Examples of org.apache.derby.iapi.sql.compile.CostEstimate.rowCount()

Package org.apache.derby.iapi.sql.compile

Class org.apache.derby.iapi.sql.compile.CostEstimate

Examples of org.apache.derby.iapi.sql.compile.CostEstimate.rowCount()

org.apache.derby.iapi.sql.compile.CostEstimate.rowCount()
Get the estimated number of rows returned by the ResultSet that this CostEstimate models.

      // don't factor in extraNonQualifierSelectivity in case of oneRowResultSetForSomeConglom
      // because "1" is the final result and the effect of other predicates already considered
      // beetle 4787
      else if (extraNonQualifierSelectivity != 1.0d)
      {
        rc = oneRowResultSetForSomeConglom ? costEstimate.rowCount() :
                      costEstimate.rowCount() * extraNonQualifierSelectivity;
        src = costEstimate.singleScanRowCount() * extraNonQualifierSelectivity;
      }
      if (rc != -1) // changed
      {

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      // because "1" is the final result and the effect of other predicates already considered
      // beetle 4787
      else if (extraNonQualifierSelectivity != 1.0d)
      {
        rc = oneRowResultSetForSomeConglom ? costEstimate.rowCount() :
                      costEstimate.rowCount() * extraNonQualifierSelectivity;
        src = costEstimate.singleScanRowCount() * extraNonQualifierSelectivity;
      }
      if (rc != -1) // changed
      {
        costEstimate.setCost(costEstimate.getEstimatedCost(), rc, src);

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                  optimizer,
                  rowOrdering);


    costEstimate = getCostEstimate(optimizer);
    costEstimate.setCost(childCost.getEstimatedCost(),
               childCost.rowCount(),
               childCost.singleScanRowCount());




    /*
    ** No need to use estimateCost on join strategy - that has already

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    }


    mb.push(subqResultSetNumber);
    mb.push(subqueryNumber);
    mb.push(pointOfAttachment);
    mb.push(costEstimate.rowCount());
    mb.push(costEstimate.getEstimatedCost());


    mb.callMethod(VMOpcode.INVOKEINTERFACE, (String) null, resultSetString, ClassName.NoPutResultSet, nargs);

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                              outerCost,
                              rowOrdering);
      /* Copy child cost to this node's cost */
      costEstimate.setCost(
              childCost.getEstimatedCost(),
              childCost.rowCount(),
              childCost.singleScanRowCount());




      // Note: we don't call "optimizer.considerCost()" here because
      // a) the child will make that call as part of its own

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      /* Copy child cost to this node's cost */
      childCost = childResult.costEstimate;


      costEstimate.setCost(
              childCost.getEstimatedCost(),
              childCost.rowCount(),
              childCost.singleScanRowCount());


      /* Note: Prior to the fix for DERBY-781 we had calls here
       * to set the cost estimate for BestAccessPath and
       * BestSortAvoidancePath to equal costEstimate.  That used

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    CostEstimate rightCE = rightResultSet.getFinalCostEstimate();


    finalCostEstimate = getNewCostEstimate();
    finalCostEstimate.setCost(
      leftCE.getEstimatedCost() + rightCE.getEstimatedCost(),
      rightCE.rowCount(),
      rightCE.rowCount());


    return finalCostEstimate;
  }

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    finalCostEstimate = getNewCostEstimate();
    finalCostEstimate.setCost(
      leftCE.getEstimatedCost() + rightCE.getEstimatedCost(),
      rightCE.rowCount(),
      rightCE.rowCount());


    return finalCostEstimate;
  }


  protected void oneRowRightSide(ActivationClassBuilder acb,

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        CostEstimate leftCostEstimate = leftResultSet.getCostEstimate();
        CostEstimate rightCostEstimate = rightResultSet.getCostEstimate();
        // The cost is the sum of the two child costs plus the cost of sorting the union.
        costEstimate.setCost( leftCostEstimate.getEstimatedCost() + rightCostEstimate.getEstimatedCost(),
                              getRowCountEstimate( leftCostEstimate.rowCount(),
                                                   rightCostEstimate.rowCount()),
                              getSingleScanRowCountEstimate( leftCostEstimate.singleScanRowCount(),
                                                             rightCostEstimate.singleScanRowCount()));


        return costEstimate;
    } // End of estimateCost

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    CostEstimate rightCE = rightResultSet.getFinalCostEstimate();


    finalCostEstimate = getNewCostEstimate();
    finalCostEstimate.setCost(
      leftCE.getEstimatedCost() + rightCE.getEstimatedCost(),
      getRowCountEstimate(leftCE.rowCount(), rightCE.rowCount()),
      getSingleScanRowCountEstimate(leftCE.singleScanRowCount(),
        rightCE.singleScanRowCount()));


    return finalCostEstimate;
  }

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