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Tom Lane 921b993677 Fix RI_Initial_Check to use a COLLATE clause when needed in its query.
If the referencing and referenced columns have different collations,
the parser will be unable to resolve which collation to use unless it's
helped out in this way.  The effects are sometimes masked, if we end up
using a non-collation-sensitive plan; but if we do use a mergejoin
we'll see a failure, as recently noted by Robert Haas.

The SQL spec states that the referenced column's collation should be used
to resolve RI checks, so that's what we do.  Note however that we currently
don't append a COLLATE clause when writing a query that examines only the
referencing column.  If we ever support collations that have varying
notions of equality, that will have to be changed.  For the moment, though,
it's preferable to leave it off so that we can use a normal index on the
referencing column.
2011-04-11 21:32:53 -04:00
config Better support for thread-support flag detection with clang 2011-02-16 23:15:54 +02:00
contrib Clean up most -Wunused-but-set-variable warnings from gcc 4.6 2011-04-11 22:28:45 +03:00
doc Teach regular expression operators to honor collations. 2011-04-10 18:03:09 -04:00
src Fix RI_Initial_Check to use a COLLATE clause when needed in its query. 2011-04-11 21:32:53 -04:00
.gitignore Ignore files built by coverage builds 2011-03-08 22:10:00 +02:00
aclocal.m4
configure Support for DragonFly BSD 2011-03-02 21:15:28 +02:00
configure.in Support for DragonFly BSD 2011-03-02 21:15:28 +02:00
COPYRIGHT Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
GNUmakefile.in Add maintainer-check target 2011-03-28 22:56:52 +03:00
Makefile Allow make check in PL directories 2011-02-15 06:52:12 +02:00
README Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
README.git Trivial typo fix. 2010-09-21 14:16:00 -04:00

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/.