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Tom Lane 1eccb93150 Re-allow using statistics for bool-valued functions in WHERE. 
Commit a391ff3c3, which added the ability for a function's support
function to provide a custom selectivity estimate for "WHERE f(...)",
unintentionally removed the possibility of applying expression
statistics after finding there's no applicable support function.
That happened because we no longer fell through to boolvarsel()
as before.  Refactor to do so again, putting the 0.3333333 default
back into boolvarsel() where it had been (cf. commit 39df0f150).

I surely wouldn't have made this error if 39df0f150 had included
a test case, so add one now.  At the time we did not have the
"extended statistics" infrastructure, but we do now, and it is
also unable to work in this scenario because of this error.
So make use of that for the test case.

This is very clearly a bug fix, but I'm afraid to put it into
released branches because of the likelihood of altering plan
choices, which we avoid doing in minor releases.  So, master only.

Reported-by: Frédéric Yhuel <frederic.yhuel@dalibo.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/a8b99dce-1bfb-4d97-af73-54a32b85c916@dalibo.com
2025-09-20 12:44:52 -04:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Remove traces of support for Sun Studio compiler 2025-09-12 07:39:05 +02:00
contrib Add optional pid parameter to pg_replication_origin_session_setup(). 2025-09-19 05:38:40 +00:00
doc Add optional pid parameter to pg_replication_origin_session_setup(). 2025-09-19 05:38:40 +00:00
src Re-allow using statistics for bool-valued functions in WHERE. 2025-09-20 12:44:52 -04:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml ci: Explicitly enable Meson features 2025-09-03 07:54:24 -07:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:54:03 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
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.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Remove traces of support for Sun Studio compiler 2025-09-12 07:39:05 +02:00
configure.ac Remove traces of support for Sun Studio compiler 2025-09-12 07:39:05 +02:00
COPYRIGHT Align organization wording in copyright statement 2025-05-16 11:20:07 -04:00
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HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Remove AIX support 2024-02-28 15:17:23 +04:00
meson.build Remove traces of support for Sun Studio compiler 2025-09-12 07:39:05 +02:00
meson_options.txt Add support for basic NUMA awareness 2025-04-07 23:08:17 +02:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

README.md

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/.