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Tom Lane c66e4f138b Improve GiST range-contained-by searches by adding a flag for empty ranges. 
In the original implementation, a range-contained-by search had to scan
the entire index because an empty range could be lurking anywhere.
Improve that by adding a flag to upper GiST entries that says whether the
represented subtree contains any empty ranges.

Also, make a simple mod to the penalty function to discourage empty ranges
from getting pushed into subtrees without any.  This needs more work, and
the picksplit function should be taught about it too, but that code can be
improved without causing an on-disk compatibility break; so we'll leave it
for another day.

Since we're breaking on-disk compatibility of range values anyway, I took
the opportunity to reorganize the range flags bits; the unused
RANGE_xB_NULL bits are now adjacent, which might open the door for using
them in some other way later.

In passing, remove the GiST range opclass entry for <>, which doesn't seem
like it can really be indexed usefully.

Alexander Korotkov, with some editorializing by Tom
2011-11-27 16:51:29 -05:00
config Improve detection of Python 3.2 installations 2011-08-18 14:43:16 +03:00
contrib Add pg_upgrade test suite 2011-11-27 22:42:32 +02:00
doc Fix unsupported options in CREATE TABLE ... AS EXECUTE. 2011-11-24 23:21:45 -05:00
src Improve GiST range-contained-by searches by adding a flag for empty ranges. 2011-11-27 16:51:29 -05:00
.gitignore Add gitignore for mingw/cygwin build outputs 2011-06-09 18:11:47 +02:00
aclocal.m4 Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
configure Remove scandir() requirement in pg_upgrade; instead just use readdir() 2011-11-17 21:59:49 -05:00
configure.in Remove scandir() requirement in pg_upgrade; instead just use readdir() 2011-11-17 21:59:49 -05:00
COPYRIGHT Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
GNUmakefile.in Build src/ before contrib/ in make world 2011-08-24 21:34:49 +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

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/.