@Test
public void testFromClause() {

  Parser<List<Relation>> parser = RelationParser.fromClause(TABLE);
  assertListParser(parser, "from a", table("a"));
  assertListParser(parser, "from a x", new AliasedRelation(table("a"), "x"));
  assertListParser(parser, "from table1 t1, t2",
      new AliasedRelation(table("table1"), "t1"), table("t2"));
}