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It was possible when determining the cache keys for a Memoize path that if the same expr appeared twice in the parameterized path's ppi_clauses and/or in the Nested Loop's inner relation's lateral_vars. If this happened the Memoize node's cache keys would contain duplicates. This isn't a problem for correctness, all it means is that the cache lookups will be suboptimal due to having redundant work to do on every hash table lookup and insert. Here we adjust paraminfo_get_equal_hashops() to look for duplicates and ignore them when we find them. Author: David Rowley Reviewed-by: Richard Guo Discussion: https://postgr.es/m/422277.1706207562%40sss.pgh.pa.us |
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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/.