Hi Louis, It just happens they aren't implemented, I don't think there's any particular reason. I've filed ARROW-17214 [1] to track this.
[1]: https://issues.apache.org/jira/browse/ARROW-17214 -David On Tue, Jul 26, 2022, at 05:19, Louis C wrote: > Hello, > > I use scalar casts to STRING type as a way to represent easily the more > complex arrow types such as STRUCT or UNION. For these types, the Scalar cast > (CastTo method) is correctly implemented, giving results such as :"union{1: > bool = false}" > However, when casting LIST, LARGE_LIST or MAP types, it gives NotImplemented > error. > Is there a particular reason why it is the case ? > Is it planned to make it work ? > > Best regards > Louis C
