@Override
  public OperatorType getType() {
    return OperatorType.LATERALVIEWFORWARD;
  }
LateralViewForwardOperator. This operator sits at the head of the operator
DAG for a lateral view. This does nothing, but it aids the predicate push
down during traversal to identify when a lateral view occurs.
ql/src/java/org/apache/hadoop/hive/ql/exec/LateralViewForwardOperator.java