Github user dongjoon-hyun commented on the issue: https://github.com/apache/spark/pull/22633 It turns out that we didn't check Scala 2.12 build. - https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-master-test-maven-hadoop-2.7-ubuntu-scala-2.12/428/console I'll make a follow-up.
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