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Michael Paquier e1405aa5e3 Add input function for data type pg_dependencies 
pg_dependencies is used as data type for the contents of dependencies
extended statistics.  This new input function consumes the format that
has been established by e76defbcf0 for the output function of
pg_dependencies, enforcing some sanity checks for:
- Checks for the input object, which should be a one-dimension array
with correct attributes and values.
- The key names: "attributes", "dependency", "degree".  All are
required, other key names are blocked.
- Value types for each key: "attributes" requires an array of integers,
"dependency" an attribute number, "degree" a float.
- List of attributes.  In this case, it is possible that some
dependencies are not listed in the statistics data, as items with a
degree of 0 are discarded when building the statistics.  This commit
includes checks for simple scenarios, like duplicated attributes, or
overlapping values between the list of "attributes" and the "dependency"
value.  Even if the input function considers the input as valid, a value
still needs to be cross-checked with the attributes defined in a
statistics object at import.
- Based on the discussion, the checks on the values are loose, as there
is also an argument for potentially stats injection.  For example,
"degree" should be defined in [0.0,1.0], but a check is not enforced.

This is required for a follow-up patch that aims to implement the import
of extended statistics.  Some tests are added to check the code paths of
the JSON parser checking the shape of the pg_dependencies inputs, with
91% of code coverage reached.  The tests are located in their own new
test file, for clarity.

Author: Corey Huinker <corey.huinker@gmail.com>
Reviewed-by: Jian He <jian.universality@gmail.com>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Yuefei Shi <shiyuefei1004@gmail.com>
Discussion: https://postgr.es/m/CADkLM=dpz3KFnqP-dgJ-zvRvtjsa8UZv8wDAQdqho=qN3kX0Zg@mail.gmail.com
2025-11-26 10:53:16 +09:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Remove traces of support for Sun Studio compiler 2025-09-12 07:39:05 +02:00
contrib Add slotsync skip statistics. 2025-11-25 07:06:02 +00:00
doc Add slotsync skip statistics. 2025-11-25 07:06:02 +00:00
src Add input function for data type pg_dependencies 2025-11-26 10:53:16 +09:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml ci: Improve OpenBSD core dump backtrace handling. 2025-11-06 21:14:05 +13:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:54:03 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.git-blame-ignore-revs Add commit f63ae72bbc to .git-blame-ignore-revs. 2025-11-18 10:32:22 -06:00
.gitattributes Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.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 Fix spurious output in configure 2025-11-06 08:00:57 +01:00
configure.ac Fix spurious output in configure 2025-11-06 08:00:57 +01:00
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 Remove AIX support 2024-02-28 15:17:23 +04:00
meson.build Add 'make check-tests' behavior to the meson based builds 2025-11-21 17:12:22 -05:00
meson_options.txt Add support for basic NUMA awareness 2025-04-07 23:08:17 +02:00
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/.