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Base de données relationnelle
c1da1f45a1
reduce_outer_joins() mistakenly treated a semijoin like a left join for purposes of deciding whether not-null constraints created by the join's quals could be passed down into the join's left-hand side (possibly resulting in outer-join simplification there). Actually, semijoin works like inner join for this purpose, ie, we do not need to see any rows that can't possibly satisfy the quals. Hence, two-line fix to treat semi and inner joins alike. Per observation by Andres Freund about a performance gripe from Yazan Suleiman. Back-patch to 8.4, since this oversight has been there since the current handling of semijoins was implemented. |
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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: 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/.