public List<String> getNotSupportedKeyTypes() {
    return notSupportedKeyTypes;
  }
VectorGroupByDesc.

Extra parameters beyond MapJoinDesc just for the vector map join operators.

We don't extend MapJoinDesc because the base OperatorDesc doesn't support
clone and adding it is a lot work for little gain.
ql/src/java/org/apache/hadoop/hive/ql/plan/VectorMapJoinDesc.java