pepijnve commented on code in PR #16322:
URL: https://github.com/apache/datafusion/pull/16322#discussion_r2137438301
##########
datafusion/physical-plan/src/sorts/merge.rs:
##########
@@ -216,36 +212,50 @@ impl<C: CursorValues> SortPreservingMergeStream<C> {
// Once all partitions have set their corresponding cursors for the
loser tree,
// we skip the following block. Until then, this function may be
called multiple
// times and can return Poll::Pending if any partition returns
Poll::Pending.
+
if self.loser_tree.is_empty() {
- while let Some(&partition_idx) =
self.uninitiated_partitions.front() {
+ // Manual indexing since we're iterating over the vector and
shrinking it in the loop
+ let mut idx = 0;
+ while idx < self.uninitiated_partitions.len() {
Review Comment:
I'm new to this, so maybe my mental model is completely wrong, but I don't
think that's correct. This is not an async function. It will iterate over all
the partitions once per call to `poll_next_inner` and return at line 257 unless
`uninitiated_partitions` is empty.
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