@Test
public void test_null_like_missing() {

  FunctionExpression like = dsl.like(DSL.ref(STRING_TYPE_NULL_VALUE_FILED, STRING),
      DSL.ref(STRING_TYPE_MISSING_VALUE_FILED, STRING));
  assertEquals(BOOLEAN, like.type());
  assertEquals(LITERAL_MISSING, like.valueOf(valueEnv()));
  like = dsl.like(DSL.ref(STRING_TYPE_MISSING_VALUE_FILED, STRING),
      DSL.ref(STRING_TYPE_NULL_VALUE_FILED, STRING));
  assertEquals(BOOLEAN, like.type());
  assertEquals(LITERAL_MISSING, like.valueOf(valueEnv()));
}