mirror of
https://github.com/postgres/postgres.git
synced 2025-05-08 07:21:33 +03:00
5674a258fd
Commit 7aea8e4f2daa4b39ca9d1309a0c4aadb0f7ed81b allowed a parallel plan to be generated when for a RETURN QUERY or RETURN QUERY EXECUTE statement in a PL/pgsql block, but that's a bad idea because plplgsql asks the executor for 50 rows at a time. That means that we'll always be running serially a plan that was intended for parallel execution, which is not a good idea. Fix by not requesting a parallel plan from the outset. Per discussion, back-patch to 9.6. There is a slight risk that, due to optimizer error, somebody could have a case where the parallel plan executed serially is actually faster than the supposedly-best serial plan, but the consensus seems to be that that's not sufficient justification for leaving 9.6 unpatched. Discussion: http://postgr.es/m/CA+TgmoZ_ZuH+auEeeWnmtorPsgc_SmP+XWbDsJ+cWvWBSjNwDQ@mail.gmail.com Discussion: http://postgr.es/m/CA+TgmobXEhvHbJtWDuPZM9bVSLiTj-kShxQJ2uM5GPDze9fRYA@mail.gmail.com
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. 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/.