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Commit 499be013d added this field in a rather poorly-thought-through manner, with the result being that rather than being a field of the Append or MergeAppend plan node as intended (and as it seems to be, in text format), it was actually an element of the "Plans" subgroup. At least in JSON format, that's flat out invalid syntax, because "Plans" is an array not an object. While it's not hard to move the generation of the field so that it appears where it's supposed to, this does result in a visible change in field order in text format, in cases where a Append or MergeAppend plan node has any InitPlans attached. That's slightly annoying to do in stable branches; but the alternative of continuing to emit broken non-text formats seems worse. Also, since the set of fields emitted is not supposed to be data-dependent in non-text formats, make sure that "Subplans Removed" appears in Append and MergeAppend nodes even when it's zero, in those formats. (The previous coding made it look like it could appear in some other node types such as BitmapAnd, but we don't actually support runtime pruning there, so don't emit it in those cases.) Per bug #16171 from Mahadevan Ramachandran. Fix by Daniel Gustafsson and Tom Lane, reviewed by Hamid Akhtar. Back-patch to v11 where this code came in. Discussion: https://postgr.es/m/16171-b72259ab75505fa2@postgresql.org
PostgreSQL tests ================ This directory contains a variety of test infrastructure as well as some of the tests in PostgreSQL. Not all tests are here -- in particular, there are more in individual contrib/ modules and in src/bin. Not all these tests get run by "make check". Check src/test/Makefile to see which tests get run automatically. authentication/ Tests for authentication examples/ Demonstration programs for libpq that double as regression tests via "make check" isolation/ Tests for concurrent behavior at the SQL level locale/ Sanity checks for locale data, encodings, etc mb/ Tests for multibyte encoding (UTF-8) support modules/ Extensions used only or mainly for test purposes, generally not suitable for installing in production databases perl/ Infrastructure for Perl-based TAP tests recovery/ Test suite for recovery and replication regress/ PostgreSQL's main regression test suite, pg_regress ssl/ Tests to exercise and verify SSL certificate handling subscription/ Tests for logical replication thread/ A thread-safety-testing utility used by configure