) @bdice
• Rewrites column.__setitem__, Use boolean_mask_scatter (#10202) @isVoid
• Java utilities to aid in accelerating aggregations on 128-bit types (#10201) @jlowe
• Fix docstrings alignment in Frame methods (#10199) @galipremsagar
• Fix cuco pair issue in hash join (#10195) @PointKernel
• Replace dask groupby .index usages with .by (#10193) @galipremsagar
• Add regex flags to strings extract function (#10192) @davidwendt
• Forward-merge branch-22.02 to branch-22.04 (#10191) @bdice
• Add CMake install rule for tests (#10190) @ajschmidt8
• Unpin dask & distributed (#10182) @galipremsagar
• Add comments to explain test validation (#10176) @galipremsagar
• Reduce warnings in pytest output (#10168) @bdice
• Some consolidation of indexed frame methods (#10167) @vyasr
• Refactor isin implementations (#10165) @vyasr
• Faster struct row comparator (#10164) @devavret
• Refactor groupby::get_groups. (#10161) @bdice
• Deprecate decimal_cols_as_float in ORC reader (C++ layer) (#10152) @vuule
• Replace ccache with sccache (#10146) @ajschmidt8
• Murmur3 hash kernel cleanup (#10143) @rwlee
• Deprecate decimal_cols_as_float in ORC reader (#10142) @galipremsagar
• Run pyupgrade 2.31.0. (#10141) @bdice
• Remove drop_nan from internal IndexedFrame._drop_na_rows. (#10140) @bdice
• Change cudf::strings::find_multiple to return a lists column (#10134) @davidwendt
• Update cmake-format script for branch 22.04. (#10132) @bdice
• Accept r-value references in convert_table_for_return(): (#10131) @mythrocks
• Remove the option to completely disable decimal128 columns in the ORC reader (#10127) @vuule
• Remove deprecated code (#10124) @vyasr
• Update gpu_utils.py to reflect current CUDA support. (#10113) @bdice
• Remove benchmarks suffix (#10112) @bdice
• Update cudf java binding version to 22.04.0-SNAPSHOT (#10084) @pxLi
• Remove unnecessary docker files. (#10069) @vyasr
• Limit benchmark iterations using environment variable (#10060) @karthikeyann
• Add timing chart for libcudf build metrics report page (#10038) @davidwendt
• JNI: Rewrite growBuffersAndRows to accelerate the HostColumnBuilder (#10025) @sperlingxx
• Reduce redundant code in CUDF JNI (#10019) @mythrocks
• Make snappy decompress check more efficient (#9995) @cheinger
• Remove deprecated method Series.set_index. (#9945) @bdice
• Implement a mixin for reductions (#9925) @vyasr
• JNI: Push back decimal utils from spark-rapids (#9907) @sperlingxx
• Add assert_column_memory_* (#9882) @isVoid
• Add CUDF_UNREACHABLE macro. (#9727) @bdice
• Upgrade arrow & pyarrow to 6.0.1 (#9686) @galipremsagar

🚨 Breaking Changes

• ORC writer API changes for granular statistics (#10058) @mythrocks
• decimal128 Support for to/from_arrow (#9986) @codereport
• Remove deprecated method one_hot_encoding (#9977) @isVoid
• Remove str.subword_tokenize (#9968) @VibhuJawa
• Remove deprecated method parameter from merge and join. (#9944) @bdice
• Remove deprecated method DataFrame.hash_columns. (#9943) @bdice
• Remove deprecated method Series.hash_encode. (#9942) @bdice
• Refactoring ceil/round/floor code for datetime64 types (#9926) @mayankanand007
• Introduce nan_as_null parameter for cudf.Index (#9893) @galipremsagar
• Add regex_flags parameter to strings replace_re functions (#9878) @davidwendt
• Break tie for top categorical columns in Series.describe (#9867) @isVoid
• Add partitioning support in parquet writer (#9810) @devavret
• Move drop_duplicates, drop_na, _gather, take to IndexFrame and create their _base_index counterparts (#9807) @isVoid
• Raise temporary error for decimal128 types in parquet reader (#9804) @galipremsagar
• Change default dtype of all nulls column from float to object (#9803) @galipremsagar
• Remove unused masked udf cython/c++ code (#9792) @brandon-b-miller
• Pick smallest decimal type with required precision in ORC reader (#9775) @vuule
• Add decimal128 support to Parquet reader and writer (#9765) @vuule
• Refactor TableTest assertion methods to a separate utility class (#9762) @jlowe
• Use cuFile direct device reads/writes by default in cuIO (#9722) @vuule
• Match pandas scalar result types in reductions (#9717) @brandon-b-miller
• Add parameters to control row group size in Parquet writer (#9677) @vuule
• Refactor bit counting APIs, introduce valid/null count functions, and split host/device side code for segmented counts. (#9588) @bdice
• Add support for decimal128 in cudf python (#9533) @galipremsagar
• Implement lists::index_of() to find positions in list rows (#9510) @mythrocks
• Rewriting row/column conversions for Spark <-> cudf data conversions (#8444) @hyperbolic2346

