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Tom Lane bfa691087e Fix memory leakage in plpgsql DO blocks that use cast expressions. 
Commit 04fe805a1 modified plpgsql so that datatype casts make use of
expressions cached by plancache.c, in place of older code where these
expression trees were managed by plpgsql itself.  However, I (tgl)
forgot that we use a separate, shorter-lived cast info hashtable in
DO blocks.  The new mechanism thus resulted in session-lifespan
leakage of the plancache data once a DO block containing one or more
casts terminated.  To fix, split the cast hash table into two parts,
one that tracks only the plancache's CachedExpressions and one that
tracks the expression state trees generated from them.  DO blocks need
their own expression state trees and hence their own version of the
second hash table, but there's no reason they can't share the
CachedExpressions with regular plpgsql functions.

Per report from Ajit Awekar.  Back-patch to v12 where the issue
was introduced.

Ajit Awekar and Tom Lane

Discussion: https://postgr.es/m/CAHv6PyrNaqdvyWUspzd3txYQguFTBSnhx+m6tS06TnM+KWc_LQ@mail.gmail.com
2023-04-24 14:19:46 -04:00
config Use --strip-unneeded when stripping static libraries with GNU strip. 2023-04-20 18:12:32 -04:00
contrib Validate ltree siglen GiST option to be int-aligned 2023-04-23 14:00:16 +03:00
doc Validate ltree siglen GiST option to be int-aligned 2023-04-23 14:00:16 +03:00
src Fix memory leakage in plpgsql DO blocks that use cast expressions. 2023-04-24 14:19:46 -04:00
.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 Backpatch addition of .git-blame-ignore-revs 2022-08-05 19:36:24 +02:00
.gitattributes gitattributes: Add new file 2019-11-12 08:13:55 +01:00
.gitignore Add portlock directory to .gitignore 2022-11-26 07:47:16 -05:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Use --strip-unneeded when stripping static libraries with GNU strip. 2023-04-20 18:12:32 -04:00
configure.in Fix handling of SCRAM-SHA-256's channel binding with RSA-PSS certificates 2023-02-15 10:12:36 +09:00
COPYRIGHT Update copyright for 2023 2023-01-02 15:00:36 -05:00
GNUmakefile.in Remove temporary portlock directory during make [dist]clean. 2022-11-26 10:30:58 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
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.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

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 may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.