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This is necessary when spgcanreturn() is invoked on a partitioned index, and the failure might be reachable in other scenarios as well. The rest of what spgGetCache() does is perfectly sensible for a partitioned index, so we should allow it to go through. I think the main takeaway from this is that we lack sufficient test coverage for non-btree partitioned indexes. Therefore, I added simple test cases for brin and gin as well as spgist (hash and gist AMs were covered already in indexing.sql). Per bug #18256 from Alexander Lakhin. Although the known test case only fails since v16 (3c569049b), I've got no faith at all that there aren't other ways to reach this problem; so back-patch to all supported branches. Discussion: https://postgr.es/m/18256-0b0e1b6e4a620f1b@postgresql.org
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/.