[GitHub] [spark] cloud-fan commented on a change in pull request #25491: [SPARK-28699][SQL] Disable using radix sort for ShuffleExchangeExec in repartition case

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cloud-fan commented on a change in pull request #25491: [SPARK-28699][SQL] Disable using radix sort for ShuffleExchangeExec in repartition case
URL: https://github.com/apache/spark/pull/25491#discussion_r315491253
 
 

 ##########
 File path: sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/ShuffleExchangeExec.scala
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 @@ -264,7 +264,11 @@ object ShuffleExchangeExec {
             prefixComparator,
             prefixComputer,
             pageSize,
-            canUseRadixSort)
+            // As we need to compare the binary of UnsafeRow here, we can't make sure whether all
+            // the fields can sort fully with prefix like SortExec. So we disable radix sort here
+            // to avoid getting unstable sort, and result to a correctness bug.
+            // See more details in SPARK-28699.
 
 Review comment:
   how about
   ```
   we are comparing binary here, which does not support radix sort. See more details in SPARK-28699.
   ```

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