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Thomas Munro 158f581923 Fix if/while thinko in read_stream.c edge case. 
When we determine that a wanted block can't be combined with the current
pending read, it's time to start that read to get it out of the way.  An
"if" in that code path should have been a "while", because it might take
more than one go in case of partial reads.  This was only broken for
smaller ranges, as the more common case of io_combine_limit-sized ranges
is handled earlier in the code and knows how to loop, hiding the bug for
a while.

Discovered while testing large parallel sequential scans of partially
cached tables.  The ramp-up-and-down block allocator for parallel scans
could hit the problem case and skip some blocks near the end that should
have been streamed.

Defect in commit b5a9b18c.

Discussion: https://postgr.es/m/CA%2BhUKG%2Bh8Whpv0YsJqjMVkjYX%2B80fTVc6oi-V%2BzxJvykLpLHYQ%40mail.gmail.com
2024-04-07 14:51:33 +12:00
config Remove AIX support 2024-02-28 15:17:23 +04:00
contrib Make libpqsrv_cancel's return const char *, not char * 2024-04-05 18:23:10 +02:00
doc Support retrieval of results in chunks with libpq. 2024-04-06 20:45:11 -04:00
src Fix if/while thinko in read_stream.c edge case. 2024-04-07 14:51:33 +12:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: macos: Choose python version 2024-03-25 16:39:08 -07:00
.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 64e401b62b to .git-blame-ignore-revs. 2024-03-26 15:08:47 -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
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Add --copy-file-range option to pg_upgrade. 2024-03-06 12:01:01 +13:00
configure.ac Add --copy-file-range option to pg_upgrade. 2024-03-06 12:01:01 +13:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -05:00
GNUmakefile.in make dist uses git archive 2024-03-25 06:29:53 +01:00
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 Silence meson warning 2024-04-04 11:22:07 +02:00
meson_options.txt Add backend support for injection points 2024-01-22 10:15:50 +09:00
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/.