mirror of
https://github.com/postgres/postgres.git
synced 2025-05-03 22:24:49 +03:00
f0461cd861
Traditionally check_partial_indexes() has only looked at restriction clauses while trying to prove partial indexes usable in queries. However, join clauses can also be used in some cases; mainly, that a strict operator on "x" proves an "x IS NOT NULL" index predicate, even if the operator is in a join clause rather than a restriction clause. Adding this code fixes a regression in 9.2, because previously we would take join clauses into account when considering whether a partial index could be used in a nestloop inner indexscan path. 9.2 doesn't handle nestloop inner indexscans in the same way, and this consideration was overlooked in the rewrite. Moving the work to check_partial_indexes() is a better solution anyway, since the proof applies whether or not we actually use the index in that particular way, and we don't have to do it over again for each possible outer relation. Per report from Dave Cramer.
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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.