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Add pg_statistic_ext_data.stxdinherit flag, so that for each extended statistics definition we can store two versions of data - one for the relation alone, one for the whole inheritance tree. This is analogous to pg_statistic.stainherit, but we failed to include such flag in catalogs for extended statistics, and we had to work around it (see commits 859b3003de, 36c4bc6e72 and 20b9fa308e). This changes the relationship between the two catalogs storing extended statistics objects (pg_statistic_ext and pg_statistic_ext_data). Until now, there was a simple 1:1 mapping - for each definition there was one pg_statistic_ext_data row, and this row was inserted while creating the statistics (and then updated during ANALYZE). With the stxdinherit flag, we don't know how many rows there will be (child relations may be added after the statistics object is defined), so there may be up to two rows. We could make CREATE STATISTICS to always create both rows, but that seems wasteful - without partitioning we only need stxdinherit=false rows, and declaratively partitioned tables need only stxdinherit=true. So we no longer initialize pg_statistic_ext_data in CREATE STATISTICS, and instead make that a responsibility of ANALYZE. Which is what we do for regular statistics too. Patch by me, with extensive improvements and fixes by Justin Pryzby. Author: Tomas Vondra, Justin Pryzby Reviewed-by: Tomas Vondra, Justin Pryzby Discussion: https://postgr.es/m/20210923212624.GI831%40telsasoft.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. 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/.