Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/10606#discussion_r48911600 --- Diff: core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorter.java --- @@ -99,7 +99,11 @@ public UnsafeInMemorySorter( this.consumer = consumer; this.memoryManager = memoryManager; this.sorter = new Sorter<>(UnsafeSortDataFormat.INSTANCE); - this.sortComparator = new SortComparator(recordComparator, prefixComparator, memoryManager); + if (recordComparator != null) { --- End diff -- `recordComparator` is nullable? That's surprising to me. If `recordComparator` is null, does that also imply that `prefixComparator` is null? Can we put `@Nullable` annotations on the parameter so that IntelliJ's fancy nullability handling checks work properly?
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