@Override
  public String getDisplayString(String[] children) {
    assert (children.length >= 1 && children.length <= 3);
    return getStandardDisplayString("sentences", children);
  }
GenericUDFSentences: splits a natural language chunk of text into sentences and words.
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFSentences.java