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When querying a partitioned table containing a default partition, we were wrongly deciding to include it in the scan too early in the process, failing to exclude it in some cases. If we reinterpret the PruneStepResult.scan_default flag slightly, we can do a better job at detecting that it can be excluded. The change is that we avoid setting the flag for that pruning step unless the step absolutely requires the default partition to be scanned (in contrast with the previous arrangement, which was to set it unless the step was able to prune it). So get_matching_partitions() must explicitly check the partition that each returned bound value corresponds to in order to determine whether the default one needs to be included, rather than relying on the flag from the final step result. Author: Yuzuko Hosoya <hosoya.yuzuko@lab.ntt.co.jp> Reviewed-by: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp> Discussion: https://postgr.es/m/00e601d4ca86$932b8bc0$b982a340$@lab.ntt.co.jp |
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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/.