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makeDependencyGraphWalker thought that only SelectStmt nodes could contain a WithClause. Which was true in our original implementation of WITH, but astonishingly we missed updating this code when we added the ability to attach WITH to INSERT/UPDATE/DELETE (and later MERGE). Moreover, since it was coded to deliberately block recursion to a WithClause, even updating raw_expression_tree_walker didn't save it. The upshot of this was that we didn't see references to outer CTE names appearing within an inner WITH, and would neither complain about disallowed recursion nor account for such references when sorting CTEs into a usable order. The lack of complaints about this is perhaps not so surprising, because typical usage of WITH wouldn't hit either case. Still, it's pretty broken; failing to detect recursion here leads to assert failures or worse later on. Fix by factoring out the processing of sub-WITHs into a new function WalkInnerWith, and invoking that for all the statement types that can have WITH. Bug: #18878 Reported-by: Yu Liang <luy70@psu.edu> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18878-a26fa5ab6be2f2cf@postgresql.org Backpatch-through: 13
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