For those interested, here's the first significant problem I see that
will require separate source trees or a breaking change:
https://issues.apache.org/jira/browse/SPARK-27683?focusedCommentId=16837967&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16837967
Intere
If the number of changes that would require two source trees are small, another
thing we can do is to reach out to the Scala team and kindly ask them whether
they could change Scala 2.13 itself so it'd be easier to maintain compatibility
with Scala 2.12.
On Sat, May 11, 2019 at 4:25 PM, Sean Ow
