[GitHub] [lucene] jpountz commented on a change in pull request #426: Javadocs, Sorter impls:

[GitBox <gi...@apache.org>]

jpountz commented on a change in pull request #426:
URL: https://github.com/apache/lucene/pull/426#discussion_r743484713



##########
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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