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For parallel query, we need to be able to pass a Plan to a worker, so that it knows what it's supposed to do. We could invent our own way of serializing plans for that purpose, but piggybacking on the existing node infrastructure seems like a much better idea. Initially, we'll probably only support a limited number of nodes within parallel workers, but this commit adds support for everything in plannodes.h except CustomScan, because doing it all at once seems easier than doing it piecemeal, and it makes testing this code easier, too. CustomScan is excluded because making that work requires a larger rework of that facility. Amit Kapila, reviewed and slightly revised 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/.