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Tom Lane 25549edb26 Fix equivclass.c's not-quite-right strategy for handling X=X clauses. 
The original coding correctly noted that these aren't just redundancies
(they're effectively X IS NOT NULL, assuming = is strict).  However, they
got treated that way if X happened to be in a single-member EquivalenceClass
already, which could happen if there was an ORDER BY X clause, for instance.
The simplest and most reliable solution seems to be to not try to process
such clauses through the EquivalenceClass machinery; just throw them back
for traditional processing.  The amount of work that'd be needed to be
smarter than that seems out of proportion to the benefit.

Per bug #5084 from Bernt Marius Johnsen, and analysis by Andrew Gierth.
2009-09-29 01:20:34 +00:00
config Remove any -arch switches given in ExtUtils::Embed's ldopts from our 2009-09-08 18:15:55 +00:00
contrib plug dblink resource leak 2009-09-12 23:20:52 +00:00
doc Extend the BKI infrastructure to allow system catalogs to be given 2009-09-26 22:42:03 +00:00
src Fix equivclass.c's not-quite-right strategy for handling X=X clauses. 2009-09-29 01:20:34 +00:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Write psql's ~/.psql_history file using history_truncate_file() and 2009-09-13 22:18:22 +00:00
configure.in Write psql's ~/.psql_history file using history_truncate_file() and 2009-09-13 22:18:22 +00:00
COPYRIGHT Update copyright for 2009. 2009-01-01 17:24:05 +00:00
GNUmakefile.in Be able to easily figure out the target directory of "make dist". 2009-08-14 21:37:18 +00:00
Makefile Remove remains of old depend target. 2007-01-20 17:16:17 +00:00
README Point to our download URL, rather than listing interface in the README 2008-05-06 22:02:12 +00:00
README.CVS Fix the makefiles to fail cleanly if Perl is needed but not present. This 2009-06-23 03:46:00 +00:00

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/.