🐛 Bug Fixes

• Add check for negative stripe index in ORC reader (#10074) @vuule
• Update Java tests to expect DECIMAL128 from Arrow (#10073) @jlowe
• Avoid index materialization when DataFrame is created with un-named Series objects (#10071) @galipremsagar
• fix gcc 11 compilation errors (#10067) @rongou
• Fix columns ordering issue in parquet reader (#10066) @galipremsagar
• Fix dataframe setitem with ndarray types (#10056) @galipremsagar
• Remove implicit copy due to conversion from cudf::size_type and size_t (#10045) @robertmaynard
• Include <optional> in headers that use std::optional (#10044) @robertmaynard
• Fix repr and concat of StructColumn (#10042) @galipremsagar
• Include row group level stats when writing ORC files (#10041) @vuule
• build.sh respects the --build_metrics and --incl_cache_stats flags (#10035) @robertmaynard
• Fix memory leaks in JNI native code. (#10029) @mythrocks
• Update JNI to use new arena mr constructor (#10027) @rongou
• Fix null check when comparing structs in arg_min operation of reduction/groupby (#10026) @ttnghia
• Wrap CI script shell variables in quotes to fix local testing. (#10018) @bdice
• cudftestutil no longer propagates compiler flags to external users (#10017) @robertmaynard
• Remove CUDA_DEVICE_CALLABLE macro usage (#10015) @hyperbolic2346
• Add missing list filling header in meta.yaml (#10007) @devavret
• Fix conda recipes for custreamz & cudf_kafka (#10003) @ajschmidt8
• Fix matching regex word-boundary (\b) in strings replace (#9997) @davidwendt
• Fix null check when comparing structs in min and max reduction/groupby operations (#9994) @ttnghia
• Fix octal pattern matching in regex string (#9993) @davidwendt
• decimal128 Support for to/from_arrow (#9986) @codereport
• Fix groupby shift/diff/fill after selecting from a GroupBy (#9984) @shwina
• Fix the overflow problem of decimal rescale (#9966) @sperlingxx
• Use default value for decimal precision in parquet writer when not specified (#9963) @devavret
• Fix cudf java build error. (#9958) @firestarman
• Use gpuci_mamba_retry to install local artifacts. (#9951) @bdice
• Fix regression HostColumnVectorCore requiring native libs (#9948) @jlowe
• Rename aggregate_metadata in writer to fix name collision (#9938) @devavret
• Fixed issue with percentile_approx where output tdigests could have uninitialized data at the end. (#9931) @nvdbaranec
• Resolve racecheck errors in ORC kernels (#9916) @vuule
• Fix the java build after parquet partitioning support (#9908) @revans2
• Fix compilation of benchmark for parquet writer. (#9905) @bdice
• Fix a memcheck error in ORC writer (#9896) @vuule
• Introduce nan_as_null parameter for cudf.Index (#9893) @galipremsagar
• Fix fallback to sort aggregation for grouping only hash aggregate (#9891) @abellina
• Add zlib to cudfjni link when using static libcudf library dependency (#9890) @jlowe
• TimedeltaIndex constructor raises an AttributeError. (#9884) @skirui-source
• Fix cudf.Scalar string datetime construction (#9875) @brandon-b-miller
• Load libcufile.so with RTLD_NODELETE flag (#9872) @vuule
• Break tie for top categorical columns in Series.describe (#9867) @isVoid
• Fix null handling for structs min and arg_min in groupby, groupby scan, reduction, and inclusive_scan (#9864) @ttnghia
• Add one-level list encoding support in parquet reader (#9848) @PointKernel
• Fix an out-of-bounds read in validity copying in contiguous_split. (#9842) @nvdbaranec
• Fix join of MultiIndex to Index with one column and overlapping name. (#9830) @vyasr
• Fix caching in Series.applymap (#9821) @brandon-b-miller
• Enforce boolean ascending for dask-cudf sort_values (#9814) @charlesbluca
• Fix ORC writer crash with empty input columns (#9808) @vuule
• Change default dtype of all nulls column from float to object (#9803) @galipremsagar
• Load native dependencies when Java ColumnView is loaded (#9800) @jlowe
• Fix dtype-argument bug in dask_cudf read_csv (#9796) @rjzamora
• Fix overflow for min calculation in strings::from_timestamps (#9793) @revans2
• Fix memory error due to lambda return type deduction limitation (#9778) @karthikeyann
• Revert regex $/EOL end-of-string new-line special case handling (#9774) @davidwendt
• Fix missing streams (#9767) @karthikeyann
• Fix make_empty_scalar_like on list_type (#9759) @sperlingxx
• Update cmake and conda to 22.02 (#9746) @devavret
• Fix out-of-bounds memory write in decimal128-to-string conversion (#9740) @davidwendt
• Match pandas scalar result types in reductions (#9717) @brandon-b-miller
• Fix regex non-multiline EOL/$ matching strings ending with a new-line (#9715) @davidwendt
• Fixed build by adding more checks for int8, int16 (#9707) @razajafri
• Fix null handling when boolean dtype is passed (#9691) @galipremsagar
• Fix stream usage in segmented_gather() (#9679) @mythrocks

📖 Documentation

• Update decimal dtypes related docs entries (#10072) @galipremsagar
• Fix regex doc describing hexadecimal escape characters (#10009) @davidwendt
• Fix cudf compilation instructions. (#9956) @esoha-nvidia
• Fix see also links for IO APIs (#9895) @galipremsagar
• Fix build instructions for libcudf doxygen (#9837) @davidwendt
• Fix some doxygen warnings and add missing documentation (#9770) @karthikeyann
• update cuda version in local build (#9736) @karthikeyann
• Fix doxygen for enum types in libcudf (#9724) @davidwendt
• Spell check fixes (#9682) @karthikeyann
• Fix links in C++ Developer Guide. (#9675) @bdice

🚀 New Features

• Remove libcudacxx patch needed for nvcc 11.4 (#10057) @robertmaynard
• Allow CuPy 10 (#10048) @jakirkham
• Add in support for NULL_LOGICAL_AND and NULL_LOGICAL_OR binops (#10016) @revans2
• Add groupby.transform (only support for aggregations) (#10005) @shwina
• Add partitioning support to Parquet chunked writer (#10000) @devavret
• Add jni for sequences (#9972) @wbo4958
• Java bindings for mixed left, inner, and full joins (#9941) @jlowe
• Java bindings for JSON reader support (#9940) @wbo4958
• Enable transpose for string columns in cudf python (#9937) @galipremsagar
• Support structs for cudf::contains with column/scalar input (#9929) @ttnghia
• Implement mixed equality/conditional joins (#9917) @vyasr
• Add cudf::strings::extract_all API (#9909) @davidwendt
• Implement JNI for cudf::scatter APIs (#9903) @ttnghia
• JNI: Function to copy and set validity from bool column. (#9901) @mythrocks
• Add dictionary support to cudf::copy_if_else (#9887) @davidwendt
• add run_benchmarks target for running benchmarks with json output (#9879) @karthikeyann
• Add regex_flags parameter to strings replace_re functions (#9878) @davidwendt
• Add_suffix and add_prefix for DataFrames and Series (#9846) @mayankanand007
• Add JNI for cudf::drop_duplicates (#9841) @ttnghia
• Implement per-list sequence (#9839) @ttnghia
• adding series.transpose (#9835) @mayankanand007
• Adding support for Series.autocorr (#9833) @mayankanand007
• Support round operation on datetime64 datatypes (#9820) @mayankanand007
• Add partitioning support in parquet writer (#9810) @devavret
• Raise temporary error for decimal128 types in parquet reader (#9804) @galipremsagar
• Add decimal128 support to Parquet reader and writer (#9765) @vuule
• Optimize groupby::scan (#9754) @PointKernel
• Add sample JNI API (#9728) @res-life
• Support min and max in inclusive scan for structs (#9725) @ttnghia
• Add first and last method to IndexedFrame (#9710) @isVoid
• Support min and max reduction for structs (#9697) @ttnghia
• Add parameters to control row group size in Parquet writer (#9677) @vuule
• Run compute-sanitizer in nightly build (#9641) @karthikeyann
• Implement Series.datetime.floor (#9571) @skirui-source
• ceil/floor for DatetimeIndex (#9554) @mayankanand007
• Add support for decimal128 in cudf python (#9533) @galipremsagar
• Implement lists::index_of() to find positions in list rows (#9510) @mythrocks
• custreamz oauth callback for kafka (librdkafka) (#9486) @jdye64
• Add Pearson correlation for sort groupby (python) (#9166) @skirui-source
• Interchange dataframe protocol (#9071) @iskode
• Rewriting row/column conversions for Spark <-> cudf data conversions (#8444) @hyperbolic2346

