SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier res
    Function if (alias res) (children 1)
     ExpressionList (children 3)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal NULL
          Literal \'Nullable(UInt8)\'
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal Array_[UInt64_1, UInt64_2, UInt64_3]
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'str_1\'
        Literal \'Nullable(String)\'
