alamb commented on issue #814:
URL: https://github.com/apache/arrow-rs/issues/814#issuecomment-936031238


   @nevi-me  and @paddyhoran  since it looks like you involved in the initial 
implementation of `UnionArray` I wonder if you have thoughts.
   
   the arrow2 implementation appears to use a `bool` to encode sparseness: 
https://github.com/jorgecarleitao/arrow2/blob/55c3f9cf31f8fd0bc9c49f48d6265f07e2367ec8/src/datatypes/mod.rs#L95-L96
 
   
   cc @jorgecarleitao 
   
   It may be the case that we simply "wait for arrow2" and not do this ticket


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