friendlymatthew commented on PR #8937:
URL: https://github.com/apache/arrow-rs/pull/8937#issuecomment-3647752009

   > If we are going to do this, I think we should clearly document somewhere 
what "equal" means for `DataType::Union` and `UnionArray` and make sure the 
crate is consistent with this definition
   
   I agree that we should document what "equal" means for `DataType::Union` and 
`UnionArray`. 
   
   But isn't `DataType::equals_datatype` already the authoritative definition 
of equality for `DataType::Union`? 
   
   The specific match arm for unions is here: 
   
https://github.com/apache/arrow-rs/blob/08dcc0b8c552e81d612b53bc0ab2a0007bfe20a1/arrow-schema/src/datatype.rs#L676-L688
   
   


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