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Tom Lane d243bf77c2 Fix constant-folding of ROW(...) IS [NOT] NULL with composite fields. ... The SQL standard appears to specify that IS [NOT] NULL's tests of field nullness are non-recursive, ie, we shouldn't consider that a composite field with value ROW(NULL,NULL) is null for this purpose. ExecEvalNullTest got this right, but eval_const_expressions did not, leading to weird inconsistencies depending on whether the expression was such that the planner could apply constant folding. Also, adjust the docs to mention that IS [NOT] DISTINCT FROM NULL can be used as a substitute test if a simple null check is wanted for a rowtype argument. That motivated reordering things so that IS [NOT] DISTINCT FROM is described before IS [NOT] NULL. In HEAD, I went a bit further and added a table showing all the comparison-related predicates. Per bug #14235. Back-patch to all supported branches, since it's certainly undesirable that constant-folding should change the semantics. Report and patch by Andrew Gierth; assorted wordsmithing and revised regression test cases by me. Report: <20160708024746.1410.57282@wrigleys.postgresql.org>		10 years ago
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backend	Fix constant-folding of ROW(...) IS [NOT] NULL with composite fields.	10 years ago
bin	Increase fixed waits in "pg_ctl start -w" from 5 seconds to 10.	10 years ago
include	Clarify documentation of ceil/ceiling/floor functions.	10 years ago
interfaces	Stamp 9.1.22.	10 years ago
makefiles	Don't use deprecated dllwrap on Cygwin.	12 years ago
pl	Make pltcl regression tests safe for Danish locale.	10 years ago
port	Stamp 9.1.22.	10 years ago
template	AIX: Test the -qlonglong option before use.	11 years ago
test	Fix constant-folding of ROW(...) IS [NOT] NULL with composite fields.	10 years ago
timezone	Sync back-branch copies of the timezone code with IANA release tzcode2016c.	10 years ago
tools	Fix MSVC build for changes in zic.	10 years ago
tutorial	Remove tabs after spaces in C comments	12 years ago
.gitignore	Convert cvsignore to gitignore, and add .gitignore for build targets.	16 years ago
DEVELOPERS	Replace a couple of references to files that no longer exist in the source	17 years ago
Makefile	Fix some oversights in distprep and maintainer-clean targets.	15 years ago
Makefile.global.in	Make numeric form of PG version number readily available in Makefiles.	11 years ago
Makefile.shlib	Make the AIX case of Makefile.shlib safe for parallel make.	10 years ago
bcc32.mak	Remove useless whitespace at end of lines	16 years ago
nls-global.mk	nls-global.mk: search build dir for source files, too	10 years ago
win32.mak	Remove useless whitespace at end of lines	16 years ago