JanKaul commented on issue #3777:
URL: 
https://github.com/apache/arrow-datafusion/issues/3777#issuecomment-1316582955

   > Does it make sense to make the interface async at both the 
`CatalogProvider` and `SchemaProvider` level? I haven't really looked through 
the concrete use cases but it seems like we could make `SchemaProvider` async 
but still have `CatalogProvider` be sync. If a particular implementation needed 
to prefetch metadata (meta-metadata?) then that could be something handled at 
construction for that implementation.
   
   That's also a good point. I guess this would work for most use cases. On the 
other hand I think the biggest burden is to change the public interface of 
datafusion and update the dependencies. If the dependiencies have to be updated 
due to changes in `SchemaProvider`, I think also updating the interface for 
`CatalogProvider` is just a minor issue. And one avoids a potential breaking 
change in the future, in case there are use cases for an async 
`CatalogProvider`. Overall, I think having an async interface is a cleaner 
solution.


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