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David Rowley 930d2b442f Don't use bms_membership() in cases where we don't need to 
00b41463c adjusted Bitmapset so that an empty set is always represented
as NULL.  This makes checking for empty sets far cheaper than it used
to be.

There were various places in the code where we'd call bms_membership()
to handle the 3 possible BMS_Membership values.  For the BMS_SINGLETON
case, we'd also call bms_singleton_member() to find the single set member.
This can now be done in a more optimal way by first checking if the set is
NULL and then not bothering with bms_membership() and simply call
bms_get_singleton_member() instead to find the single member.  This
function will return false if there are multiple members in the set.

Here we also tidy up some logic in examine_variable() for the single
member case.  There's now no need to call bms_is_member() as we've
already established that we're working with a singleton Bitmapset, so we
can just check if varRelid matches the singleton member.

Reviewed-by: Richard Guo
Discussion: https://postgr.es/m/CAApHDvqW+CxNPcY245GaWiuqkkqgTudtG2ncGvvSjGn2wdTZLA@mail.gmail.com
2023-11-28 10:41:12 +13:00
config Remove distprep 2023-11-06 15:18:04 +01:00
contrib Track statement entry timestamp in contrib/pg_stat_statements 2023-11-27 02:52:17 +02:00
doc Fix CREATE INDEX CONCURRENTLY example 2023-11-27 19:18:03 +01:00
src Don't use bms_membership() in cases where we don't need to 2023-11-28 10:41:12 +13:00
.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
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Remove distprep 2023-11-06 15:18:04 +01:00
configure.ac Log OpenSSL version in ./configure output 2023-10-25 09:26:22 +09:00
COPYRIGHT Update copyright for 2023 2023-01-02 15:00:37 -05:00
GNUmakefile.in Remove distprep 2023-11-06 15:18:04 +01:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Dynamically find correct installation docs in Makefile. 2022-01-19 14:48:25 +01:00
meson.build meson: Document build targets, add 'help' target 2023-11-20 17:46:40 -08:00
meson_options.txt meson: Change default of 'selinux' feature option to auto 2023-11-17 10:23:02 -08:00
README README: remove duplicate download link & mention related softw. 2023-11-08 16:36:18 -05:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00

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.

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

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/.