Add tests for nbtree empty index predicate locking.

Fix another empty nbtree index SSI race.

Fix race in SSI interaction with empty btrees.

Fix race in SSI interaction with gin fast path.

Fix race in SSI interaction with bitmap heap scan.

Fix race conditions with drop of reused pgstats entries

Prevent inconsistent use of stats entry for replication slots

Fix handling of errors in libpq pipelines

doc: clarify handling of time zones with "time with time zone"

Correct assertion and comments about XLogRecordMaxSize.

Fix edge-case for xl_tot_len broken by bae868ca.

Don't use Perl pack('Q') in 039_end_of_wal.pl.

Don't trust unvalidated xl_tot_len.

Make recovery report error message when invalid page header is found.

Improve description of keys in tsvector

Fix out-of-bound read in gtsvector_picksplit()