Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/12632#discussion_r60839935 --- Diff: core/src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java --- @@ -82,37 +81,37 @@ public static long computePrefix(double value) { // public static final class UnsignedPrefixComparator extends RadixSortSupport { - @Override public final boolean sortDescending() { return false; } - @Override public final boolean sortSigned() { return false; } + @Override public boolean sortDescending() { return false; } + @Override public boolean sortSigned() { return false; } @Override - public final int compare(long aPrefix, long bPrefix) { + public int compare(long aPrefix, long bPrefix) { return UnsignedLongs.compare(aPrefix, bPrefix); } } public static final class UnsignedPrefixComparatorDesc extends RadixSortSupport { - @Override public final boolean sortDescending() { return true; } - @Override public final boolean sortSigned() { return false; } + @Override public boolean sortDescending() { return true; } + @Override public boolean sortSigned() { return false; } @Override - public final int compare(long bPrefix, long aPrefix) { + public int compare(long bPrefix, long aPrefix) { --- End diff -- Oh, it's definitely final. It's just `RedundantModifier` error since the class `SignedPrefixComparator` is already `final`.
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