Discount the metapage when estimating number of index pages visited.

aio: Stop using enum bitfields due to bad code generation

aio: Add missing memory barrier when waiting for IO handle

Use pg_assume() to avoid compiler warning below exec_set_found()

Add pg_assume(expr) macro

Improve error report for PL/pgSQL reserved word used as a field name.

De-reserve keywords EXECUTE and STRICT in PL/pgSQL.

plpython: Remove obsolete test expected file

Bump the minimum supported Python version to 3.6.8

oauth: Support Python 3.6 in tests

Don't use a tuplestore if we don't have to for SQL-language functions.

Don't use a tuplestore if we don't have to for SQL-language functions.

Allocate JsonLexContexts on the heap to avoid warnings

Remove assertion based on pending_since in pgstat_report_stat()