yonipeleg33 commented on code in PR #23606:
URL: https://github.com/apache/datafusion/pull/23606#discussion_r3595735123
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datafusion/physical-plan/src/sorts/merge.rs:
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@@ -375,7 +396,10 @@ impl<C: CursorValues> SortPreservingMergeStream<C> {
let _ = cursor.advance();
if cursor.is_finished() {
// Take the current cursor, leaving `None` in its place
- self.prev_cursors[stream_idx] =
self.cursors[stream_idx].take();
+ let taken = self.cursors[stream_idx].take();
+ if self.enable_round_robin_tie_breaker {
+ self.prev_cursors.as_mut().expect("prev_cursor should be
set when round robin tie breaker is enabled")[stream_idx] = taken;
+ }
Review Comment:
The expect() check seems a bit redundant, just match on the option directly
```suggestion
if let Some(prev_cursors) = self.prev_cursors.as_mut() {
prev_cursors[stream_idx] = taken;
}
```
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