public static PredicateLeaf createPredicateLeaf(PredicateLeaf.Operator operator,
                                                  PredicateLeaf.Type type,
                                                  String columnName,
                                                  Object literal,
                                                  List<Object> literalList) {
    return new SearchArgumentImpl.PredicateLeafImpl(operator, type, columnName,
        literal, literalList, null);
  }
Create a predicate leaf. This is used by another test.
ql/src/test/org/apache/hadoop/hive/ql/io/sarg/TestSearchArgumentImpl.java