alamb commented on issue #6247:
URL: https://github.com/apache/arrow-rs/issues/6247#issuecomment-2292396229

   > Much as route 1. (very lax casting of unions) would simplify my use case, 
in writing this up I realised that probably doesn't make much sense in general.
   
   Yeah -- I think of a Union as the way in arrow to represent a dynamically 
typed value: each row of a union can be one of a set of different types
   
   So I guess if we are casting from a union array to another type, I would as 
a user expect that each row of the union (regardless of what variant it was) 
would be cast to the target type


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