🛠️ Improvements

• Prepare upload scripts for Python 3.7 removal (#10092) @Ethyling
• Simplify custreamz and cudf_kafka recipes files (#10065) @Ethyling
• ORC writer API changes for granular statistics (#10058) @mythrocks
• Remove python constraints in cutreamz and cudf_kafka recipes (#10052) @Ethyling
• Unpin dask and distributed in CI (#10028) @galipremsagar
• Add _from_column_like_self factory (#10022) @isVoid
• Replace custom CUDA bindings previously provided by RMM with official CUDA Python bindings (#10008) @shwina
• Use cuda::std::is_arithmetic in cudf::is_numeric trait. (#9996) @bdice
• Clean up CUDA stream use in cuIO (#9991) @vuule
• Use addressed-ordered first fit for the pinned memory pool (#9989) @rongou
• Add strings tests to transpose_test.cpp (#9985) @davidwendt
• Use gpuci_mamba_retry on Java CI. (#9983) @bdice
• Remove deprecated method one_hot_encoding (#9977) @isVoid
• Minor cleanup of unused Python functions (#9974) @vyasr
• Use new efficient partitioned parquet writing in cuDF (#9971) @devavret
• Remove str.subword_tokenize (#9968) @VibhuJawa
• Forward-merge branch-21.12 to branch-22.02 (#9947) @bdice
• Remove deprecated method parameter from merge and join. (#9944) @bdice
• Remove deprecated method DataFrame.hash_columns. (#9943) @bdice
• Remove deprecated method Series.hash_encode. (#9942) @bdice
• use ninja in java ci build (#9933) @rongou
• Add build-time publish step to cpu build script (#9927) @davidwendt
• Refactoring ceil/round/floor code for datetime64 types (#9926) @mayankanand007
• Remove various unused functions (#9922) @vyasr
• Raise in query if dtype is not supported (#9921) @brandon-b-miller
• Add missing imports tests (#9920) @Ethyling
• Spark Decimal128 hashing (#9919) @rwlee
• Replace thrust/std::get with structured bindings (#9915) @codereport
• Upgrade thrust version to 1.15 (#9912) @robertmaynard
• Remove conda envs for CUDA 11.0 and 11.2. (#9910) @bdice
• Return count of set bits from inplace_bitmask_and. (#9904) @bdice
• Use dynamic nullate for join hasher and equality comparator (#9902) @davidwendt
• Update ucx-py version on release using rvc (#9897) @Ethyling
• Remove IncludeCategories from .clang-format (#9876) @codereport
• Support statically linking CUDA runtime for Java bindings (#9873) @jlowe
• Add clang-tidy to libcudf (#9860) @codereport
• Remove deprecated methods from Java Table class (#9853) @jlowe
• Add test for map column metadata handling in ORC writer (#9852) @vuule
• Use pandas to_offset to parse frequency string in date_range (#9843) @isVoid
• add templated benchmark with fixture (#9838) @karthikeyann
• Use list of column inputs for apply_boolean_mask (#9832) @isVoid
• Added a few more tests for Decimal to String cast (#9818) @razajafri
• Run doctests. (#9815) @bdice
• Avoid overflow for fixed_point round (#9809) @sperlingxx
• Move drop_duplicates, drop_na, _gather, take to IndexFrame and create their _base_index counterparts (#9807) @isVoid
• Use vector factories for host-device copies. (#9806) @bdice
• Refactor host device macros (#9797) @vyasr
• Remove unused masked udf cython/c++ code (#9792) @brandon-b-miller
• Allow custom sort functions for dask-cudf sort_values (#9789) @charlesbluca
• Improve build time of libcudf iterator tests (#9788) @davidwendt
• Copy Java native dependencies directly into classpath (#9787) @jlowe
• Add decimal types to cuIO benchmarks (#9776) @vuule
• Pick smallest decimal type with required precision in ORC reader (#9775) @vuule
• Avoid overflow for fixed_point cudf::cast and performance optimization (#9772) @codereport
• Use CTAD with Thrust function objects (#9768) @codereport
• Refactor TableTest assertion methods to a separate utility class (#9762) @jlowe
• Use Java classloader to find test resources (#9760) @jlowe
• Allow cast decimal128 to string and add tests (#9756) @razajafri
• Load balance optimization for contiguous_split (#9755) @nvdbaranec
• Consolidate and improve reset_index (#9750) @isVoid
• Update to UCX-Py 0.24 (#9748) @pentschev
• Skip cufile tests in JNI build script (#9744) @pxLi
• Enable string to decimal 128 cast (#9742) @razajafri
• Use stop instead of stop_. (#9735) @bdice
• Forward-merge branch-21.12 to branch-22.02 (#9730) @bdice
• Improve cmake format script (#9723) @vyasr
• Use cuFile direct device reads/writes by default in cuIO (#9722) @vuule
• Add directory-partitioned data support to cudf.read_parquet (#9720) @rjzamora
• Use stream allocator adaptor for hash join table (#9704) @PointKernel
• Update check for inf/nan strings in libcudf float conversion to ignore case (#9694) @davidwendt
• Update cudf JNI to 22.02.0-SNAPSHOT (#9681) @pxLi
• Replace cudf's concurrent_ordered_map with cuco::static_map in semi/anti joins (#9666) @vyasr
• Some improvements to parse_decimal function and bindings for is_fixed_point (#9658) @razajafri
• Add utility to format ninja-log build times (#9631) @davidwendt
• Allow runtime has_nulls parameter for row operators (#9623) @davidwendt
• Use fsspec.parquet for improved read_parquet performance from remote storage (#9589) @rjzamora
• Refactor bit counting APIs, introduce valid/null count functions, and split host/device side code for segmented counts. (#9588) @bdice
• Use List of Columns as Input for drop_nulls, gather and drop_duplicates (#9558) @isVoid
• Simplify merge internals and reduce overhead (#9516) @vyasr
• Add struct generation support in datagenerator & fuzz tests (#9180) @galipremsagar
• Simplify write_csv by removing unnecessary writer/impl classes (#9089) @cwharris

v21.12.02

v21.12.01

🚨 Breaking Changes

• Update bitmask_and and bitmask_or to return a pair of resulting mask and count of unset bits (#9616) @PointKernel
• Remove sizeof and standardize on memory_usage (#9544) @vyasr
• Add support for single-line regex anchors ^/$ in contains_re (#9482) @davidwendt
• Refactor sorting APIs (#9464) @vyasr
• Update Java nvcomp JNI bindings to nvcomp 2.x API (#9384) @jbrennan333
• Support Python UDFs written in terms of rows (#9343) @brandon-b-miller
• JNI: Support nested types in ORC writer (#9334) @firestarman
• Optionally nullify out-of-bounds indices in segmented_gather(). (#9318) @mythrocks
• Refactor cuIO timestamp processing with cuda::std::chrono (#9278) @PointKernel
• Various internal MultiIndex improvements (#9243) @vyasr

