alamb commented on a change in pull request #236:
URL: https://github.com/apache/arrow-rs/pull/236#discussion_r623307282



##########
File path: arrow/src/compute/kernels/sort.rs
##########
@@ -487,24 +487,27 @@ where
         len = limit.min(len);
     }
     if !descending {
-        sort_by(&mut valids, len - nulls_len, |a, b| cmp(a.1, b.1));
+        sort_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {

Review comment:
       🤔  I think you are right.... Let me take a closer look




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