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Amit Langote 847ee701bd SQL/JSON: Some fixes to JsonBehavior expression casting 
1. Remove the special case handling when casting the JsonBehavior
   expressions to types with typmod, like 86d33987 did for the casting
   of SQL/JSON constructor functions.

2. Fix casting for fixed-length character and bit string types by
   using assignment-level casts.  This is again similar to what
   86d33987 did, but for ON ERROR / EMPTY expressions.

3. Use runtime coercion for the boolean ON ERROR constants so that
   using fixed-length character string types, for example, for an
   EXISTS column doesn't cause a "value too long for type
   character(n)" when the parser tries to coerce the default ON ERROR
   value "false" to that type, that is, even when clause is not
   specified.

4. Simplify the conditions of when to use runtime coercion vs
   creating the cast expression in the parser itself.  jsonb-valued
   expressions are now always coerced at runtime and boolean
   expressions too if the target type is a string type for the
   reasons mentioned above.

New tests are from a patch that Jian He posted.  Outputs of some
existing tests change because the coercion now happens at runtime
instead of at parse time.

Reported-by: Jian He <jian.universality@gmail.com>
Author: Jian He <jian.universality@gmail.com>
Author: Amit Langote <amitlangote09@gmail.com>
Discussion: https://postgr.es/m/CACJufxEo4sUjKCYtda0_qt9tazqqKPmF1cqhW9KBOUeJFqQd2g@mail.gmail.com
Backpatch-through: 17
2024-07-30 10:37:56 +09:00
config jit: Remove {llvm-config,clang}-N configure probes. 2024-05-16 13:58:25 +12:00
contrib postgres_fdw: Split out the query_cancel test to its own file 2024-07-22 12:49:57 +02:00
doc doc PG 17 relnotes: add "()" to PQsocketPoll mention 2024-07-28 04:10:11 -04:00
src SQL/JSON: Some fixes to JsonBehavior expression casting 2024-07-30 10:37:56 +09:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: Pin MacPorts version to 2.9.3. 2024-07-25 14:48:18 +12:00
.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 da256a4a7 to .git-blame-ignore-revs. 2024-05-14 16:37:22 -04:00
.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 Disable all TLS session tickets 2024-07-26 11:09:45 +02:00
configure.ac Disable all TLS session tickets 2024-07-26 11:09:45 +02:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -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 Adapt REL_17_STABLE to its new status as a stable branch 2024-07-01 08:05:35 +09:00
meson.build Support falling back to non-preferred readline implementation with meson 2024-07-27 13:54:16 +03:00
meson_options.txt Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
README.md Adapt REL_17_STABLE to its new status as a stable branch 2024-07-01 08:05:35 +09:00

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/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/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/.