Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/22079
The original fix
https://github.com/apache/spark/pull/22079/commits/efccc028bce64bf4754ce81ee16533c19b4384b2
has been merged to Spark 2.3. After 5+ months, we have not received any
correctness regression that is caused by this fix, although this fix definitely
will introduce a performance regression. I think we should merge it. The
general risk is not very high and it resolves a serious correctness bug.
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