🐛 Bug Fixes

• Fix read_parquet bug for bytes input (#9669) @rjzamora
• Use _gather internal for sort_* (#9668) @isVoid
• Fix behavior of equals for non-DataFrame Frames and add tests. (#9653) @vyasr
• Dont recompute output size if it is already available (#9649) @abellina
• Fix read_parquet bug for extended dtypes from remote storage (#9638) @rjzamora
• add const when getting data from a JNI data wrapper (#9637) @wjxiz1992
• Fix debrotli issue on CUDA 11.5 (#9632) @vuule
• Use std::size_t when computing join output size (#9626) @jlowe
• Fix usecols parameter handling in dask_cudf.read_csv (#9618) @galipremsagar
• Add support for string 'nan', 'inf' & '-inf' values while type-casting to float (#9613) @galipremsagar
• Avoid passing NativeFileDatasource to pyarrow in read_parquet (#9608) @rjzamora
• Fix test failure with cuda 11.5 in row_bit_count tests. (#9581) @nvdbaranec
• Correct _LIBCUDACXX_CUDACC_VER value computation (#9579) @robertmaynard
• Increase max RLE stream size estimate to avoid potential overflows (#9568) @vuule
• Fix edge case in tdigest scalar generation for groups containing all nulls. (#9551) @nvdbaranec
• Fix pytests failing in cuda-11.5 environment (#9547) @galipremsagar
• compile libnvcomp with PTDS if requested (#9540) @jbrennan333
• Fix segmented_gather() for null LIST rows (#9537) @mythrocks
• Deprecate DataFrame.label_encoding, use private _label_encoding method internally. (#9535) @bdice
• Fix several test and benchmark issues related to bitmask allocations. (#9521) @nvdbaranec
• Fix for inserting duplicates in groupby result cache (#9508) @karthikeyann
• Fix mismatched types error in clip() when using non int64 numeric types (#9498) @davidwendt
• Match conda pinnings for style checks (revert part of #9412, #9433). (#9490) @bdice
• Make sure all dask-cudf supported aggs are handled in _tree_node_agg (#9487) @charlesbluca
• Resolve hash_columns FutureWarning in dask_cudf (#9481) @pentschev
• Add fixed point to AllTypes in libcudf unit tests (#9472) @karthikeyann
• Fix regex handling of embedded null characters (#9470) @davidwendt
• Fix memcheck error in copy-if-else (#9467) @davidwendt
• Fix bug in dask_cudf.read_parquet for index=False (#9453) @rjzamora
• Preserve the decimal scale when creating a default scalar (#9449) @revans2
• Push down parent nulls when flattening nested columns. (#9443) @mythrocks
• Fix memcheck error in gtest SegmentedGatherTest/GatherSliced (#9442) @davidwendt
• Revert "Fix quantile division / partition handling for dask-cudf sort… (#9438) @charlesbluca
• Allow int-like objects for the decimals argument in round (#9428) @shwina
• Fix stream compaction's drop_duplicates API to use stable sort (#9417) @ttnghia
• Skip Comparing Uniform Window Results in Var/std Tests (#9416) @isVoid
• Fix StructColumn.to_pandas type handling issues (#9388) @galipremsagar
• Correct issues in the build dir cudf-config.cmake (#9386) @robertmaynard
• Fix Java table partition test to account for non-deterministic ordering (#9385) @jlowe
• Fix timestamp truncation/overflow bugs in orc/parquet (#9382) @PointKernel
• Fix the crash in stats code (#9368) @devavret
• Make Series.hash_encode results reproducible. (#9366) @bdice
• Fix libcudf compile warnings on debug 11.4 build (#9360) @davidwendt
• Fail gracefully when compiling python UDFs that attempt to access columns with unsupported dtypes (#9359) @brandon-b-miller
• Set pass_filenames: false in mypy pre-commit configuration. (#9349) @bdice
• Fix cudf_assert in cudf::io::orc::gpu::gpuDecodeOrcColumnData (#9348) @davidwendt
• Fix memcheck error in groupby-tdigest get_scalar_minmax (#9339) @davidwendt
• Optimizations for cudf.concat when axis=1 (#9333) @galipremsagar
• Use f-string in join helper warning message. (#9325) @bdice
• Avoid casting to list or struct dtypes in dask_cudf.read_parquet (#9314) @rjzamora
• Fix null count in statistics for parquet (#9303) @devavret
• Potential overflow of decimal32 when casting to int64_t (#9287) @codereport
• Fix quantile division / partition handling for dask-cudf sort on null dataframes (#9259) @charlesbluca
• Updating cudf version also updates rapids cmake branch (#9249) @robertmaynard
• Implement one_hot_encoding in libcudf and bind to python (#9229) @isVoid
• BUG FIX: CSV Writer ignores the header parameter when no metadata is provided (#8740) @skirui-source

📖 Documentation

• Update Documentation to use TYPED_TEST_SUITE (#9654) @codereport
• Add dedicated page for StringHandling in python docs (#9624) @galipremsagar
• Update docstring of DataFrame.merge (#9572) @galipremsagar
• Use raw strings to avoid SyntaxErrors in parsed docstrings. (#9526) @bdice
• Add example to docstrings in rolling.apply (#9522) @isVoid
• Update help message to escape quotes in ./build.sh --cmake-args. (#9494) @bdice
• Improve Python docstring formatting. (#9493) @bdice
• Update table of I/O supported types (#9476) @vuule
• Document invalid regex patterns as undefined behavior (#9473) @davidwendt
• Miscellaneous documentation fixes to cudf (#9471) @galipremsagar
• Fix many documentation errors in libcudf. (#9355) @karthikeyann
• Fixing SubwordTokenizer docs issue (#9354) @mayankanand007
• Improved deprecation warnings. (#9347) @bdice
• doc reorder mr, stream to stream, mr (#9308) @karthikeyann
• Deprecate method parameters to DataFrame.join, DataFrame.merge. (#9291) @bdice
• Added deprecation warning for .label_encoding() (#9289) @mayankanand007

