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David Rowley c7e5e994b2 Fix REALLOCATE_BITMAPSETS code 
7d58f2342 added a compile-time option to have bitmapset.c reallocate the
set before returning when a set is modified.  That commit failed to do
its job in various cases and returned the input set when it shouldn't
have in these cases.  Here we fix those missing cases.

This commit also adds some documentation about what
REALLOCATE_BITMAPSETS is for.  This is important as future functions
that go inside bitmapset.c need to know if they need to do anything
special when this compile-time option is defined.

Also, between 71a3e8c43 and 7d58f2342 some Asserts seem to have become
duplicated.  Tidy these up.  Rather than having the Assert check each
aspect of what makes a set invalid, here we introduce a helper function
which returns false when a set is invalid and have the Asserts use this
instead.

Also, make a pass on improving the comments in bitmapset.c.  Various
comments mentioned the input sets being "recycled".  This could be
interpreted to mean that the output set will always point to the same
memory as the given input parameter.  Here we try to make it clear that
this must not be relied upon and that callers must ensure that all
references to a given set are updated on each modification.

In passing, improve comments for bms_union(), bms_intersect() and
bms_difference() to detail what they do.  I (David) have too often had to
remind myself by reading the code each time to find out if I need, for
example, to use bms_union() or bms_join().  I also removed some
low-value comments that were trying to convey information about "these
operations" without mentioning which operations it was talking about.
It seems better to document these things in the function header comment
instead.

Author: Richard Guo, David Rowley
Discussion: https://postgr.es/m/CAMbWs4-djy9qYux2gZrtmxA0StrYXJjvB-oqLxn-d7J88t=PQQ@mail.gmail.com
2024-01-17 09:30:21 +13:00
config Add copyright notices to a few perl scripts that don't have them 2024-01-05 13:15:50 +00:00
contrib Make dblink interruptible, via new libpqsrv APIs. 2024-01-08 11:39:56 -08:00
doc Support identity columns in partitioned tables 2024-01-16 17:24:52 +01:00
src Fix REALLOCATE_BITMAPSETS code 2024-01-17 09:30:21 +13:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml Use "template" data directory in tests 2023-08-24 14:38:02 -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 previous commit to .git-blame-ignore-revs. 2024-01-13 13:56:46 -05:00
.gitattributes Replace Gen_dummy_probes.sed with Gen_dummy_probes.pl 2023-11-14 10:27:10 +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 Update copyright for 2024 2024-01-03 20:49:05 -05:00
configure.ac Update copyright for 2024 2024-01-03 20:49:05 -05:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -05:00
GNUmakefile.in Stop generating plain-text INSTALL instructions. 2023-12-22 13:32:15 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Stop generating plain-text INSTALL instructions. 2023-12-22 13:32:15 -05:00
meson.build Clarify which xml tools are missing in meson error message 2024-01-11 14:55:43 +01:00
meson_options.txt Update copyright for 2024 2024-01-03 20:49:05 -05:00
README Stop generating plain-text INSTALL instructions. 2023-12-22 13:32:15 -05:00

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.

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/.