How to use

getCluster

method

in

org.apache.calcite.rel.core.Window

 @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));
 }
}