@Test
void can_collect_group_by_items_in_group_by_clause() {

  QuerySpecification querySpec = collect(
      "SELECT name, ABS(age) FROM test GROUP BY name, ABS(age)");
  assertEquals(
      ImmutableList.of(
          qualifiedName("name"),
          function("ABS", qualifiedName("age"))),
      querySpec.getGroupByItems());
}