213a1b8952
Many of the operations done for attribute stats in attribute_stats.c share the same logic as extended stats, as done by a patch under discussion to add support for extended stats import and export. All the pieces necessary for extended statistics are moved to stats_utils.c, which is the file where common facilities are shared for stats files. The following renames are done: * get_attr_stat_type() -> statatt_get_type() * init_empty_stats_tuple() -> statatt_init_empty_tuple() * set_stats_slot() -> statatt_set_slot() * get_elem_stat_type() -> statatt_get_elem_type() While on it, this commit adds more documentation for all these functions, describing more their internals and the dependencies that have been implied for attribute statistics. The same concepts apply to extended statistics, at some degree. Author: Corey Huinker <corey.huinker@gmail.com> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Reviewed-by: Yu Wang <wangyu_runtime@163.com> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/CADkLM=dpz3KFnqP-dgJ-zvRvtjsa8UZv8wDAQdqho=qN3kX0Zg@mail.gmail.com
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/.