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David Rowley 87f81a5563 Fix hypothetical bug in ExprState building for hashing 
adf97c156 gave ExprStates the ability to hash expressions and return a
single hash value.  That commit supports seeding the hash value with an
initial value to have that blended into the final hash value.

Here we fix a hypothetical bug where if there are zero expressions to
hash, the initial value is stored in the wrong location.  The existing
code stored the initial value in an intermediate location expecting that
when the expressions were hashed that those steps would store the final
hash value in the ExprState.resvalue field.  However, that wouldn't happen
when there are zero expressions to hash.  The correct thing to do instead
is to have a special case for zero expressions and when we hit that case,
store the initial value directly in the ExprState.resvalue.  The reason
that this is a hypothetical bug is that no code currently calls
ExecBuildHash32Expr passing a non-zero initial value.

Discussion: https://postgr.es/m/CAApHDvpMAL_zxbMRr1LOex3O7Y7R7ZN2i8iUFLQhqQiJMAg3qw@mail.gmail.com
2024-11-06 09:16:00 +13:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Simplify checking for xlocale.h 2024-10-01 07:23:45 -04:00
contrib Update contrib/sepgsql regression tests for commit 89e51abcb. 2024-11-01 12:50:01 -04:00
doc Revert pg_wal_replay_wait() stored procedure 2024-11-04 22:47:57 +02:00
src Fix hypothetical bug in ExprState building for hashing 2024-11-06 09:16:00 +13:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml Make PG_TEST_EXTRA env var override the "meson setup" option 2024-11-04 14:09:25 +02:00
.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 commit 7f7474a8e4 to .git-blame-ignore-revs. 2024-10-14 15:09:39 -05:00
.gitattributes Remove non-existing file from .gitattributes 2024-02-16 11:39:09 +01:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.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 Add PG_TEST_EXTRA configure option to the Make builds 2024-11-04 14:09:38 +02:00
configure.ac Add PG_TEST_EXTRA configure option to the Make builds 2024-11-04 14:09:38 +02:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -05:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
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 Make PG_TEST_EXTRA env var override the "meson setup" option 2024-11-04 14:09:25 +02:00
meson_options.txt Make PG_TEST_EXTRA env var override the "meson setup" option 2024-11-04 14:09:25 +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/.