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Fix regex_fixed_prefix() to cope reasonably well with regex patterns of the

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form '^(foo)$'.  Before, these could never be optimized into indexscans.
The recent changes to make psql and pg_dump generate such patterns (for \d
commands and -t and related switches, respectively) therefore represented
a big performance hit for people with large pg_class catalogs, as seen in
recent gripe from Erik Jones.  While at it, be more paranoid about
case-sensitivity checking in multibyte encodings, and fix some other
corner cases in which a regex might be interpreted too liberally.
This commit is contained in:
Tom Lane
2007-01-03 22:39:26 +00:00
parent 9c88830ec4
commit d6061d2f31
3 changed files with 112 additions and 53 deletions
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3
src/include/utils/builtins.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.283 2006/12/30 21:21:55 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.284 2007/01/03 22:39:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -477,6 +477,7 @@ extern Datum textregexsubstr(PG_FUNCTION_ARGS);
extern Datum textregexreplace_noopt(PG_FUNCTION_ARGS);
extern Datum textregexreplace(PG_FUNCTION_ARGS);
extern Datum similar_escape(PG_FUNCTION_ARGS);
extern bool regex_flavor_is_basic(void);
/* regproc.c */
extern Datum regprocin(PG_FUNCTION_ARGS);