SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function extractAllGroupsHorizontal (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal \'hello world\'
          Literal \'FixedString(12)\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'(\\\\w+)\'
        Literal \'FixedString(5)\'