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Commit 45be99f8cd5d606086e0a458c9c72910ba8a613d removed GatherPath's num_workers field, but this is entirely bogus. Normally, a path's parallel_workers flag is supposed to indicate the number of workers that it wants, and should be 0 for a non-partial path. In that commit, I mistakenly thought that GatherPath could also use that field to indicate the number of workers that it would try to start, but that's disastrous, because then it can propagate up to higher nodes in the plan tree, which will then get incorrect rowcounts because the parallel_workers flag is involved in computing those values. Repair by putting the separate field back. Report by Tomas Vondra. Patch by me, reviewed by Amit Kapila. Discussion: http://postgr.es/m/f91b4a44-f739-04bd-c4b6-f135bd643669@2ndquadrant.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/.