34c9e455d0
ExecFindInitialMatchingSubPlans has to update the PartitionPruneState's subplan mapping data to account for the removal of subplans it prunes. However, that's only necessary if run-time pruning will also occur, so we can skip it when that won't happen, which should result in not needing to do the remapping in many cases. (We now need it only when some partitions are potentially startup-time prunable and others are potentially run-time prunable, which seems like an unusual case.) Also make some marginal performance improvements in the remapping itself. These will mainly win if most partitions got pruned by the startup-time pruning, which is perhaps a debatable assumption in this context. Also fix some bogus comments, and rearrange code to marginally reduce space consumption in the executor's query-lifespan context. David Rowley, reviewed by Yoshikazu Imai Discussion: https://postgr.es/m/CAKJS1f9+m6-di-zyy4B4AGn0y1B9F8UKDRigtBbNviXOkuyOpw@mail.gmail.com |
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| README.git | ||
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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/.