Align random test function parameters in test_bitmapset

Fix incorrect nmembers calculation in test_bitmapset

Tidy up datatype usage in test_random_offset_operations()

Introduce bms_offset_members() function

Tighten up TS dictionary cache entry creation.

Fix memory-safety bugs in the ispell/hunspell dictionary loader.

Don't assume DISTINCT ON implies uniqueness when the tlist has SRFs

Allow an aggregate's planner support function to be set via CREATE AGGREGATE.

postgres_fdw: Rename option "restore_stats" to "import_stats".

Further cleanup for commit 54cd6fc83.

postgres_fdw: Mark statistics import helpers as static

postgres_fdw: Remove SPI from postgresImportForeignStatistics.

Retire execdebug.h and its debugging facility

Attempt to stabilize plan of self-join test in tidscan.sql

pg_locale.c: add explanatory comments.

Add C test function for pg_locale.h APIs.

Ensure all pg_locale.h APIs work with collate_is_c.

pg_locale.c, unicode_case.c: use size_t for iteration.

pg_locale.c: comment improvements.

Micro-optimize appendStringInfo[VA].

Replace formatting.c's fixed-size output buffers with StringInfos.

Restructure formatting.c's NUM_processor() to add some const-sanity.

Convert DCH_to_char() to use a StringInfo as destination.

Remove PG_MMAP_FLAGS from mem.h

Improve InitShmemAccess() prototype

Revert "Add GROUP BY ALL".