jpountz commented on a change in pull request #426:
URL: https://github.com/apache/lucene/pull/426#discussion_r743484713
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File path: lucene/core/src/java/org/apache/lucene/util/InPlaceMergeSorter.java
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@@ -18,7 +18,10 @@
/**
* {@link Sorter} implementation based on the merge-sort algorithm that merges
in place (no extra
- * memory will be allocated). Small arrays are sorted with insertion sort.
+ * memory will be allocated). Small arrays are sorted with binary sort.
+ *
+ * <p>This algorithm is stable. It's especially suited to sorting small lists
where we'd rather
+ * optimize for avoiding allocating memory for this task.
Review comment:
While we're adding this, maybe also mention that it performs well on
lists that are already sorted.
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