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Andres Freund 42750b08d9 Ensure snapshot is registered within ScanPgRelation(). ... In 9.4 I added support to use a historical snapshot in ScanPgRelation(), while adding logical decoding. Unfortunately a conflict with the concurrent removal of SnapshotNow was incorrectly resolved, leading to an unregistered snapshot being used. It is not correct to use an unregistered (or non-active) snapshot for anything non-trivial, because catalog invalidations can cause the snapshot to be invalidated. Luckily it seems unlikely to actively cause problems in practice, as ScanPgRelation() requires that we already have a lock on the relation, we only look for a single row, and we don't appear to rely on the result's tid to be correct. It however is clearly wrong and potential negative consequences would likely be hard to find. So it seems worth backpatching the fix, even without a concrete hazard. Discussion: https://postgr.es/m/20200229052459.wzhqnbhrriezg4v2@alap3.anarazel.de Backpatch: 9.5-		6 years ago
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backend	Ensure snapshot is registered within ScanPgRelation().	6 years ago
bin	Enable Unix-domain sockets support on Windows	6 years ago
common	Add support for other normal forms to Unicode normalization API	6 years ago
fe_utils	Fix bug in pg_basebackup -F plain -R.	6 years ago
include	Enable Unix-domain sockets support on Windows	6 years ago
interfaces	Fix issues around .pgpass file.	6 years ago
makefiles	Remove libpq.rc, use win32ver.rc for libpq	6 years ago
pl	Rearrange validity checks for plpgsql "simple" expressions.	6 years ago
port	Fix our getopt_long's behavior for a command line argument of just "-".	6 years ago
template	Fix compiler warning for ppoll() on Cygwin	6 years ago
test	Improve the performance and accuracy of numeric sqrt() and ln().	6 years ago
timezone	Require stdint.h	6 years ago
tools	Enable Unix-domain sockets support on Windows	6 years ago
tutorial	Update copyrights for 2020	6 years ago
.gitignore	…
DEVELOPERS	…
Makefile	…
Makefile.global.in	Add PostgreSQL home page to --help output	6 years ago
Makefile.shlib	Add PostgreSQL home page to --help output	6 years ago
nls-global.mk	NLS: Fix backend gettext triggers	6 years ago