🚀 New Features

• Enable Series.divide and DataFrame.divide (#9630) @vyasr
• Update bitmask_and and bitmask_or to return a pair of resulting mask and count of unset bits (#9616) @PointKernel
• Add handling of mixed numeric types in to_dlpack (#9585) @galipremsagar
• Support re.Pattern object for pat arg in str.replace (#9573) @davidwendt
• Add JNI for lists::drop_list_duplicates with keys-values input column (#9553) @ttnghia
• Support structs column in min, max, argmin and argmax groupby aggregate() and scan() (#9545) @ttnghia
• Move libcudacxx to use rapids_cpm and use newer versions (#9539) @robertmaynard
• Add scan min/max support for chrono types to libcudf reduction-scan (not groupby scan) (#9518) @davidwendt
• Support args= in apply (#9514) @brandon-b-miller
• Add groupby scan min/max support for strings values (#9502) @davidwendt
• Add list output option to character_ngrams() function (#9499) @davidwendt
• More granular column selection in ORC reader (#9496) @vuule
• add min_periods, ddof to groupby covariance, & correlation aggregation (#9492) @karthikeyann
• Implement Series.datetime.floor (#9488) @skirui-source
• Enable linting of CMake files using pre-commit (#9484) @vyasr
• Add support for single-line regex anchors ^/$ in contains_re (#9482) @davidwendt
• Augment order_by to Accept a List of null_precedence (#9455) @isVoid
• Add format API for list column of strings (#9454) @davidwendt
• Enable Datetime/Timedelta dtypes in Masked UDFs (#9451) @brandon-b-miller
• Add cudf python groupby.diff (#9446) @karthikeyann
• Implement lists::stable_sort_lists for stable sorting of elements within each row of lists column (#9425) @ttnghia
• add ctest memcheck using cuda-sanitizer (#9414) @karthikeyann
• Support Unary Operations in Masked UDF (#9409) @isVoid
• Move Several Series Function to Frame (#9394) @isVoid
• MD5 Python hash API (#9390) @bdice
• Add cudf strings is_title API (#9380) @davidwendt
• Enable casting to int64, uint64, and double in AST code. (#9379) @vyasr
• Add support for writing ORC with map columns (#9369) @vuule
• extract_list_elements() with column_view indices (#9367) @mythrocks
• Reimplement lists::drop_list_duplicates for keys-values lists columns (#9345) @ttnghia
• Support Python UDFs written in terms of rows (#9343) @brandon-b-miller
• JNI: Support nested types in ORC writer (#9334) @firestarman
• Optionally nullify out-of-bounds indices in segmented_gather(). (#9318) @mythrocks
• Add shallow hash function and shallow equality comparison for column_view (#9312) @karthikeyann
• Add CudaMemoryBuffer for cudaMalloc memory using RMM cuda_memory_resource (#9311) @rongou
• Add parameters to control row index stride and stripe size in ORC writer (#9310) @vuule
• Add na_position param to dask-cudf sort_values (#9264) @charlesbluca
• Add ascending parameter for dask-cudf sort_values (#9250) @charlesbluca
• New array conversion methods (#9236) @vyasr
• Series apply method backed by masked UDFs (#9217) @brandon-b-miller
• Grouping by frequency and resampling (#9178) @shwina
• Pure-python masked UDFs (#9174) @brandon-b-miller
• Add Covariance, Pearson correlation for sort groupby (libcudf) (#9154) @karthikeyann
• Add calendrical_month_sequence in c++ and date_range in python (#8886) @shwina

🛠️ Improvements

• Followup to PR 9088 comments (#9659) @cwharris
• Update cuCollections to version that supports installed libcudacxx (#9633) @robertmaynard
• Add 11.5 dev.yml to cudf (#9617) @galipremsagar
• Add xfail for parquet reader 11.5 issue (#9612) @galipremsagar
• remove deprecated Rmm.initialize method (#9607) @rongou
• Use HostColumnVectorCore for child columns in JCudfSerialization.unpackHostColumnVectors (#9596) @sperlingxx
• Set RMM pool to a fixed size in JNI (#9583) @rongou
• Use nvCOMP for Snappy compression/decompression (#9582) @vuule
• Build CUDA version agnostic packages for dask-cudf (#9578) @Ethyling
• Fixed tests warning: "TYPED_TEST_CASE is deprecated, please use TYPED_TEST_SUITE" (#9574) @ttnghia
• Enable CMake format in CI and fix style (#9570) @vyasr
• Add NVTX Start/End Ranges to JNI (#9563) @abellina
• Add librdkafka and python-confluent-kafka to dev conda environments s… (#9562) @jdye64
• Add offsets_begin/end() to strings_column_view (#9559) @davidwendt
• remove alignment options for RMM jni (#9550) @rongou
• Add axis parameter passthrough to DataFrame and Series take for pandas API compatibility (#9549) @dantegd
• Remove sizeof and standardize on memory_usage (#9544) @vyasr
• Adds cudaProfilerStart/cudaProfilerStop in JNI api (#9543) @abellina
• Generalize comparison binary operations (#9542) @vyasr
• Expose APIs to wrap CUDA or RMM allocations with a Java device buffer instance (#9538) @jlowe
• Add scan sum support for duration types to libcudf (#9536) @davidwendt
• Force inlining to improve AST performance (#9530) @vyasr
• Generalize some more indexed frame methods (#9529) @vyasr
• Add Java bindings for rolling window stddev aggregation (#9527) @razajafri
• catch rmm::out_of_memory exceptions in jni (#9525) @rongou
• Add an overload of make_empty_column with type_id parameter (#9524) @ttnghia
• Accelerate conditional inner joins with larger right tables (#9523) @vyasr
• Initial pass of generalizing decimal support in cudf python layer (#9517) @galipremsagar
• Cleanup for flattening nested columns (#9509) @rwlee
• Enable running tests using RMM arena and async memory resources (#9506) @rongou
• Remove dependency on six. (#9495) @bdice
• Cleanup some libcudf strings gtests (#9489) @davidwendt
• Rename strings/array_tests.cu to strings/array_tests.cpp (#9480) @davidwendt
• Refactor sorting APIs (#9464) @vyasr
• Implement DataFrame.hash_values, deprecate DataFrame.hash_columns. (#9458) @bdice
• Deprecate Series.hash_encode. (#9457) @bdice
• Update conda recipes for Enhanced Compatibility effort (#9456) @ajschmidt8
• Small clean up to simplify column selection code in ORC reader (#9444) @vuule
• add missing stream to scalar.is_valid() wherever stream is available (#9436) @karthikeyann
• Adds Deprecation Warnings to one_hot_encoding and Implement get_dummies with Cython API (#9435) @isVoid
• Update pre-commit hook URLs. (#9433) @bdice
• Remove pyarrow import in dask_cudf.io.parquet (#9429) @charlesbluca
• Miscellaneous improvements for UDFs (#9422) @isVoid
• Use pre-commit for CI (#9412) @vyasr
• Update to UCX-Py 0.23 (#9407) @pentschev
• Expose OutOfBoundsPolicy in JNI for Table.gather (#9406) @abellina
• Improvements to tdigest aggregation code. (#9403) @nvdbaranec
• Add Java API to deserialize a table to host columns (#9402) @jlowe
• Frame copy to use class instead of type() (#9397) @madsbk
• Change all DeprecationWarnings to FutureWarning. (#9392) @bdice
• Update Java nvcomp JNI bindings to nvcomp 2.x API (#9384) @jbrennan333
• Add IndexedFrame class and move SingleColumnFrame to a separate module (#9378) @vyasr
• Support Arrow NativeFile and PythonFile for remote ORC storage (#9377) @rjzamora
• Use Arrow PythonFile for remote CSV storage (#9376) @rjzamora
• Add multi-threaded writing to GDS writes (#9372) @devavret
• Miscellaneous column cleanup (#9370) @vyasr
• Use single kernel to extract all groups in cudf::strings::extract (#9358) @davidwendt
• Consolidate binary ops into Frame (#9357) @isVoid
• Move rank scan implementations from scan_inclusive.cu to rank_scan.cu (#9351) @davidwendt
• Remove usage of deprecated thrust::host_space_tag. (#9350) @bdice
• Use Default Memory Resource for Temporaries in reduction.cpp (#9344) @isVoid
• Fix Cython compilation warnings. (#9327) @bdice
• Fix some unused variable warnings in libcudf (#9326) @davidwendt
• Use optional-iterator for copy-if-else kernel (#9324) @davidwendt
• Remove Table class (#9315) @vyasr
• Unpin dask and distributed in CI (#9307) @galipremsagar
• Add optional-iterator support to indexalator (#9306) @davidwendt
• Consolidate more methods in Frame (#9305) @vyasr
• Add Arrow-NativeFile and PythonFile support to read_parquet and read_csv in cudf (#9304) @rjzamora
• Pin mypy in .pre-commit-config.yaml to match conda environment pinning. (#9300) @bdice
• Use gather.hpp when gather-map exists in device memory (#9299) @davidwendt
• Fix Automerger for Branch-21.12 from branch-21.10 (#9285) @galipremsagar
• Refactor cuIO timestamp processing with cuda::std::chrono (#9278) @PointKernel
• Change strings copy_if_else to use optional-iterator instead of pair-iterator (#9266) @davidwendt
• Update cudf java bindings to 21.12.0-SNAPSHOT (#9248) @pxLi
• Various internal MultiIndex improvements (#9243) @vyasr
• Add detail interface for split and slice(table_view), refactors both function with host_span (#9226) @isVoid
• Refactor MD5 implementation. (#9212) @bdice
• Update groupby result_cache to allow sharing intermediate results based on column_view instead of requests. (#9195) @karthikeyann
• Use nvcomp's snappy decompressor in avro reader (#9181) @devavret
• Add isocalendar API support (#9169) @marlenezw
• Simplify read_json by removing unnecessary reader/impl classes (#9088) @cwharris
• Simplify read_csv by removing unnecessary reader/impl classes (#9041) @cwharris
• Refactor hash join with cuCollections multimap (#8934) @PointKernel

