// 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;
}
/** 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);
}
