plpgsql_check

• fix another crash related unexpected order of fmgr hook calls

• fix crash in profiler when parameter of EXECUTE is empty string

• fix crash when plpgsql_check is used on anonymous code block

fix possibly crash when a plan is created by plpgsql, then plancache
is invalidated (due sinval), and same plan is created by plpgsql_check
in passive mode.

• fix crash when pragma assert-column is not correctly used

• fix crash related to active cursor leak detection and ending transaction inside procedure

• fix another crash related to constant tracing

• fix false alarm related to bug in trace constant in format function (when positional placeholder was used)

• fix false alarm of unclosed cursors test

• fix missing invalidation of traced constant when SELECT INTO command is used
• add pragmas for better check of identifiers used by dynamic SQL (assert-schema, assert-table, assert-column)

• possibility to detect unclosed cursors (runtime)

• fix crash when argument of EXECUTE is empty string (it is allowed possibility)
• fix crash when the checked plan is not valid (now, the invalid plan is replaned)
• tracer shows transaction nesting level (increased by using subtransactions)
• tracer can show number of subxids up to 64 (after this value there can be significant slowdown)

• fix crash when SRF function is used in expression

• add new option constants_tracing (true by default) for controling of possibility to trace constants

• fix usage of prev_needs_fmgr_hook
• warning when tracer is activated, but it is not enabled by superuser

• fix pldbgapi2 to correctly process empty exception handler

• allows to install plpgsql_check from plpgsql

• fix collision of global variable names with global variables from pglogical extension

• change signature of profiler/tracer control functions
• fix issues #149, #150 in profiler

• remove support for PostgreSQL 10 and 11
• significant refactoring (code cleaning) of profiler and tracer
• no new functionality, just code cleaning and remove obsolete code