xuanyuanking 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_r315491726
##########
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:
Copy, shorten it in 8bf4cc8.
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