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The LIKE optimization does the right thing when collating sequences are

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present.  LIKE expressions where the left-hand side has COLLATE NOCASE
are optimized in the default case. (CVS 2637)

FossilOrigin-Name: ef84ff795c85e9d28f1cac84ff42d8d4ef84cfc4
This commit is contained in:
drh
2005-08-28 17:00:23 +00:00
parent bfd6b03554
commit d64fe2f374
9 changed files with 126 additions and 34 deletions
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15
src/where.c
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@@ -16,7 +16,7 @@
** so is applicable. Because this module is responsible for selecting
** indices, you might also think of this module as the "query optimizer".
**
** $Id: where.c,v 1.165 2005/08/24 03:52:19 drh Exp $
** $Id: where.c,v 1.166 2005/08/28 17:00:25 drh Exp $
*/
#include "sqliteInt.h"
@@ -479,8 +479,11 @@ static int isLikeOrGlob(
Expr *pRight, *pLeft;
ExprList *pList;
int c, cnt;
int noCase;
char wc[3];
if( !sqlite3IsLikeFunction(db, pExpr, wc) ){
CollSeq *pColl;
if( !sqlite3IsLikeFunction(db, pExpr, &noCase, wc) ){
return 0;
}
pList = pExpr->pList;
@@ -492,6 +495,14 @@ static int isLikeOrGlob(
if( pLeft->op!=TK_COLUMN ){
return 0;
}
pColl = pLeft->pColl;
if( pColl==0 ){
pColl = db->pDfltColl;
}
if( (pColl->type!=SQLITE_COLL_BINARY || noCase) &&
(pColl->type!=SQLITE_COLL_NOCASE || !noCase) ){
return 0;
}
sqlite3DequoteExpr(pRight);
z = pRight->token.z;
for(cnt=0; (c=z[cnt])!=0 && c!=wc[0] && c!=wc[1] && c!=wc[2]; cnt++){}