How to use

getTraitSet

method

in

org.apache.calcite.rel.core.Window

  @Override
  public RelNode convert(RelNode rel) {
    final Window window = (Window) rel;
    final RelTraitSet traitSet = window.getTraitSet().replace(OLAPRel.CONVENTION);
    final RelNode input = window.getInput();
    return new OLAPWindowRel(rel.getCluster(), traitSet,
        convert(input, input.getTraitSet().replace(OLAPRel.CONVENTION)), window.constants, window.getRowType(),
        window.groups);
  }
}

  @Override
  public RelNode convert(RelNode rel) {
    final Window window = (Window) rel;
    final RelTraitSet traitSet = window.getTraitSet().replace(OLAPRel.CONVENTION);
    final RelNode input = window.getInput();
    return new OLAPWindowRel(rel.getCluster(), traitSet,
        convert(input, input.getTraitSet().replace(OLAPRel.CONVENTION)), window.constants, window.getRowType(),
        window.groups);
  }
}

 @Override
 public void onMatch(RelOptRuleCall call) {
  final Window window = call.rel(0);
  final RelNode input = call.rel(1);
  final RelTraitSet traits = window.getTraitSet().plus(Rel.LOGICAL);
  final RelNode convertedInput = convert(input, traits.simplify());
  call.transformTo(
    new WindowRel(
      window.getCluster(),
      traits,
      convertedInput,
      window.constants,
      window.getRowType(),
      window.groups));
 }
}

 @Override
 public void onMatch(RelOptRuleCall call) {
  final Window window = call.rel(0);
  final RelNode input = call.rel(1);
  final RelTraitSet traits = window.getTraitSet().plus(DrillRel.DRILL_LOGICAL).simplify();
  final RelNode convertedInput = convert(input, traits);
  call.transformTo(
    new DrillWindowRel(
      window.getCluster(),
      traits,
      convertedInput,
      window.constants,
      window.getRowType(),
      window.groups));
 }
}