pepijnve commented on code in PR #16398:
URL: https://github.com/apache/datafusion/pull/16398#discussion_r2152379108


##########
datafusion/datasource/src/source.rs:
##########
@@ -261,11 +261,7 @@ impl ExecutionPlan for DataSourceExec {
     ) -> Result<SendableRecordBatchStream> {
         self.data_source
             .open(partition, Arc::clone(&context))
-            .map(|stream| wrap_yield_stream(stream, &context, 
self.cooperative))
-    }
-
-    fn with_cooperative_yields(self: Arc<Self>) -> Option<Arc<dyn 
ExecutionPlan>> {
-        self.cooperative.then_some(self)
+            .map(|stream| make_cooperative(stream))

Review Comment:
   We could avoid a virtual call here by pushing the cooperative wrapper down 
to `FileScanConfig::open`. That does lose the benefit of `DataSourceExec` being 
cooperative for any `DataSource`. Is it worth shaving off one virtual call per 
record batch?



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