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The partial paths that get modified may already have been used as part of a GatherPath which appears in the path list, so modifying them is not a good idea at this stage - especially because this code has no check that the PathTarget is in fact parallel-safe. When partial aggregation is being performed, this is actually harmless because we'll end up replacing the pathtargets here with the correct ones within create_grouping_paths(). But if we've got a query tree containing only scan/join operations then this can result in incorrectly pushing down parallel-restricted target list entries. If those are, for example, references to subqueries, that can crash the server; but it's wrong in any event. Amit Kapila
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/.