yahoNanJing commented on PR #3839:
URL: https://github.com/apache/arrow-rs/pull/3839#issuecomment-1480694002

   > Now that rust supports trait upcasting you might be able to just make 
ObjectStore: Any
   
   Hi @tustvold, I'm afraid we still need to add the as_any() interface to the 
trait. Based on https://github.com/apache/arrow-datafusion/pull/5543, I 
factored previous code. However, it doesn't work as expected. See the UT fails 
in 
https://github.com/yahoNanJing/arrow-ballista/blob/dev-20230322/ballista/core/src/cache_layer/object_store/mod.rs
   
   Or maybe there are other correct way to downcast an `Arc<dyn ObjectStore>`. 
https://github.com/yahoNanJing/arrow-ballista/blob/dev-20230322/ballista/core/src/cache_layer/object_store/mod.rs?plain=1#L31-L39


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