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Postgres has traditionally considered the syntactic forms f(x) and x.f to be equivalent, allowing tricks such as writing a function and then using it as though it were a computed-on-demand column. However, our behavior when both interpretations are feasible left something to be desired: we always chose the column interpretation. This could lead to very surprising results, as in a recent bug report from Neil Conway. It also created a dump-and-reload hazard, since what was a function call in a dumped view could get interpreted as a column reference at reload, if a matching column name had been added to the underlying table since the view was created. What seems better, in ambiguous situations, is to prefer the choice matching the syntactic form of the reference. This seems much less astonishing in general, and it fixes the dump/reload hazard. Although this could be called a bug fix, there have been few complaints and there's some small risk of breaking applications that depend on the old behavior, so no back-patch. It does seem reasonable to slip it into v11, though. Discussion: https://postgr.es/m/CAOW5sYa3Wp7KozCuzjOdw6PiOYPi6D=VvRybtH2S=2C0SVmRmA@mail.gmail.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