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Save the range table indexes of result relations and row mark relations in separate bitmapsets in the PlannedStmt. Precomputing them allows cheap membership checks during execution. Together, these two groups approximate all relations that will be modified by a query. This includes relations targeted by INSERT, UPDATE, DELETE, and MERGE as well as relations with any row mark (like SELECT FOR UPDATE). Future work will use information on whether or not a relation is modified by a query in a heuristic. PlannedStmt->resultRelations is only used in a membership check, so it will be removed in a separate commit. Author: Melanie Plageman <melanieplageman@gmail.com> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: David Rowley <dgrowleyml@gmail.com> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://postgr.es/m/F5CDD1B5-628C-44A1-9F85-3958C626F6A9%40gmail.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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.