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Disable the OR-clause optimization if it does not result in an index being

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used that would not have been used otherwise.  In other words, do not
convert OR clauses into an IN statement if it does not help the optimizer. (CVS 2789)

FossilOrigin-Name: 7e7cfce0f8ed2a6e04747736a2c68484f447cdfb
This commit is contained in:
drh
2005-11-26 14:24:40 +00:00
parent 54a167d1fe
commit 9a5f7474e3
3 changed files with 14 additions and 12 deletions
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12
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 1.184 2005/11/26 14:08:08 drh Exp $
** $Id: where.c,v 1.185 2005/11/26 14:24:41 drh Exp $
*/
#include "sqliteInt.h"
@@ -700,15 +700,17 @@ static void exprAnalyze(
}
pNew = sqlite3Expr(TK_IN, pDup, 0, 0);
if( pNew ){
int idxNew;
transferJoinMarkings(pNew, pExpr);
pNew->pList = pList;
idxNew = whereClauseInsert(pWC, pNew, TERM_VIRTUAL|TERM_DYNAMIC);
exprAnalyze(pSrc, pMaskSet, pWC, idxNew);
pTerm = &pWC->a[idxTerm];
pWC->a[idxNew].iParent = idxTerm;
pTerm->nChild = 1;
}else{
sqlite3ExprListDelete(pList);
}
pTerm->pExpr = pNew;
pTerm->flags |= TERM_DYNAMIC;
exprAnalyze(pSrc, pMaskSet, pWC, idxTerm);
pTerm = &pWC->a[idxTerm];
}
or_not_possible:
whereClauseClear(&sOr);