// implement RelNode
public RelOptCost computeSelfCost(RelOptPlanner planner) {
double dRows = RelMetadataQuery.getRowCount(this);
// Assume CPU is negligible since values are precomputed.
double dCpu = 1;
double dIo = 0;
return planner.makeCost(dRows, dCpu, dIo);
}
public RelTraitSet traitSetOf(RelTrait... traits) {
RelTraitSet traitSet = emptyTraitSet;
assert traitSet.size() == planner.getRelTraitDefs().size();
for (RelTrait trait : traits) {
traitSet = traitSet.replace(trait);
}
return traitSet;
}
@Override
public RelOptCost computeSelfCost(RelOptPlanner planner) {
// Higher cost if rows are wider discourages pushing a project through a
// sort.
double rowCount = RelMetadataQuery.getRowCount(this);
double bytesPerRow = getRowType().getFieldCount() * 4;
return planner.getCostFactory().makeCost(Util.nLogN(rowCount) * bytesPerRow, rowCount, 0);
}
/**
* Creates new RelNodes replacing/removing the original project/row scan
*
* @param projectedScan new scan that is now projected
* @param origProject original projection
* @param needRename true if fields from the row scan need to be renamed
* @param newProject projection that contains the new projection expressions, in the case where
* the original projection cannot be removed because it projects expressions
* @return new RelNode
*/
public RelNode createNewRelNode(
RelNode projectedScan, ProjectRel origProject, boolean needRename, ProjectRel newProject) {
RelNode scanRel;
if (needRename) {
// Replace calling convention with FENNEL_EXEC_CONVENTION
RelTraitSet traits = RelOptUtil.clone(origProject.getTraits());
traits.setTrait(CallingConventionTraitDef.instance, FennelRel.FENNEL_EXEC_CONVENTION);
if (!traits.equals(projectedScan.getTraits())) {
RelNode mergedProjectedScan = convert(projectedScan, traits);
RelOptPlanner planner = projectedScan.getCluster().getPlanner();
// register projectedScan == mergedProjectedScan
// so mergedProjectedScan will have a set later on
projectedScan = planner.ensureRegistered(mergedProjectedScan, projectedScan);
}
scanRel =
new FennelRenameRel(
origProject.getCluster(),
projectedScan,
RelOptUtil.getFieldNames(origProject.getRowType()),
traits);
} else {
scanRel = projectedScan;
}
if (newProject == null) {
return scanRel;
} else {
// in the case where the projection had expressions, put the
// new, modified projection on top of the projected row scan
return (ProjectRel)
CalcRel.createProject(
scanRel,
newProject.getProjectExps(),
RelOptUtil.getFieldNames(newProject.getRowType()));
}
}
/** Creates a cluster. */
RelOptCluster(
RelOptQuery query,
RelOptPlanner planner,
RelDataTypeFactory typeFactory,
RexBuilder rexBuilder) {
assert planner != null;
assert typeFactory != null;
this.query = query;
this.planner = planner;
this.typeFactory = typeFactory;
this.rexBuilder = rexBuilder;
this.originalExpression = rexBuilder.makeLiteral("?");
// set up a default rel metadata provider,
// giving the planner first crack at everything
metadataProvider = new DefaultRelMetadataProvider();
this.emptyTraitSet = planner.emptyTraitSet();
}
public RelOptCost computeSelfCost(RelOptPlanner planner) {
double dRows = RelMetadataQuery.getRowCount(this);
double dCpu = RelMetadataQuery.getRowCount(getChild()) * program.getExprCount();
double dIo = 0;
return planner.makeCost(dRows, dCpu, dIo);
}