Tom Lane 2debceed29 YA attempt at taming worst-case behavior of get_actual_variable_range. ... We've made multiple attempts at preventing get_actual_variable_range from taking an unreasonable amount of time (3ca930fc3, fccebe421). But there's still an issue for the very first planning attempt after deletion of a large number of extremal-valued tuples. While that planning attempt will set "killed" bits on the tuples it visits and thereby reduce effort for next time, there's still a lot of work it has to do to visit the heap and then set those bits. It's (usually?) not worth it to do that much work at plan time to have a slightly better estimate, especially in a context like this where the table contents are known to be mutating rapidly. Therefore, let's bound the amount of work to be done by giving up after we've visited 100 heap pages. Giving up just means we'll fall back on the extremal value recorded in pg_statistic, so it shouldn't mean that planner estimates suddenly become worthless. Note that this means we'll still gradually whittle down the problem by setting a few more index "killed" bits in each planning attempt; so eventually we'll reach a good state (barring further deletions), even in the absence of VACUUM. Simon Riggs, per a complaint from Jakub Wartak (with cosmetic adjustments by me). Back-patch to all supported branches. Discussion: https://postgr.es/m/CAKZiRmznOwi0oaV=4PHOCM4ygcH4MgSvt8=5cu_vNCfc8FSUug@mail.gmail.com		2022-11-22 14:40:44 -05:00
..
backend	YA attempt at taming worst-case behavior of get_actual_variable_range.	2022-11-22 14:40:44 -05:00
bin	Translation updates	2022-11-07 19:22:54 +01:00
common	Change some errdetail() to errdetail_internal()	2022-09-28 17:14:53 +02:00
fe_utils	Use correct connection for cancellation in frontend's parallel slots	2022-08-27 15:22:07 +09:00
include	Add comments and a missing CHECK_FOR_INTERRUPTS in ts_headline.	2022-11-21 17:07:07 -05:00
interfaces	Translation updates	2022-11-07 14:04:05 +01:00
makefiles	Refactor DLSUFFIX handling	2022-03-25 08:56:02 +01:00
pl	Translation updates	2022-11-07 14:04:05 +01:00
port	Re-allow building on Microsoft Visual Studio 2013.	2022-11-10 10:23:49 -05:00
template	On NetBSD, force dynamic symbol resolution at postmaster start.	2022-08-30 17:28:55 -04:00
test	Prevent port collisions between concurrent TAP tests	2022-11-22 10:51:13 -05:00
timezone	Update time zone data files to tzdata release 2022f.	2022-11-01 17:08:49 -04:00
tools	ci: Add hint about downloadable logs to README	2022-09-26 20:03:37 -07:00
tutorial	Doc: sync src/tutorial/basics.source with SGML documentation.	2022-11-19 13:09:14 -05:00
.gitignore
DEVELOPERS
Makefile	Remove the option to build thread_test.c outside configure.	2020-10-21 12:08:48 -04:00
Makefile.global.in	Prevent port collisions between concurrent TAP tests	2022-11-22 10:51:13 -05:00
Makefile.shlib	AIX: Fix missing libpq symbols by respecting SHLIB_EXPORTS.	2021-09-06 11:27:59 -07:00
nls-global.mk	Improve frontend error logging style.	2022-04-08 14:55:14 -04:00