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The right mix of DDL and VACUUM could corrupt a catalog page header such that PageIsVerified() durably fails, requiring a restore from backup. This affects only catalogs that both have a syscache and have DDL code that uses syscache tuples to construct updates. One of the test permutations shows a variant not yet fixed. This makes !TransactionIdIsValid(TM_FailureData.xmax) possible with TM_Deleted. I think core and PGXN are indifferent to that. Per bug #17821 from Alexander Lakhin. Back-patch to v13 (all supported versions). The test case is v17+, since it uses INJECTION_POINT. Discussion: https://postgr.es/m/17821-dd8c334263399284@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 (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