Dandandan commented on a change in pull request #722:
URL: https://github.com/apache/arrow-datafusion/pull/722#discussion_r671825464
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File path: datafusion/src/physical_plan/sort_preserving_merge.rs
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@@ -246,7 +274,19 @@ impl SortKeyCursor {
.zip(other.columns.iter())
.zip(options.iter());
- for ((l, r), sort_options) in zipped {
+ // Recall or initialise a collection of comparators for comparing
+ // columnar arrays of this cursor and "other".
+ let cmp = self
+ .batch_comparators
+ .entry(other.batch_idx)
+ .or_insert_with(|| Vec::with_capacity(other.columns.len()));
Review comment:
Don't we need to clean older `batch_idx` over time?
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