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Because index creation does not go through heap_create_with_catalog() we didn't call pgstat_create_relation(), leading to index stats of a newly created realtion not getting dropped during rollback. To fix, move the pgstat_create_relation() to heap_create(), which indexes do use. Similarly, because dropping an index does not go through heap_drop_with_catalog(), we didn't drop index stats when the transaction dropping an index committed. Here there's no convenient common path for indexes and relations, so index_drop() now calls pgstat_drop_relation(). Add tests for transactional index stats handling. Author: "Drouvot, Bertrand" <bdrouvot@amazon.com> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Discussion: https://postgr.es/m/51bbf286-2b4a-8998-bd12-eaae4b765d99@amazon.com Backpatch: 15-, like 8b1dccd37c71, which introduced the bug
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/.