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Previously an "amcanorderbyop" index would only be used when the index could provide sorted results which satisfied all query_pathkeys. Here we relax this so that we also allow these indexes to be considered by the planner when they only provide partially sorted results. This allows the planner to later consider making use of an Incremental Sort to satisfy the remaining pathkeys. This change is particularly useful for KNN-type queries which contain a LIMIT clause and an additional ORDER BY clause for a non-indexed column. Author: Miroslav Bendik Reviewed-by: Richard Guo, David Rowley Discussion: https://postgr.es/m/CAPoEpV0QYDtzjwamwWUBqyWpaCVbJV2d6qOD7Uy09bWn47PJtw%40mail.gmail.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. 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/.