@Override
public double getRows() {
// REVIEW jvs 30-May-2005: I just pulled this out of a hat.
double dRows = RelMetadataQuery.getRowCount(inputs.get(0));
for (int i = 1; i < inputs.size(); i++) {
dRows -= 0.5 * RelMetadataQuery.getRowCount(inputs.get(i));
}
if (dRows < 0) {
dRows = 0;
}
return dRows;
}
@Override
public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq) {
// We always "build" the
double rowCount = mq.getRowCount(this);
return planner.getCostFactory().makeCost(rowCount, 0, 0);
}
@Override
public RelOptCost computeSelfCost(RelOptPlanner planner) {
if (PrelUtil.getSettings(getCluster()).useDefaultCosting()) {
// We use multiplier 0.05 for TopN operator, and 0.1 for Sort, to make TopN a preferred
// choice.
return super.computeSelfCost(planner).multiplyBy(.1);
}
RelNode child = this.getInput();
double inputRows = RelMetadataQuery.getRowCount(child);
// int rowWidth = child.getRowType().getPrecision();
int numSortFields = this.collation.getFieldCollations().size();
double cpuCost =
DrillCostBase.COMPARE_CPU_COST
* numSortFields
* inputRows
* (Math.log(inputRows) / Math.log(2));
double diskIOCost =
0; // assume in-memory for now until we enforce operator-level memory constraints
// TODO: use rowWidth instead of avgFieldWidth * numFields
// avgFieldWidth * numFields * inputRows
double numFields = this.getRowType().getFieldCount();
long fieldWidth =
PrelUtil.getPlannerSettings(planner)
.getOptions()
.getOption(ExecConstants.AVERAGE_FIELD_WIDTH_KEY)
.num_val;
double memCost = fieldWidth * numFields * inputRows;
DrillCostFactory costFactory = (DrillCostFactory) planner.getCostFactory();
return costFactory.makeCost(inputRows, cpuCost, diskIOCost, 0, memCost);
}
public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq) {
double dRows = mq.getRowCount(this);
double dCpu = mq.getRowCount(getInput()) * program.getExprCount();
double dIo = 0;
return planner.getCostFactory().makeCost(dRows, dCpu, dIo);
}
