Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19113
Since the expected release of our next version Spark 2.3 is the end of this
year, we still can revert it back to 2.2.1 if we realize this release 2.5.4
introduces new bugs or performance regression.
I am fine to merge it now. Let @rxin @marmbrus @cloud-fan do the final
confirm.
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