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Bruce Momjian 109f079be6 I made the patch that improved the performance of replace_text().
The content of the patch is as follows:

(1)Create shortcut when subtext was not found.

(2)Stop using LEFT and RIGHT macro.
In LEFT and RIGHT macro, TEXTPOS is executed by the same content as
execution immediately before. The execution frequency of TEXTPOS can be
reduced by using text_substring instead of LEFT and RIGHT macro.

(3)Add appendStringInfoText, and use it instead of
appendStringInfoString.
There is an overhead of PG_TEXT_GET_STR when appendStringInfoString is
executed by text type. This can be reduced by appendStringInfoText.

(4)Reduce execution of TEXTDUP.

The effect of the patch that I measured is as follows:

- The Data for test was created by 'pgbench -i'.

- Test SQL:
 select replace(aid, '9', 'A') from accounts;

- Test results: Linux(CPU: Pentium III, Compiler option: -O2)
 original: 1.515s
 patched:  1.250s

Atsushi Ogawa
2005-07-04 18:56:44 +00:00
config Update to autoconf 2.59 as well as updates of related scripts 2005-07-01 18:17:31 +00:00
contrib Arrange for the postmaster (and standalone backends, initdb, etc) to 2005-07-04 04:51:52 +00:00
doc More TODO list section restructuring. 2005-07-04 17:43:42 +00:00
src I made the patch that improved the performance of replace_text(). 2005-07-04 18:56:44 +00:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Support cross compilation by compiling "zic" with a native compiler. This 2005-07-03 18:54:28 +00:00
configure.in Support cross compilation by compiling "zic" with a native compiler. This 2005-07-03 18:54:28 +00:00
COPYRIGHT Tag appropriate files for rc3 2004-12-31 22:04:05 +00:00
GNUmakefile.in Remove the contents of the src/corba subdirectory: this has been dead code 2005-05-01 06:15:51 +00:00
Makefile please find attached an alternate submission which addresses open item 2004-10-06 08:50:02 +00:00
README Remove more traces of libpgtcl from the source tree. Also, make some 2004-10-01 02:00:44 +00:00
README.CVS Some further editorializing on README.CVS. 2004-03-28 06:09:08 +00:00

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
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PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate
maintenance.  A Perl DBI/DBD driver is available from CPAN.

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
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