475dbd0b71
For partitioned tables with large numbers of partitions where queries are able to prune all but a very small number of partitions, the time spent in the planner looping over RelOptInfo.part_rels checking for non-NULL RelOptInfos could become a large portion of the overall planning time. Here we add a Bitmapset that records the non-pruned partitions. This allows us to more efficiently skip the pruned partitions by looping over the Bitmapset. This will cause a very slight slow down in cases where no or not many partitions could be pruned, however, those cases are already slow to plan anyway and the overhead of looping over the Bitmapset would be unmeasurable when compared with the other tasks such as path creation for a large number of partitions. Reviewed-by: Amit Langote, Zhihong Yu Discussion: https://postgr.es/m/CAApHDvqnPx6JnUuPwaf5ao38zczrAb9mxt9gj4U1EKFfd4AqLA@mail.gmail.com |
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| GNUmakefile.in | ||
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README
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/.