v21.10.01

🚨 Breaking Changes

• Remove Cython APIs for table view generation (#9199) @vyasr
• Upgrade pandas version in cudf (#9147) @galipremsagar
• Make AST operators nullable (#9096) @vyasr
• Remove the option to pass data types as strings to read_csv and read_json (#9079) @vuule
• Update JNI java CSV APIs to not use deprecated API (#9066) @revans2
• Support additional format specifiers in from_timestamps (#9047) @davidwendt
• Expose expression base class publicly and simplify public AST API (#9045) @vyasr
• Add support for struct type in ORC writer (#9025) @vuule
• Remove aliases of various api.types APIs from utils.dtypes. (#9011) @vyasr
• Java bindings for conditional join output sizes (#9002) @jlowe
• Move compute_column API out of ast namespace (#8957) @vyasr
• cudf.dtype function (#8949) @shwina
• Refactor Frame reductions (#8944) @vyasr
• Add nested column selection to parquet reader (#8933) @devavret
• JNI Aggregation Type Changes (#8919) @revans2
• Add groupby_aggregation and groupby_scan_aggregation classes and force their usage. (#8906) @nvdbaranec
• Expand CSV and JSON reader APIs to accept dtypes as a vector or map of data_type objects (#8856) @vuule
• Change cudf docs theme to pydata theme (#8746) @galipremsagar
• Enable compiled binary ops in libcudf, python and java (#8741) @karthikeyann
• Make groupby transform-like op order match original data order (#8720) @isVoid

🐛 Bug Fixes

• fixed_point cudf::groupby for mean aggregation (#9296) @codereport
• Fix interleave_columns when the input string lists column having empty child column (#9292) @ttnghia
• Update nvcomp to include fixes for installation of headers (#9276) @devavret
• Fix Java column leak in testParquetWriteMap (#9271) @jlowe
• Fix call to thrust::reduce_by_key in argmin/argmax libcudf groupby (#9263) @davidwendt
• Fixing empty input to getMapValue crashing (#9262) @hyperbolic2346
• Fix duplicate names issue in MultiIndex.deserialize (#9258) @galipremsagar
• Dataframe.sort_index optimizations (#9238) @galipremsagar
• Temporarily disabling problematic test in parquet writer (#9230) @devavret
• Explicitly disable groupby on unsupported key types. (#9227) @mythrocks
• Fix gather for sliced input structs column (#9218) @ttnghia
• Fix JNI code for left semi and anti joins (#9207) @jlowe
• Only install thrust when using a non 'system' version (#9206) @robertmaynard
• Remove zlib from libcudf public CMake dependencies (#9204) @robertmaynard
• Fix out-of-bounds memory read in orc gpuEncodeOrcColumnData (#9196) @davidwendt
• Fix gather() for STRUCT inputs with no nulls in members. (#9194) @mythrocks
• get_cucollections properly uses rapids_cpm_find (#9189) @robertmaynard
• rapids-export correctly reference build code block and doc strings (#9186) @robertmaynard
• Fix logic while parsing the sum statistic for numerical orc columns (#9183) @ayushdg
• Add handling for nulls in dask_cudf.sorting.quantile_divisions (#9171) @charlesbluca
• Approximate overflow detection in ORC statistics (#9163) @vuule
• Use decimal precision metadata when reading from parquet files (#9162) @shwina
• Fix variable name in Java build script (#9161) @jlowe
• Import rapids-cmake modules using the correct cmake variable. (#9149) @robertmaynard
• Fix conditional joins with empty left table (#9146) @vyasr
• Fix joining on indexes with duplicate level names (#9137) @shwina
• Fixes missing child column name in dtype while reading ORC file. (#9134) @rgsl888prabhu
• Apply type metadata after column is slice-copied (#9131) @isVoid
• Fix a bug: inner_join_size return zero if build table is empty (#9128) @PointKernel
• Fix multi hive-partition parquet reading in dask-cudf (#9122) @rjzamora
• Support null literals in expressions (#9117) @vyasr
• Fix cudf::hash_join output size for struct joins (#9107) @jlowe
• Import fix (#9104) @shwina
• Fix cudf::strings::is_fixed_point checking of overflow for decimal32 (#9093) @davidwendt
• Fix branch_stack calculation in row_bit_count() (#9076) @mythrocks
• Fetch rapids-cmake to work around cuCollection cmake issue (#9075) @jlowe
• Fix compilation errors in groupby benchmarks. (#9072) @nvdbaranec
• Preserve float16 upscaling (#9069) @galipremsagar
• Fix memcheck read error in libcudf contiguous_split (#9067) @davidwendt
• Add support for reading ORC file with no row group index (#9060) @rgsl888prabhu
• Various multiindex related fixes (#9036) @shwina
• Avoid rebuilding cython in build.sh (#9034) @brandon-b-miller
• Add support for percentile dispatch in dask_cudf (#9031) @galipremsagar
• cudf resolve nvcc 11.0 compiler crashes during codegen (#9028) @robertmaynard
• Fetch correct grouping keys agg of dask groupby (#9022) @galipremsagar
• Allow where() to work with a Series and other=cudf.NA (#9019) @sarahyurick
• Use correct index when returning Series from GroupBy.apply() (#9016) @charlesbluca
• Fix Dataframe indexer setitem when array is passed (#9006) @galipremsagar
• Fix ORC reading of files with struct columns that have null values (#9005) @vuule
• Ensure JNI native libraries load when CompiledExpression loads (#8997) @jlowe
• Fix memory read error in get_dremel_data in page_enc.cu (#8995) @davidwendt
• Fix memory write error in get_list_child_to_list_row_mapping utility (#8994) @davidwendt
• Fix debug compile error for csv_test.cpp (#8981) @davidwendt
• Fix memory read/write error in concatenate_lists_ignore_null (#8978) @davidwendt
• Fix concatenation of cudf.RangeIndex (#8970) @galipremsagar
• Java conditional joins should not require matching column counts (#8955) @jlowe
• Fix concatenate empty structs (#8947) @sperlingxx
• Fix cuda-memcheck errors for some libcudf functions (#8941) @davidwendt
• Apply series name to result of SeriesGroupby.apply() (#8939) @charlesbluca
• cdef packed_columns as cppclass instead of struct (#8936) @charlesbluca
• Inserting a cudf.NA into a DataFrame (#8923) @sarahyurick
• Support casting with Pandas dtype aliases (#8920) @sarahyurick
• Allow sort_values to accept same kind values as Pandas (#8912) @sarahyurick
• Enable casting to pandas nullable dtypes (#8889) @brandon-b-miller
• Fix libcudf memory errors (#8884) @karthikeyann
• Throw KeyError when accessing field from struct with nonexistent key (#8880) @NV-jpt
• replace auto with auto& ref for cast<&> (#8866) @karthikeyann
• Add missing include<optional> in binops (#8864) @karthikeyann
• Fix select_dtypes to work when non-class dtypes present in dataframe (#8849) @sarahyurick
• Re-enable JSON tests (#8843) @vuule
• Support header with embedded delimiter in csv writer (#8798) @davidwendt

