mbrobbel commented on PR #5585:
URL: https://github.com/apache/arrow-rs/pull/5585#issuecomment-2036782403

   > I think it would be good to understand the motivating use-case for this, 
as AFAICT the output of into_parts wouldn't be useful for reconstructing a 
UnionArray
   
   My use-case is [zero-copy 
conversion](https://github.com/mbrobbel/narrow/blob/2ab7e0436f6530289ebba38c4ce344570a26926f/src/arrow/array/union.rs#L133-L181)
 to a different union array type ([test example 
here](https://github.com/mbrobbel/narrow/blob/2ab7e0436f6530289ebba38c4ce344570a26926f/src/arrow/array/union.rs#L221-L244)).
   
   I'm not using it to reconstruct an `arrow_array::array::UnionArray`, however 
the added test in this PR shows how that can be done.
   
   


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