SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayStringConcat (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function array (children 1)
         ExpressionList (children 2)
          Function CAST (children 1)
           ExpressionList (children 2)
            Literal NULL
            Literal \'Nullable(String)\'
          Function CAST (children 1)
           ExpressionList (children 2)
            Literal NULL
            Literal \'Nullable(String)\'
      Literal \';\'