📖 Documentation

• Add IO docs page in cudf documentation (#9145) @galipremsagar
• use correct namespace in cuio code examples (#9037) @cwharris
• Restructuring Contributing doc (#9026) @iskode
• Update stable version in readme (#9008) @galipremsagar
• Add spans and more include guidelines to libcudf developer guide (#8931) @harrism
• Update Java build instructions to mention Arrow S3 and Docker (#8867) @jlowe
• List GDS-enabled formats in the docs (#8805) @vuule
• Change cudf docs theme to pydata theme (#8746) @galipremsagar

🚀 New Features

• Revert "Add shallow hash function and shallow equality comparison for column_view (#9185)" (#9283) @karthikeyann
• Align DataFrame.apply signature with pandas (#9275) @brandon-b-miller
• Add struct type support for drop_list_duplicates (#9202) @ttnghia
• support CUDA async memory resource in JNI (#9201) @rongou
• Add shallow hash function and shallow equality comparison for column_view (#9185) @karthikeyann
• Superimpose null masks for STRUCT columns. (#9144) @mythrocks
• Implemented bindings for ceil timestamp operation (#9141) @shaneding
• Adding MAP type support for ORC Reader (#9132) @rgsl888prabhu
• Implement interleave_columns for lists with arbitrary nested type (#9130) @ttnghia
• Add python bindings to fixed-size window and groupby rolling.var, rolling.std (#9097) @isVoid
• Make AST operators nullable (#9096) @vyasr
• Java bindings for approx_percentile (#9094) @andygrove
• Add dseries.struct.explode (#9086) @isVoid
• Add support for BaseIndexer in Rolling APIs (#9085) @galipremsagar
• Remove the option to pass data types as strings to read_csv and read_json (#9079) @vuule
• Add handling for nested dicts in dask-cudf groupby (#9054) @charlesbluca
• Added Series.dt.is_quarter_start and Series.dt.is_quarter_end (#9046) @TravisHester
• Support nested types for nth_element reduction (#9043) @sperlingxx
• Update sort groupby to use non-atomic operation (#9035) @karthikeyann
• Add support for struct type in ORC writer (#9025) @vuule
• Implement interleave_columns for structs columns (#9012) @ttnghia
• Add groupby first and last aggregations (#9004) @shwina
• Add DecimalBaseColumn and move as_decimal_column (#9001) @isVoid
• Python/Cython bindings for multibyte_split (#8998) @jdye64
• Support scalar months in add_calendrical_months, extends API to INT32 support (#8991) @isVoid
• Added Series.dt.is_month_end (#8989) @TravisHester
• Support for using tdigests to compute approximate percentiles. (#8983) @nvdbaranec
• Support "unflatten" of columns flattened via flatten_nested_columns(): (#8956) @mythrocks
• Implement timestamp ceil (#8942) @shaneding
• Add nested column selection to parquet reader (#8933) @devavret
• Expose conditional join size calculation (#8928) @vyasr
• Support Nulls in Timeseries Generator (#8925) @isVoid
• Avoid index equality check in _CPackedColumns.from_py_table() (#8917) @charlesbluca
• Add dot product binary op (#8909) @charlesbluca
• Expose days_in_month function in libcudf and add python bindings (#8892) @isVoid
• Series string repeat (#8882) @sarahyurick
• Python binding for quarters (#8862) @shaneding
• Expand CSV and JSON reader APIs to accept dtypes as a vector or map of data_type objects (#8856) @vuule
• Add Java bindings for AST transform (#8846) @jlowe
• Series datetime is_month_start (#8844) @sarahyurick
• Support bracket syntax for cudf::strings::replace_with_backrefs group index values (#8841) @davidwendt
• Support VARIANCE and STD aggregation in rolling op (#8809) @isVoid
• Add quarters to libcudf datetime (#8779) @shaneding
• Linear Interpolation of nans via cupy (#8767) @brandon-b-miller
• Enable compiled binary ops in libcudf, python and java (#8741) @karthikeyann
• Make groupby transform-like op order match original data order (#8720) @isVoid
• multibyte_split (#8702) @cwharris
• Implement JNI for strings:repeat_strings that repeats each string separately by different numbers of times (#8572) @ttnghia

