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)
      Literal NULL
      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)\'
