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If the old row has any "missing" attributes that are supposed to be retrieved from an associated tuple descriptor, the wrong things happened because the trigger result is shoved directly into an executor slot that lacks the missing-attribute data. Notably, CHECK-constraint verification would incorrectly see those columns as NULL, and so would RETURNING-list evaluation. Band-aid around this by forcibly expanding the tuple before passing it to the trigger function. (IMO it was a fundamental misdesign to put the missing-attribute data into tuple constraints, which so much of the system considers to be optional. But we're probably stuck with that now, and will have to continue to apply band-aids as we find other places with similar issues.) Back-patch to v12. v11 would also have the issue, except that commit 920311ab1 already applied a similar band-aid. That forced expansion in more cases than seem really necessary, though, so this isn't a directly equivalent fix. Amit Langote, with some cosmetic changes by me Discussion: https://postgr.es/m/16644-5da7ef98a7ac4545@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