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Previously, a prepared statement created via a Parse message could get a parallel plan, but one created with a PREPARE statement could not. This state of affairs was due to confusion on my (rhaas) part: I erroneously believed that a CREATE TABLE .. AS EXECUTE statement could only be performed with a prepared statement by PREPARE, but in fact one created by a Prepare message works just as well. Therefore, it makes no sense to allow parallel query in one case but not the other. To fix, allow parallel query with all prepared statements, but run the parallel plan serially (i.e. without workers) in the case of CREATE TABLE .. AS EXECUTE. Also, document this. Amit Kapila and Tobias Bussman, plus an extra sentence of documentation by me. |
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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. 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/.