comphead commented on issue #13642:
URL: https://github.com/apache/datafusion/issues/13642#issuecomment-2524709601

   Thanks for the flamegraph, indeed looks like it happens when dealing with 
working with `PartitionedStream`.  namely in 
   ```
   let cursor = self.convert_batch(&batch)?;
   ```
   and `type CursorStream<C> = Box<dyn PartitionedStream<Output = Result<(C, 
RecordBatch)>>>;` so it explains


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