postgresql/contrib/pageinspect
Tomas Vondra dae761a87e Add empty BRIN ranges during CREATE INDEX
When building BRIN indexes, the brinbuildCallback only advances to the
next page range when seeing a tuple that doesn't belong to the current
one. This means that the index may end up missing ranges at the end of
the table, if those pages do not contain any indexable tuples.

We tend not to have completely empty pages at the end of a relation, but
this also applies to partial indexes, where the tuples may simply not
match the index predicate. This results in inefficient scans using the
affected BRIN index - without the summaries, the page ranges have to be
read and processed, which consumes I/O and possibly also CPU time.

The existing code already added empty ranges for earlier parts of the
table, this commit makes sure we add them for the ranges at the end of
the table too.

Patch by Matthias van de Meent, with review/improvements by me.

Author: Matthias van de Meent
Reviewed-by: Tomas Vondra
Discussion: https://postgr.es/m/CAEze2WiMsPZg%3DxkvSF_jt4%3D69k6K7gz5B8V2wY3gCGZ%2B1BzCbQ%40mail.gmail.com
2023-12-08 17:14:32 +01:00
..
expected Add empty BRIN ranges during CREATE INDEX 2023-12-08 17:14:32 +01:00
sql Add empty BRIN ranges during CREATE INDEX 2023-12-08 17:14:32 +01:00
.gitignore pageinspect: Add tests 2016-11-01 14:02:16 -04:00
Makefile Add bt_multi_page_stats() function to contrib/pageinspect. 2023-01-02 13:02:29 -05:00
brinfuncs.c Show empty BRIN ranges in brin_page_items 2023-05-19 02:00:21 +02:00
btreefuncs.c Consolidate ItemPointer to Datum conversion functions 2023-02-13 09:57:15 +01:00
fsmfuncs.c Update copyright for 2023 2023-01-02 15:00:37 -05:00
ginfuncs.c Consolidate ItemPointer to Datum conversion functions 2023-02-13 09:57:15 +01:00
gistfuncs.c pageinspect: Fix gist_page_items() with included columns 2023-05-19 12:37:58 +09:00
hashfuncs.c Update copyright for 2023 2023-01-02 15:00:37 -05:00
heapfuncs.c Update copyright for 2023 2023-01-02 15:00:37 -05:00
meson.build Update copyright for 2023 2023-01-02 15:00:37 -05:00
pageinspect--1.0--1.1.sql Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:37 +02:00
pageinspect--1.1--1.2.sql Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:37 +02:00
pageinspect--1.2--1.3.sql pageinspect/BRIN: minor tweaks 2014-12-02 12:20:50 -03:00
pageinspect--1.3--1.4.sql Add forgotten file in commit d6061f83a1 2015-11-25 16:59:07 +03:00
pageinspect--1.4--1.5.sql Update pageinspect extension for parallel query. 2016-06-09 17:18:09 -04:00
pageinspect--1.5--1.6.sql pageinspect: Add bt_page_items function with bytea argument 2017-04-04 23:52:55 -04:00
pageinspect--1.5.sql Update pageinspect extension for parallel query. 2016-06-09 17:18:09 -04:00
pageinspect--1.6--1.7.sql Skip full index scan during cleanup of B-tree indexes when possible 2018-04-04 19:29:00 +03:00
pageinspect--1.7--1.8.sql pageinspect: Fix types used for bt_metap() columns. 2020-03-07 16:44:53 -08:00
pageinspect--1.8--1.9.sql Use full 64-bit XIDs in deleted nbtree pages. 2021-02-24 18:41:34 -08:00
pageinspect--1.9--1.10.sql pageinspect: Improve page_header() for pages of 32kB 2021-07-12 11:05:27 +09:00
pageinspect--1.10--1.11.sql Mark pageinspect's disk-accessing functions as parallel restricted. 2022-11-21 15:37:10 -05:00
pageinspect--1.11--1.12.sql Show empty BRIN ranges in brin_page_items 2023-05-19 02:00:21 +02:00
pageinspect.control Add bt_multi_page_stats() function to contrib/pageinspect. 2023-01-02 13:02:29 -05:00
pageinspect.h Update copyright for 2023 2023-01-02 15:00:37 -05:00
rawpage.c Update copyright for 2023 2023-01-02 15:00:37 -05:00