SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function extractAllGroupsHorizontal (children 1)
     ExpressionList (children 2)
      Literal \'hello world\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'(\\\\w+)\'
        Literal \'FixedString(5)\'
