@Override
  public String getDisplayString(String[] children) {
    assert (children.length == 3);
    return getStandardDisplayString("translate", children);
  }
Translates the input string based on {@link #replacementMap} and {@link #deletionSet} and
returns the translated string.

@param input
         input string to perform the translation on
@return translated string
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFTranslate.java