alamb commented on a change in pull request #1624:
URL: https://github.com/apache/arrow-datafusion/pull/1624#discussion_r789801367
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File path: datafusion/src/physical_plan/sorts/sort_preserving_merge.rs
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@@ -280,7 +287,11 @@ pub(crate) struct SortPreservingMergeStream {
///
Review comment:
it looks like the comments here need to be updated (they still refer to
`SortKeyCursor`)
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File path: datafusion/src/physical_plan/sorts/sort_preserving_merge.rs
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@@ -280,7 +287,11 @@ pub(crate) struct SortPreservingMergeStream {
///
/// Exhausted cursors will be popped off the front once all
/// their rows have been yielded to the output
- cursors: Vec<VecDeque<Arc<SortKeyCursor>>>,
+ batches: Vec<VecDeque<Arc<RecordBatch>>>,
Review comment:
Mechanically the changes in this PR make sense to me, but I don't quite
follow how the elements in `batches` correspond to the cursors in `min_heap`
(especially the code that drains all by the last `RecordBatch`
[below](https://github.com/apache/arrow-datafusion/pull/1624/files#diff-0cd58001ad86fb06e8667fdac3d89409b4624fb2a21c882484beeaf00c9f5df7R528-R531).
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