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If a PlaceHolderVar is to be evaluated at a join relation, but its value is only needed there and not at higher levels, we neglected to update the joinrel's direct_lateral_relids to include the PHV's source rel. This causes problems because join_is_legal() then won't allow joining the joinrel to the PHV's source rel at all, leading to "failed to build any N-way joins" planner failures. Per report from Andreas Seltenreich. Back-patch to 9.5 where the problem originated. Discussion: https://postgr.es/m/87blfgqa4t.fsf@aurora.ydns.eu
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 (but see also below) examples/ Demonstration programs for libpq that double as regression tests via "make check" isolation/ Tests for concurrent behavior at the SQL level kerberos/ Tests for Kerberos/GSSAPI authentication and encryption ldap/ Tests for LDAP-based authentication 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