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Tom Lane 080b7db72e Fix "cannot accept a set" error when only some arms of a CASE return a set. 
In commit c1352052ef, I implemented an
optimization that assumed that a function's argument expressions would
either always return a set (ie multiple rows), or always not.  This is
wrong however: we allow CASE expressions in which some arms return a set
of some type and others just return a scalar of that type.  There may be
other examples as well.  To fix, replace the run-time test of whether an
argument returned a set with a static precheck (expression_returns_set).
This adds a little bit of query startup overhead, but it seems barely
measurable.

Per bug #8228 from David Johnston.  This has been broken since 8.0,
so patch all supported branches.
2014-01-08 20:18:58 -05:00
config Remove maintainer-check target, fold into normal build 2013-10-10 20:11:56 -04:00
contrib pg_upgrade: Fix fatal error handling 2014-01-08 07:01:16 -05:00
doc Update copyright for 2014 2014-01-07 16:05:30 -05:00
src Fix "cannot accept a set" error when only some arms of a CASE return a set. 2014-01-08 20:18:58 -05:00
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.gitattributes gitattributes: Make syntax compatible with older Git versions 2013-11-12 21:58:46 -05:00
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configure Update copyright for 2014 2014-01-07 16:05:30 -05:00
configure.in Update copyright for 2014 2014-01-07 16:05:30 -05:00
COPYRIGHT Update copyright for 2014 2014-01-07 16:05:30 -05:00
GNUmakefile.in Remove maintainer-check target, fold into normal build 2013-10-10 20:11:56 -04:00
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README
README.git Fix doc links in README file to work with new website layout 2013-11-12 12:53:32 +01:00

README 

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.  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
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.