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If an expression containing an aggregate is evaluated above the plan node that computes the aggregate, as happens with window functions or with expressions postponed to above the final sort, setrefs.c replaces the Aggref or WindowFunc with a Var referencing the lower node's output. For SQL/JSON aggregates such as JSON_ARRAYAGG and JSON_OBJECTAGG, deparsing the containing JsonConstructorExpr then failed with "invalid JsonConstructorExpr underlying node type", since get_json_agg_constructor() did not expect a Var there. Fix by resolving the Var back to the underlying Aggref or WindowFunc and deparsing the constructor as if the aggregate were computed at the current node. The JsonConstructorExpr retains the RETURNING clause and the ABSENT/NULL ON NULL and WITH UNIQUE options, and the arguments come from the resolved aggregate, so the original JSON aggregate syntax is reproduced in full. This mirrors how get_agg_expr() already looks through such a Var when deparsing a combining aggregate. Reported-by: Thom Brown <thom@linux.com> Author: Richard Guo <guofenglinux@gmail.com> Discussion: https://postgr.es/m/CAA-aLv5QYTaMOk=Qhv6cgwceeHETZV8YJvWZ_rH+yVZCuchATA@mail.gmail.com Backpatch-through: 16
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