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When creating a partitioned index, DefineIndex tries to identify any existing indexes on the partitions that match the partitioned index, so that it can absorb those as child indexes instead of building new ones. Part of the matching is to compare IndexInfo structs --- but that wasn't done quite right. We're comparing the IndexInfo built within DefineIndex itself to one made from existing catalog contents by BuildIndexInfo. Notably, while BuildIndexInfo will run index expressions and predicates through expression preprocessing, that has not happened to DefineIndex's struct. The result is failure to match and subsequent creation of duplicate indexes. The easiest and most bulletproof fix is to build a new IndexInfo using BuildIndexInfo, thereby guaranteeing that the processing done is identical. While here, let's also extract the opfamily and collation data from the new partitioned index, removing ad-hoc logic that duplicated knowledge about how those are constructed. Per report from Christophe Pettus. Back-patch to v11 where we invented partitioned indexes. Richard Guo and Tom Lane Discussion: https://postgr.es/m/8864BFAA-81FD-4BF9-8E06-7DEB8D4164ED@thebuild.com |
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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/.