Tom Lane 0a87ddff5c Cache the result of converting now() to a struct pg_tm. ... SQL operations such as CURRENT_DATE, CURRENT_TIME, LOCALTIME, and conversion of "now" in a datetime input string have to obtain the transaction start timestamp ("now()") as a broken-down struct pg_tm. This is a remarkably expensive conversion, and since now() does not change intra-transaction, it doesn't really need to be done more than once per transaction. Introducing a simple cache provides visible speedups in queries that compute these values many times, for example insertion of many rows that use a default value of CURRENT_DATE. Peter Smith, with a bit of kibitzing by me Discussion: https://postgr.es/m/CAHut+Pu89TWjq530V2gY5O6SWi=OEJMQ_VHMt8bdZB_9JFna5A@mail.gmail.com		2020-09-28 12:05:03 -04:00
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catalog	Minor mop-up for List improvements.	2020-09-27 22:30:52 -04:00
commands	Minor mop-up for List improvements.	2020-09-27 22:30:52 -04:00
executor	Move resolution of AlternativeSubPlan choices to the planner.	2020-09-27 12:51:28 -04:00
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replication	Fix the logical replication from HEAD to lower versions.	2020-09-26 10:13:51 +05:30
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tcop	Fix bogus completion tag usage in walsender	2020-09-16 21:16:25 -03:00
tsearch
utils	Cache the result of converting now() to a struct pg_tm.	2020-09-28 12:05:03 -04:00
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