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Buildfarm results show that the modern POSIX rule that 1 ^ NaN = 1 is not honored on *BSD until relatively recently, and really old platforms don't believe that NaN ^ 0 = 1 either. (This is unsurprising, perhaps, since SUSv2 doesn't require either behavior.) In hopes of getting to platform independent behavior, let's deal with all the NaN-input cases explicitly in dpow(). Note that numeric_power() doesn't know either of these special cases. But since that behavior is platform-independent, I think it should be addressed separately, and probably not back-patched. Discussion: https://postgr.es/m/75DB81BEEA95B445AE6D576A0A5C9E936A73E741@BPXM05GP.gisp.nec.co.jp
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