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Alexander Korotkov 7e6fb5da41 Improvements and fixes for e0b1ee17dc 
e0b1ee17dc introduced optimization for matching B-tree scan keys required for
the directional scan.  However, it incorrectly assumed that all keys required
for opposite direction scan are satisfied by _bt_first().  It has been
illustrated that with multiple scan keys over the same column, a lesser one
(according to the scan direction) could win leaving the other one unsatisfied.

Instead of relying on _bt_first() this commit introduces code that memorizes
whether there was at least one match on the page.  If that's true we know that
keys required for opposite-direction scan are satisfied as soon as
corresponding values are not NULLs.

Also, this commit simplifies the description for the optimization of keys
required for the current direction scan.  Now the flag used for this is named
continuescanPrechecked and means exactly that *continuescan flag is known
to be true for the last item on the page.

Reported-by: Peter Geoghegan
Discussion: https://postgr.es/m/CAH2-Wzn0LeLcb1PdBnK0xisz8NpHkxRrMr3NWJ%2BKOK-WZ%2BQtTQ%40mail.gmail.com
Reviewed-by: Pavel Borisov
 		2023-12-27 14:35:08 +02:00
config Remove MSVC scripts 2023-12-20 09:44:37 +09:00
contrib pg_stat_statements: Add test coverage for pg_stat_statements_reset_1_7 2023-12-27 10:48:01 +01:00
doc doc: add ISO 8601 extended format example using to_char() 2023-12-26 15:31:50 -05:00
src Improvements and fixes for e0b1ee17dc 2023-12-27 14:35:08 +02:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml Use "template" data directory in tests 2023-08-24 14:38:02 -07:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add "Add trailing commas to enum definitions" to .git-blame-ignore-revs 2023-10-26 13:03:43 +02:00
.gitattributes Replace Gen_dummy_probes.sed with Gen_dummy_probes.pl 2023-11-14 10:27:10 +01:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
COPYRIGHT Update copyright for 2023 2023-01-02 15:00:37 -05:00
GNUmakefile.in Stop generating plain-text INSTALL instructions. 2023-12-22 13:32:15 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Stop generating plain-text INSTALL instructions. 2023-12-22 13:32:15 -05:00
README Stop generating plain-text INSTALL instructions. 2023-12-22 13:32:15 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Optimize pg_readv/pg_pwritev single vector case. 2023-11-29 17:19:25 +13:00
configure.ac Optimize pg_readv/pg_pwritev single vector case. 2023-11-29 17:19:25 +13:00
meson.build Initialize data directories with --lc-messages=C for tests. 2023-12-21 15:10:13 -08:00
meson_options.txt meson: Change default of 'selinux' feature option to auto 2023-11-17 10:23:02 -08:00

README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at:
https://www.postgresql.org/docs/devel/
In particular, information about building PostgreSQL from the source
code can be found at:
https://www.postgresql.org/docs/devel/installation.html

The latest version of this software, and related software, may be
obtained at https://www.postgresql.org/download/.  For more information
look at our web site located at https://www.postgresql.org/.