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Peter Geoghegan f026fbf059 Make IndexScanInstrumentation a pointer in executor scan nodes. 
Change the IndexScanInstrumentation fields in IndexScanState,
IndexOnlyScanState, and BitmapIndexScanState from inline structs to
pointers.  This avoids additional space overhead whenever new fields are
added to IndexScanInstrumentation in the future, at least in the common
case where the instrumentation isn't used (i.e. when the executor node
isn't being run through an EXPLAIN ANALYZE).

Preparation for an upcoming patch series that will add index
prefetching.  The new slot-based interface that will enable index
prefetching necessitates that we add at least one more field to
IndexScanInstrumentation (to count heap fetches during index-only
scans).

Author: Peter Geoghegan <pg@bowt.ie>
Reviewed-By: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CAH2-Wz=g=JTSyDB4UtB5su2ZcvsS7VbP+ZMvvaG6ABoCb+s8Lw@mail.gmail.com
2026-03-22 13:20:29 -04:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Hardcode override of typeof_unqual for clang-for-bitcode 2026-03-16 19:24:49 +01:00
contrib plpgsql: optimize "SELECT simple-expression INTO var". 2026-03-20 18:23:45 -04:00
doc pg_verifybackup: Enable WAL parsing for tar-format backups 2026-03-20 15:31:35 -04:00
src Make IndexScanInstrumentation a pointer in executor scan nodes. 2026-03-22 13:20:29 -04:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml Revert "Change default value of default_toast_compression to "lz4"" 2026-03-05 08:25:35 +09:00
.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
.editorconfig Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.git-blame-ignore-revs Add commit 015d32016d to .git-blame-ignore-revs. 2026-03-19 13:45:07 +09:00
.gitattributes Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.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 Enable -Wstrict-prototypes and -Wold-style-definition by default 2026-03-18 14:31:50 +01:00
configure.ac Enable -Wstrict-prototypes and -Wold-style-definition by default 2026-03-18 14:31:50 +01:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -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 Restore AIX support. 2026-02-23 13:34:22 -05:00
meson.build Enable -Wstrict-prototypes and -Wold-style-definition by default 2026-03-18 14:31:50 +01:00
meson_options.txt Update copyright for 2026 2026-01-01 13:24:10 -05:00
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/.