Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/20567
This issue does not cause the regression since
`spark.sql.execution.arrow.enabled` is off by default. We need to make it
configurable before merging it. Merging this to 2.3.0 might cause the
regression and impacts the release date of SPARK 2.3. Thus, we would suggest to
delay merging it until 2.3.0 is out.
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