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Robert Haas 0e57b4d8bd Speed up text sorts where the same strings occur multiple times. 
Cache strxfrm() blobs across calls made to the text SortSupport
abbreviation routine.  This can speed up sorting if the same string
needs to be abbreviated many times in a row.

Also, cache the result of the previous strcoll() comparison, so that
if we're asked to compare the same strings agin, we do need to call
strcoll() again.

Perhaps surprisingly, these optimizations don't seem to hurt even when
they don't help.  memcmp() is really cheap compared to strcoll() or
strxfrm().

Peter Geoghegan, reviewed by me.
2015-10-09 19:03:44 -04:00
config Add BSWAP64 macro. 2015-10-08 13:01:36 -04:00
contrib Prevent stack overflow in query-type functions. 2015-10-05 10:06:30 -04:00
doc Fix typo in docs. 2015-10-08 13:21:16 -04:00
src Speed up text sorts where the same strings occur multiple times. 2015-10-09 19:03:44 -04:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Add functions for dealing with PGP armor header lines to pgcrypto. 2014-10-01 16:03:39 +03:00
.gitignore Add .gitignore entries for AIX-specific intermediate build artifacts. 2015-07-08 20:44:22 -04:00
aclocal.m4 Replace our hacked version of ax_pthread.m4 with latest upstream version. 2015-07-08 20:36:06 +03:00
configure Add BSWAP64 macro. 2015-10-08 13:01:36 -04:00
configure.in Add BSWAP64 macro. 2015-10-08 13:01:36 -04:00
COPYRIGHT Update copyright for 2015 2015-01-06 11:43:47 -05:00
GNUmakefile.in Fix distclean/maintainer-clean targets to remove top-level tmp_install dir. 2015-05-13 18:48:05 -04:00
HISTORY Improve text of stub HISTORY file. 2014-02-12 18:16:17 -05:00
Makefile Allow make check in PL directories 2011-02-15 06:52:12 +02:00
README Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00
README.git Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00

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.  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/.