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Almost all functions provided by this extension are PARALLEL RESTRICTED. Mostly, that's because the leader's TCP connections won't be shared with the workers, but in some cases like dblink_get_pkey it's because they obtain locks which might be released early if taken within a parallel worker. dblink_fdw_validator probably can't be used in a query anyway, but there would be no problem from the point of view of parallel query if it were, so it's PARALLEL SAFE. Andreas Karlsson
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/.