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This isn't exposed to the optimizer or the executor yet; we'll add support for those things in a separate patch. But this puts the basic mechanism in place: several processes can attach to a parallel btree index scan, and each one will get a subset of the tuples that would have been produced by a non-parallel scan. Each index page becomes the responsibility of a single worker, which then returns all of the TIDs on that page. Rahila Syed, Amit Kapila, Robert Haas, reviewed and tested by Anastasia Lubennikova, Tushar Ahuja, and Haribabu Kommi.
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/.