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Tom Lane a3d6264bbc interval_out() must be marked STABLE, not IMMUTABLE. 
Its results vary depending on the IntervalStyle GUC, so it cannot
be considered immutable.

This is an extremely ancient bug.  AFAICT it was a sloppy mistake
in 6f58115dd, which marked it "cacheable" alongside marking several
other interval functions that way.  At the time, interval_out()
depended on DateStyle not IntervalStyle, but it was still wrong.

Back-patching this change doesn't look very practical, so I won't.
Aside from the usual difficulties of getting catalog changes
applied to existing databases, people might have indexes,
generated columns, etc that depend on interval-to-text casts
being considered immutable.  (This'd not really give them any
problem as long as they never change IntervalStyle.)  They
wouldn't appreciate us breaking such usage in minor releases.

Per bug #17371 from Marcus Gartner.

Discussion: https://postgr.es/m/17371-8f57e6e9ca5e35bf@postgresql.org
 		2022-01-19 17:17:55 -05:00
config Make configure prefer python3 to plain python. 2022-01-19 15:38:58 -05:00
contrib Add Boolean node 2022-01-17 10:38:23 +01:00
doc Make configure prefer python3 to plain python. 2022-01-19 15:38:58 -05:00
src interval_out() must be marked STABLE, not IMMUTABLE. 2022-01-19 17:17:55 -05:00
.cirrus.yml ci: windows: run initdb with --no-sync. 2022-01-13 10:56:41 -08:00
.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 another old commit to git-blame-ignore-revs. 2021-11-03 17:34:19 -07:00
.gitattributes gitattributes: Add new entry to silence whitespace error 2021-06-05 07:57:31 +02:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
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HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
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README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Make configure prefer python3 to plain python. 2022-01-19 15:38:58 -05:00
configure.ac Make EXEC_BACKEND more convenient on Linux and FreeBSD. 2022-01-11 00:04:33 +13:00

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/.