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ExecMakeTableFunctionResult(), which is used in SELECT FROM function(...) cases, formerly treated a simple NULL output from a function that both returnsSet and returnsTuple as a violation of the SRF protocol. What seems better is to treat a NULL output as equivalent to ROW(NULL,NULL,...). Without this, cases such as SELECT FROM unnest(...) on an array of composite are vulnerable to unexpected and not-very-helpful failures. Old code comments here suggested an alternative of just ignoring simple-NULL outputs, but that doesn't seem very principled. This change had been hung up for a long time due to uncertainty about how much we wanted to buy into the equivalence of simple NULL and ROW(NULL,NULL,...). I think that's been mostly resolved by the discussion around bug #14235, so let's go ahead and do it. Per bug #7808 from Joe Van Dyk. Although this is a pretty old report, fixing it smells a bit more like a new feature than a bug fix, and the lack of other similar complaints suggests that we shouldn't take much risk of destabilization by back-patching. (Maybe that could be revisited once this patch has withstood some field usage.) Andrew Gierth and Tom Lane Report: <E1TurJE-0006Es-TK@wrigleys.postgresql.org> |
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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/.