[GitHub] [arrow] andygrove commented on a change in pull request #7969: ARROW-9753: [Rust] [DataFusion] Remove use of Mutex from DataFusion Partition trait

[GitBox <gi...@apache.org>]

andygrove commented on a change in pull request #7969:
URL: https://github.com/apache/arrow/pull/7969#discussion_r471031743



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File path: rust/arrow/src/ipc/reader.rs
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@@ -651,19 +654,20 @@ impl<R: Read + Seek> RecordBatchReader for FileReader<R> {
         self.schema.clone()
     }
 
-    fn next_batch(&mut self) -> Result<Option<RecordBatch>> {

Review comment:
       The issue is that both DataFusion and Parquet implement the same RecordBatchReader trait that requires `&mut self` and therefore requires the use of mutexes. Maybe DataFusion should have its own trait instead. I'll try that approach next.




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