@Explain(vectorization = Vectorization.DETAIL, displayName = "rowBatchContext",
        explainLevels = { Level.DEFAULT, Level.EXTENDED })
    public RowBatchContextExplainVectorization vectorizedRowBatchContext() {
      if (!baseWork.getVectorMode()) {
        return null;
      }
      return new RowBatchContextExplainVectorization(baseWork.getVectorizedRowBatchCtx());
    }
Returns a set containing all leaf operators from the operator tree in this work.
@return a set containing all leaf operators in this operator tree.
ql/src/java/org/apache/hadoop/hive/ql/plan/BaseWork.java