Github user dbtsai commented on the issue:
https://github.com/apache/spark/pull/22160
Because of the `printWelcome` message regression described in
`https://issues.apache.org/jira/browse/SPARK-25138`, to have our users best
experience, @gatorsmile and I agree that we either revert the Scala upgrade or
merge https://github.com/apache/spark/pull/21749 which uses reflection to fix
the printing ordering.
I'm leaning toward merging https://github.com/apache/spark/pull/21749 since
I worry reverting the scala upgrade will break the work for Scala 2.12. On the
other hand, fixing the printing ordering using reflection is not clean.
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