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The previous coding just ignored pruning constraints that compare a partition key to a null-valued expression. This is silly, since really what we can do there is conclude that all partitions are rejected: the pruning operator is known strict so the comparison must always fail. This also fixes the logic to not ignore constisnull for a Const comparison value. That's probably an unreachable case, since the planner would normally have simplified away a strict operator with a constant-null input. But this code has no business assuming that. David Rowley, per a gripe from me Discussion: https://postgr.es/m/26279.1528670981@sss.pgh.pa.us
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