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Tom Lane 628cbb50ba Re-implement extraction of fixed prefixes from regular expressions. ... To generate btree-indexable conditions from regex WHERE conditions (such as WHERE indexed_col ~ '^foo'), we need to be able to identify any fixed prefix that a regex might have; that is, find any string that must be a prefix of all strings satisfying the regex. We used to do that with entirely ad-hoc code that looked at the source text of the regex. It didn't know very much about regex syntax, which mostly meant that it would fail to identify some optimizable cases; but Viktor Rosenfeld reported that it would produce actively wrong answers for quantified parenthesized subexpressions, such as '^(foo)?bar'. Rather than trying to extend the ad-hoc code to cover this, let's get rid of it altogether in favor of identifying prefixes by examining the compiled form of a regex. To do this, I've added a new entry point "pg_regprefix" to the regex library; hopefully it is defined in a sufficiently general fashion that it can remain in the library when/if that code gets split out as a standalone project. Since this bug has been there for a very long time, this fix needs to get back-patched. However it depends on some other recent commits (particularly the addition of wchar-to-database-encoding conversion), so I'll commit this separately and then go to work on back-porting the necessary fixes.		13 years ago
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backend	Re-implement extraction of fixed prefixes from regular expressions.	13 years ago
bin	Run updated copyright.pl on HEAD and 9.2 trees, updating the psql	13 years ago
include	Re-implement extraction of fixed prefixes from regular expressions.	13 years ago
interfaces	Convert libpq regress script to Perl	13 years ago
makefiles	Remove BSD/OS (BSDi) port. There are no known users upgrading to	14 years ago
pl	Revert part of the previous patch that avoided using PLy_elog().	13 years ago
port	Don't try to trim "../" in join_path_components().	13 years ago
template	Remove BSD/OS (BSDi) port. There are no known users upgrading to	14 years ago
test	Re-implement extraction of fixed prefixes from regular expressions.	13 years ago
timezone	Run pgindent on 9.2 source tree in preparation for first 9.3	13 years ago
tools	Have copyright.pl skip updating something that is just the current year,	13 years ago
tutorial	Update copyright notices for year 2012.	14 years ago
.gitignore	Convert cvsignore to gitignore, and add .gitignore for build targets.	15 years ago
DEVELOPERS	…
Makefile	Fix some oversights in distprep and maintainer-clean targets.	15 years ago
Makefile.global.in	Make init-po and update-po recursive make targets	13 years ago
Makefile.shlib	Remove BSD/OS (BSDi) port. There are no known users upgrading to	14 years ago
bcc32.mak	Remove useless whitespace at end of lines	15 years ago
nls-global.mk	Lots of doc corrections.	14 years ago
win32.mak	Remove useless whitespace at end of lines	15 years ago