David Rowley d37aa3d358 Allow nodeSort to perform Datum sorts for byref types ... Here we add a new 'copy' parameter to tuplesort_getdatum so that we can instruct the function not to datumCopy() byref Datums before returning. Similar to 91e9e89dc, this can provide significant performance improvements in nodeSort when sorting by a single byref column and the sort's targetlist contains only that column. This allows us to re-enable Datum sorts for byref types which was disabled in 3a5817695 due to a reported memory leak. Additionally, here we slightly optimize DISTINCT aggregates so that we no longer perform any datumCopy() when we find the current value not to be distinct from the previous value. Previously the code would always take a copy of the most recent Datum and pfree the previous value, even when the values were the same. Testing shows a small but noticeable performance increase when aggregate transitions are skipped due to the current transition value being the same as the prior one. Author: David Rowley Discussion: https://postgr.es/m/CAApHDvqS6wC5U==k9Hd26E4EQXH3QR67-T4=Q1rQ36NGvjfVSg@mail.gmail.com Discussion: https://postgr.es/m/CAApHDvqHonfe9G1cVaKeHbDx70R_zCrM3qP2AGXpGrieSKGnhA@mail.gmail.com		2022-10-28 09:25:12 +13:00
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brin	Rename shadowed local variables	2022-10-05 21:01:41 +13:00
common	meson: Add initial version of meson based build system	2022-09-21 22:37:17 -07:00
gin	Fix ordering issue with WAL operations in GIN fast insert path	2022-10-13 09:31:57 +09:00
gist	Remove unnecessary uses of Abs()	2022-10-07 13:29:33 +02:00
hash	meson: Add initial version of meson based build system	2022-09-21 22:37:17 -07:00
heap	Allow nodeSort to perform Datum sorts for byref types	2022-10-28 09:25:12 +13:00
index	meson: Add initial version of meson based build system	2022-09-21 22:37:17 -07:00
nbtree	meson: Add initial version of meson based build system	2022-09-21 22:37:17 -07:00
rmgrdesc	Revert 56-bit relfilenode change and follow-up commits.	2022-09-28 09:55:28 -04:00
spgist	meson: Add initial version of meson based build system	2022-09-21 22:37:17 -07:00
table	meson: Add initial version of meson based build system	2022-09-21 22:37:17 -07:00
tablesample	meson: Add initial version of meson based build system	2022-09-21 22:37:17 -07:00
transam	Update outdated comment for TransactionIdSetTreeStatus	2022-10-25 21:43:52 +02:00
Makefile	Introduce access/{table.h, relation.h}, for generic functions from heapam.h.	2019-01-21 10:51:36 -08:00
meson.build	meson: Add initial version of meson based build system	2022-09-21 22:37:17 -07:00