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SubPlan nodes are typically built very early, before any RelOptInfos have been constructed for the parent query level. As a result, the simple_rel_array in the parent root has not yet been initialized. Currently, during cost estimation of a SubPlan's testexpr, we may call examine_variable() to look up statistical data about the expressions. This can lead to "no relation entry for relid" errors. To fix, pass root as NULL to cost_qual_eval() in cost_subplan(), since the root does not yet contain enough information to safely consult statistics. One exception is SubPlan nodes built for the initplans of MIN/MAX aggregates from indexes. In this case, having a NULL root is safe because testexpr will be NULL. Additionally, an initplan will by definition not consult anything from the parent plan. Backpatch to all supported branches. Although the reported call path that triggers this error is not reachable prior to v17, there's no guarantee that other code paths -- especially in extensions -- could not encounter the same issue when cost_qual_eval() is called with a root that lacks a valid simple_rel_array. The test case is not included in pre-v17 branches though. Bug: #19037 Reported-by: Alexander Lakhin <exclusion@gmail.com> Diagnosed-by: Tom Lane <tgl@sss.pgh.pa.us> Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/19037-3d1c7bb553c7ce84@postgresql.org Backpatch-through: 13 |
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| isolation | ||
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| ldap | ||
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| recovery | ||
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| README | ||
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