@Explain(vectorization = Vectorization.SUMMARY, displayName = "allNative",
        explainLevels = { Level.DEFAULT, Level.EXTENDED })
    public Boolean nativeVectorized() {
      if (!baseWork.getVectorMode()) {
        return null;
      }
      return baseWork.getAllNative();
    }
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