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Create an array estate->es_relations[] paralleling the es_range_table, and store references to Relations (relcache entries) there, so that any given RT entry is opened and closed just once per executor run. Scan nodes typically still call ExecOpenScanRelation, but ExecCloseScanRelation is no more; relation closing is now done centrally in ExecEndPlan. This is slightly more complex than one would expect because of the interactions with relcache references held in ResultRelInfo nodes. The general convention is now that ResultRelInfo->ri_RelationDesc does not represent a separate relcache reference and so does not need to be explicitly closed; but there is an exception for ResultRelInfos in the es_trig_target_relations list, which are manufactured by ExecGetTriggerResultRel and have to be cleaned up by ExecCleanUpTriggerState. (That much was true all along, but these ResultRelInfos are now more different from others than they used to be.) To allow the partition pruning logic to make use of es_relations[] rather than having its own relcache references, adjust PartitionedRelPruneInfo to store an RT index rather than a relation OID. Amit Langote, reviewed by David Rowley and Jesper Pedersen, some mods by me Discussion: https://postgr.es/m/468c85d9-540e-66a2-1dde-fec2b741e688@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/.