rluvaton commented on code in PR #17163:
URL: https://github.com/apache/datafusion/pull/17163#discussion_r2288446359


##########
datafusion/physical-plan/src/sorts/sort.rs:
##########
@@ -673,14 +756,13 @@ impl ExternalSorter {
             .into_iter()
             .map(|batch| {
                 let metrics = self.metrics.baseline.intermediate();
-                let reservation = self
-                    .reservation
-                    .split(get_reserved_byte_for_record_batch(&batch));
+                let reservation = self.reservation.split(
+                    get_reserved_byte_for_record_batch(&batch, 
self.cursor_batch_ratio),
+                );

Review Comment:
   `sort_batch_stream` sort a single batch using `sort_batch` why there is a 
need for `cursor_batch_ratio` here? isn't it only used when using 
`SortPreservingMergeStream` with cursor sort key fallback



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