List of singleScanRowCount() Examples

Examples of singleScanRowCount()

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

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

        if (extraStartStopSelectivity != 1.0d)
        {
          costEstimate.setCost(
            costEstimate.getEstimatedCost(),
            costEstimate.rowCount() * extraStartStopSelectivity,
            costEstimate.singleScanRowCount() * extraStartStopSelectivity);


          optimizer.trace(Optimizer.COST_INCLUDING_EXTRA_START_STOP,
                  tableNumber, 0, 0.0, costEstimate);
        }
      }

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

       */
      if (ssKeySourceInList != null)
      {
        int listSize = ssKeySourceInList.getRightOperandList().size();
        double rc = costEstimate.rowCount() * listSize;
        double ssrc = costEstimate.singleScanRowCount() * listSize;


        /* If multiplication by listSize returns more rows than are
         * in the scan then just use the number of rows in the scan.
         */
        costEstimate.setCost(

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

      if (extraQualifierSelectivity != 1.0d)
      {
        costEstimate.setCost(
            costEstimate.getEstimatedCost(),
            costEstimate.rowCount() * extraQualifierSelectivity,
            costEstimate.singleScanRowCount() * extraQualifierSelectivity);


        optimizer.trace(Optimizer.COST_INCLUDING_EXTRA_QUALIFIER_SELECTIVITY,
                tableNumber, 0, 0.0, costEstimate);
      }

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


        optimizer.trace(Optimizer.COST_INCLUDING_EXTRA_QUALIFIER_SELECTIVITY,
                tableNumber, 0, 0.0, costEstimate);
      }


      singleScanRowCount = costEstimate.singleScanRowCount();


      /*
      ** Let the join strategy decide whether the cost of the base
      ** scan is a single scan, or a scan per outer row.
      ** NOTE: In this case we only want to multiply against the

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

      }


      costEstimate.setCost(
        newCost,
        rowCount,
        costEstimate.singleScanRowCount());




      optimizer.trace(Optimizer.COST_OF_N_SCANS, 
              tableNumber, 0, outerCost.rowCount(), costEstimate);

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

      // 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);
        optimizer.trace(Optimizer.COST_INCLUDING_EXTRA_NONQUALIFIER_SELECTIVITY,

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

                pushIndexName(cd, mb);
    mb.push(colRefItem);
    mb.push(getTrulyTheBestAccessPath().getLockMode());
    mb.push(tableLockGranularity);
    mb.push(getCompilerContext().getScanIsolationLevel());
    mb.push(costEstimate.singleScanRowCount());
    mb.push(costEstimate.getEstimatedCost());


    mb.callMethod(VMOpcode.INVOKEINTERFACE, (String) null, "getLastIndexKeyResultSet",
          ClassName.NoPutResultSet, 13);

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

    mb.push(cd.isConstraint());
    mb.push(colRefItem);
    mb.push(getTrulyTheBestAccessPath().getLockMode());
    mb.push(tableLockGranularity);
    mb.push(getCompilerContext().getScanIsolationLevel());
    mb.push(costEstimate.singleScanRowCount());
    mb.push(costEstimate.getEstimatedCost());
    
    mb.callMethod(VMOpcode.INVOKEINTERFACE, (String) null, "getDistinctScanResultSet",
              ClassName.NoPutResultSet, 16);
  }

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

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

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


    return finalCostEstimate;
  }


    String getOperatorName()

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