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Peter Geoghegan bee763aea1 nbtree: Always set skipScan flag on rescan. 
The TimescaleDB extension expects to be able to change an nbtree scan's
keys across rescans.  The issue arises in the extension's implementation
of loose index scan.  This is arguably a misuse of the index AM API,
though apparently it worked until recently.  It stopped working when the
skipScan flag was added to BTScanOpaqueData by commit 8a510275, though.
The flag wouldn't reliably track whether the scan (actually, the current
rescan) has any skip arrays, leading to confusion in _bt_set_startikey.

nbtree preprocessing will now defensively initialize the scan's skipScan
flag in all cases, including the case where _bt_preprocess_array_keys
returns early due to the (re)scan not using arrays.  While nbtree isn't
obligated to support this use case (at least not according to my reading
of the index AM API), it still seems like a good idea to be consistent
here, on general robustness grounds.

Author: Peter Geoghegan <pg@bowt.ie>
Reported-By: Natalya Aksman <natalya@timescale.com>
Discussion: https://postgr.es/m/CAJumhcirfMojbk20+W0YimbNDkwdECvJprQGQ-XqK--ph09nQw@mail.gmail.com
Backpatch-through: 18
2025-09-13 21:01:31 -04:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Don't put library-supplied -L/-I switches before user-supplied ones. 2025-07-29 15:17:40 -04:00
contrib Put "excludeOnly" GIN scan keys at the end of the scankey array. 2025-08-26 12:08:57 -04:00
doc Fix documentation for shmem_startup_hook. 2025-09-09 14:35:30 -05:00
src nbtree: Always set skipScan flag on rescan. 2025-09-13 21:01:31 -04:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:53 -04:00
.cirrus.tasks.yml ci: Simplify ci-os-only handling 2025-08-14 12:09:53 -04:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:33:44 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add script to keep .editorconfig in sync with .gitattributes 2025-02-01 10:09:45 +01:00
.git-blame-ignore-revs Add commit 17a5ca58eb to .git-blame-ignore-revs. 2025-09-13 14:58:49 -05:00
.gitattributes Fix git whitespace warning 2025-08-15 10:32:22 +02:00
.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 Stamp 18rc1. 2025-09-01 16:03:08 -04:00
configure.ac Stamp 18rc1. 2025-09-01 16:03:08 -04:00
COPYRIGHT Align organization wording in copyright statement 2025-05-16 11:20:07 -04:00
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 Adapt REL_18_STABLE to its new status as a stable branch 2025-06-29 23:00:00 -04:00
meson.build Stamp 18rc1. 2025-09-01 16:03:08 -04:00
meson_options.txt Add support for basic NUMA awareness 2025-04-07 23:08:17 +02:00
README.md Adapt REL_18_STABLE to its new status as a stable branch 2025-06-29 23:00:00 -04:00

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/18/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/18/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/.