@Override
  public <R, P> R accept(RexBiVisitor<R, P> visitor, P arg) {
    throw new UnsupportedOperationException();
  }
This class represents the equivalent to {@link ExprNodeColumnListDesc}
in a Calcite expression. It is not supposed to be used through planning
and should be immediately expanded after it has been generated by
the parser.
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/reloperators/HiveRexExprList.java