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Overview
Comment:Set the WHERE_UNIQUE flag on loops that can only run once.
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SHA1: 510f4d8ecf6eb284f14b91951e7236505bd71203
User & Date: drh 2013-06-03 15:07:23
Context
2013-06-03
15:24
Virtual tables now always report 25 rows instead of 0 rows in the EXPLAIN QUERY PLAN output. Adjust tests accordingly. check-in: 7d91f688 user: drh tags: nextgen-query-plan-exp
15:07
Set the WHERE_UNIQUE flag on loops that can only run once. check-in: 510f4d8e user: drh tags: nextgen-query-plan-exp
14:15
Add test cases to verify that ticket [bc1aea7b725f2761] has been fixed in the NGQP. check-in: 9b97af94 user: drh tags: nextgen-query-plan-exp
Changes
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Changes to src/where.c.

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        /* "x IN (value, value, ...)" */
        nIn = pExpr->x.pList->nExpr;
      }
      pNew->u.btree.nEq++;
      pNew->nOut = (double)iRowEst * nInMul * nIn;
    }else if( pTerm->eOperator & (WO_EQ) ){
      pNew->wsFlags |= WHERE_COLUMN_EQ;






      pNew->u.btree.nEq++;
      pNew->nOut = (double)iRowEst * nInMul;
    }else if( pTerm->eOperator & (WO_ISNULL) ){
      pNew->wsFlags |= WHERE_COLUMN_NULL;
      pNew->u.btree.nEq++;
      pNew->nOut = (double)iRowEst * nInMul;
    }else if( pTerm->eOperator & (WO_GT|WO_GE) ){







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        /* "x IN (value, value, ...)" */
        nIn = pExpr->x.pList->nExpr;
      }
      pNew->u.btree.nEq++;
      pNew->nOut = (double)iRowEst * nInMul * nIn;
    }else if( pTerm->eOperator & (WO_EQ) ){
      pNew->wsFlags |= WHERE_COLUMN_EQ;
      if( iCol<0 
       || (pProbe->onError==OE_Abort && nInMul==1
           && pNew->u.btree.nEq==pProbe->nColumn-1)
      ){
        pNew->wsFlags |= WHERE_UNIQUE;
      }
      pNew->u.btree.nEq++;
      pNew->nOut = (double)iRowEst * nInMul;
    }else if( pTerm->eOperator & (WO_ISNULL) ){
      pNew->wsFlags |= WHERE_COLUMN_NULL;
      pNew->u.btree.nEq++;
      pNew->nOut = (double)iRowEst * nInMul;
    }else if( pTerm->eOperator & (WO_GT|WO_GE) ){