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Fix regex, LIKE, and some other second-rank text-manipulation functions

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to not cause needless copying of text datums that have 1-byte headers.
Greg Stark, in response to performance gripe from Guillaume Smet and
ITAGAKI Takahiro.
This commit is contained in:
Tom Lane
2007-09-21 22:52:52 +00:00
parent cc59049daf
commit 7583f9a7ca
6 changed files with 212 additions and 192 deletions
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14
src/backend/utils/adt/like_match.c
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@@ -17,7 +17,7 @@
* Copyright (c) 1996-2007, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/like_match.c,v 1.16 2007/06/02 02:03:42 adunstan Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/like_match.c,v 1.17 2007/09/21 22:52:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -242,10 +242,10 @@ do_like_escape(text *pat, text *esc)
elen;
bool afterescape;
p = VARDATA(pat);
plen = (VARSIZE(pat) - VARHDRSZ);
e = VARDATA(esc);
elen = (VARSIZE(esc) - VARHDRSZ);
p = VARDATA_ANY(pat);
plen = VARSIZE_ANY_EXHDR(pat);
e = VARDATA_ANY(esc);
elen = VARSIZE_ANY_EXHDR(esc);
/*
* Worst-case pattern growth is 2x --- unlikely, but it's hardly worth
@@ -279,14 +279,14 @@ do_like_escape(text *pat, text *esc)
errmsg("invalid escape string"),
errhint("Escape string must be empty or one character.")));
e = VARDATA(esc);
e = VARDATA_ANY(esc);
/*
* If specified escape is '\', just copy the pattern as-is.
*/
if (*e == '\\')
{
memcpy(result, pat, VARSIZE(pat));
memcpy(result, pat, VARSIZE_ANY(pat));
return result;
}