🛠️ Improvements

• Pin max dask and distributed versions to 2021.09.1 (#9286) @galipremsagar
• Optimized fsspec data transfer for remote file-systems (#9265) @rjzamora
• Skip dask-cudf tests on arm64 (#9252) @Ethyling
• Use nvcomp's snappy compressor in ORC writer (#9242) @devavret
• Only run imports tests on x86_64 (#9241) @Ethyling
• Remove unnecessary call to device_uvector::release() (#9237) @harrism
• Use nvcomp's snappy decompression in ORC reader (#9235) @devavret
• Add grouped_rolling test with STRUCT groupby keys. (#9228) @mythrocks
• Optimize cudf.concat for axis=0 (#9222) @galipremsagar
• Fix some libcudf calls not passing the stream parameter (#9220) @davidwendt
• Add min and max bounds for random dataframe generator numeric types (#9211) @galipremsagar
• Improve performance of expression evaluation (#9210) @vyasr
• Misc optimizations in cudf (#9203) @galipremsagar
• Remove Cython APIs for table view generation (#9199) @vyasr
• Add JNI support for drop_list_duplicates (#9198) @revans2
• Update pandas versions in conda recipes and requirements.txt files (#9197) @galipremsagar
• Minor C++17 cleanup of groupby.cu: structured bindings, more concise lambda, etc (#9193) @codereport
• Explicit about bitwidth difference between cudf boolean and arrow boolean (#9192) @isVoid
• Remove _source_index from MultiIndex (#9191) @vyasr
• Fix typo in the name of cudf-testing-targets.cmake (#9190) @trxcllnt
• Add support for single-digits in cudf::to_timestamps (#9173) @davidwendt
• Fix cufilejni build include path (#9168) @pxLi
• dask_cudf dispatch registering cleanup (#9160) @galipremsagar
• Remove unneeded stream/mr from a cudf::make_strings_column (#9148) @davidwendt
• Upgrade pandas version in cudf (#9147) @galipremsagar
• make data chunk reader return unique_ptr (#9129) @cwharris
• Add backend for percentile_lookup dispatch (#9118) @galipremsagar
• Refactor implementation of column setitem (#9110) @vyasr
• Fix compile warnings found using nvcc 11.4 (#9101) @davidwendt
• Update to UCX-Py 0.22 (#9099) @pentschev
• Simplify read_avro by removing unnecessary writer/impl classes (#9090) @cwharris
• Allowing %f in format to return nanoseconds (#9081) @marlenezw
• Java bindings for cudf::hash_join (#9080) @jlowe
• Remove stale code in ColumnBase._fill (#9078) @isVoid
• Add support for get_group in GroupBy (#9070) @galipremsagar
• Remove remaining "support" methods from DataFrame (#9068) @vyasr
• Update JNI java CSV APIs to not use deprecated API (#9066) @revans2
• Added method to remove null_masks if the column has no nulls (#9061) @razajafri
• Consolidate Several Series and Dataframe Methods (#9059) @isVoid
• Remove usage of string based set_dtypes for csv & json readers (#9049) @galipremsagar
• Remove some debug print statements from gtests (#9048) @davidwendt
• Support additional format specifiers in from_timestamps (#9047) @davidwendt
• Expose expression base class publicly and simplify public AST API (#9045) @vyasr
• move filepath and mmap logic out of json/csv up to functions.cpp (#9040) @cwharris
• Refactor Index hierarchy (#9039) @vyasr
• cudf now leverages rapids-cmake to reduce CMake boilerplate (#9030) @robertmaynard
• Add support for STRUCT input to groupby (#9024) @mythrocks
• Refactor Frame scans (#9021) @vyasr
• Remove duplicate set_categories code (#9018) @isVoid
• Map support for ParquetWriter (#9013) @razajafri
• Remove aliases of various api.types APIs from utils.dtypes. (#9011) @vyasr
• Java bindings for conditional join output sizes (#9002) @jlowe
• Remove _copy_construct factory (#8999) @vyasr
• ENH Allow arbitrary CMake config options in build.sh (#8996) @dillon-cullinan
• A small optimization for JNI copy column view to column vector (#8985) @revans2
• Fix nvcc warnings in ORC writer (#8975) @devavret
• Support nested structs in rank and dense rank (#8962) @rwlee
• Move compute_column API out of ast namespace (#8957) @vyasr
• Series datetime is_year_end and is_year_start (#8954) @marlenezw
• Make Java AstNode public (#8953) @jlowe
• Replace allocate with device_uvector for subword_tokenize internal tables (#8952) @davidwendt
• cudf.dtype function (#8949) @shwina
• Refactor Frame reductions (#8944) @vyasr
• Add deprecation warning for Series.set_mask API (#8943) @galipremsagar
• Move AST evaluator into a separate header (#8930) @vyasr
• JNI Aggregation Type Changes (#8919) @revans2
• Move template parameter to function parameter in cudf::detail::left_semi_anti_join (#8914) @davidwendt
• Upgrade arrow & pyarrow to 5.0.0 (#8908) @galipremsagar
• Add groupby_aggregation and groupby_scan_aggregation classes and force their usage. (#8906) @nvdbaranec
• Move structs_column_tests.cu to .cpp. (#8902) @mythrocks
• Add stream and memory-resource parameters to struct-scalar copy ctor (#8901) @davidwendt
• Combine linearizer and ast_plan (#8900) @vyasr
• Add Java bindings for conditional join gather maps (#8888) @jlowe
• Remove max version pin for dask & distributed on development branch (#8881) @galipremsagar
• fix cufilejni build w/ c++17 (#8877) @pxLi
• Add struct accessor to dask-cudf (#8874) @NV-jpt
• Migrate dask-cudf CudfEngine to leverage ArrowDatasetEngine (#8871) @rjzamora
• Add JNI for extract_quarter, add_calendrical_months, and is_leap_year (#8863) @revans2
• Change cudf::scalar copy and move constructors to protected (#8857) @davidwendt
• Replace is_same<>::value with is_same_v<> (#8852) @codereport
• Add min pytorch version to importorskip in pytest (#8851) @galipremsagar
• Java bindings for regex replace (#8847) @jlowe
• Remove make strings children with null mask (#8830) @davidwendt
• Refactor conditional joins (#8815) @vyasr
• Small cleanup (unused headers / commented code removals) (#8799) @codereport
• ENH Replace gpuci_conda_retry with gpuci_mamba_retry (#8770) @dillon-cullinan
• Update cudf java bindings to 21.10.0-SNAPSHOT (#8765) @pxLi
• Refactor and improve join benchmarks with nvbench (#8734) @PointKernel
• Refactor Python factories and remove usage of Table for libcudf output handling (#8687) @vyasr
• Optimize URL Decoding (#8622) @gaohao95
• Parquet writer dictionary encoding refactor (#8476) @devavret
• Use nvcomp's snappy decompression in parquet reader (#8252) @devavret
• Use nvcomp's snappy compressor in parquet writer (#8229) @devavret

v21.08.03

v21.08.02