Enumerable rules lost hint info

[JiaTao Tao]

Hi
Recently, I'm integrating Calcite's hint into our system, and I've found
the Enumerable rules just throw the hint info(ImmutableList.of()) away:

  public EnumerableProject(
      RelOptCluster cluster,
      RelTraitSet traitSet,
      RelNode input,
      List<? extends RexNode> projects,
      RelDataType rowType) {
    super(cluster, traitSet, ImmutableList.of(), input, projects, rowType);
    assert getConvention() instanceof EnumerableConvention;
  }


Regards!

Aron Tao