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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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11
src/backend/utils/adt/regexp.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/regexp.c,v 1.66 2006/10/04 00:29:59 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/regexp.c,v 1.67 2007/01/03 22:39:26 tgl Exp $
*
* Alistair Crooks added the code for the regex caching
* agc - cached the regular expressions used - there's a good chance
@ -624,3 +624,12 @@ similar_escape(PG_FUNCTION_ARGS)
PG_RETURN_TEXT_P(result);
}
/*
* report whether regex_flavor is currently BASIC
*/
bool
regex_flavor_is_basic(void)
{
return (regex_flavor == REG_BASIC);
}