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java.lang.IllegalArgumentException: Comparison method violates its general contract!	at org.apache.spark.util.collection.Sorter$SortState.mergeLo(Sorter.java:755)	at org.apache.spark.util.collection.Sorter$SortState.mergeAt(Sorter.java:493)	at org.apache.spark.util.collection.Sorter$SortState.mergeCollapse(Sorter.java:420)	at org.apache.spark.util.collection.Sorter$SortState.access$200(Sorter.java:294)	at org.apache.spark.util.collection.Sorter.sort(Sorter.java:128)	at org.apache.spark.util.collection.SizeTrackingPairBuffer.destructiveSortedIterator(SizeTrackingPairBuffer.scala:83)	at org.apache.spark.util.collection.ExternalSorter.spillToMergeableFile(ExternalSorter.scala:323)	at org.apache.spark.util.collection.ExternalSorter.spill(ExternalSorter.scala:271)	at org.apache.spark.util.collection.ExternalSorter.maybeSpill(ExternalSorter.scala:249)	at org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:220)	at org.apache.spark.shuffle.sort.SortShuffleWriter.write(SortShuffleWriter.scala:85)	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:68)	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)	at org.apache.spark.scheduler.Task.run(Task.scala:54)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:199)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)