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It failed if passed a nonexistent relation OID, or one that was a non-heap relation, because of blindly applying heap_open to a user-supplied OID. This is not OK behavior for a SQL-exposed function; we have a project policy that we should return NULL in such cases. Moreover, since pg_get_partition_constraintdef ought now to work on indexes, restricting it to heaps is flat wrong anyway. The underlying function generate_partition_qual() wasn't on board with indexes having partition quals either, nor for that matter with rels having relispartition set but yet null relpartbound. (One wonders whether the person who wrote the function comment blocks claiming that these functions allow a missing relpartbound had ever tested it.) Fix by testing relispartition before opening the rel, and by using relation_open not heap_open. (If any other relkinds ever grow the ability to have relispartition set, the code will work with them automatically.) Also, don't reject null relpartbound in generate_partition_qual. Back-patch to v11, and all but the null-relpartbound change to v10. (It's not really necessary to change generate_partition_qual at all in v10, but I thought s/heap_open/relation_open/ would be a good idea anyway just to keep the code in sync with later branches.) Per report from Justin Pryzby. Discussion: https://postgr.es/m/20180927200020.GJ776@telsasoft.com
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