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> User interface proposal for multi-row function targetlist entries > ================================================================= > 1. Only one targetlist entry may return a set. > 2. Each targetlist item (other than the set returning one) is > repeated for each item in the returned set. > Having gotten no objections (actually, no response at all), I can only assume no one had heartburn with this change. The attached patch covers the first of the two proposals, i.e. restricting the target list to only one set returning function. It compiles cleanly, and passes all regression tests. If there are no objections, please apply. Any suggestions on where this should be documented (other than maybe sql-select)? Thanks, Joe p.s. Here's what the previous example now looks like: CREATE TABLE bar(f1 int, f2 text, f3 int); INSERT INTO bar VALUES(1, 'Hello', 42); INSERT INTO bar VALUES(2, 'Happy', 45); CREATE TABLE foo(a int, b text); INSERT INTO foo VALUES(42, 'World'); INSERT INTO foo VALUES(42, 'Everyone'); INSERT INTO foo VALUES(45, 'Birthday'); INSERT INTO foo VALUES(45, 'New Year'); CREATE TABLE foo2(a int, b text); INSERT INTO foo2 VALUES(42, '!!!!'); INSERT INTO foo2 VALUES(42, '????'); INSERT INTO foo2 VALUES(42, '####'); INSERT INTO foo2 VALUES(45, '$$$$'); CREATE OR REPLACE FUNCTION getfoo(int) RETURNS SETOF text AS ' SELECT b FROM foo WHERE a = $1 ' language 'sql'; CREATE OR REPLACE FUNCTION getfoo2(int) RETURNS SETOF text AS ' SELECT b FROM foo2 WHERE a = $1 ' language 'sql'; regression=# SELECT f1, f2, getfoo(f3) AS f4 FROM bar; f1 | f2 | f4 ----+-------+---------- 1 | Hello | World 1 | Hello | Everyone 2 | Happy | Birthday 2 | Happy | New Year (4 rows) regression=# SELECT f1, f2, getfoo(f3) AS f4, getfoo2(f3) AS f5 FROM bar; ERROR: Only one target list entry may return a set result Joe Conway |
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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 several language bindings, including C, Perl, Python, and Tcl, as well as a JDBC driver. The ODBC and C++ interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. 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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.