crepererum commented on PR #610:
URL: 
https://github.com/apache/arrow-rs-object-store/pull/610#issuecomment-3876764204

   I should have considered this in #549. Reading the [Azure 
docs](https://learn.microsoft.com/en-us/rest/api/storageservices/blob-batch?tabs=microsoft-entra-id#request-body)
 though, I think etag matching is also supported by the bulk request variant. 
So I think we could design an API like this:
   
   
   ```rust
   pub struct DeleteLocation {
       pub path: Path,
       pub if_match: Option<String>,
   }
   
   #[derive(Debug, Clone, Default)]
   pub struct DeleteOptions {
       pub extensions: Extensions,
   }
   
   trait ObjectStore {
       fn delete_stream_opts(
           &self,
           locations: BoxStream<'static, Result<DeleteLocation>>,
           opts: DeleteOptions,
       ) -> BoxStream<'static, Result<Path>>;
   }
   
   // move `delete_stream` to `ObjectStoreExt`
   ```
   
   i.e. have the extensions ONCE but have per-location matchers.


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