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Using this API, one backend can set up a ParallelHeapScanDesc to which multiple backends can then attach. Each tuple in the relation will be returned to exactly one of the scanning backends. Only forward scans are supported, and rescans must be carefully coordinated. This is not exposed to the planner or executor yet. The original version of this code was written by me. Amit Kapila reviewed it, tested it, and improved it, including adding support for synchronized scans, per review comments from Jeff Davis. Extensive testing of this and related patches was performed by Haribabu Kommi. Final cleanup of this patch by me.
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/.