Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22977#discussion_r231866958 --- Diff: project/MimaBuild.scala --- @@ -88,7 +88,7 @@ object MimaBuild { def mimaSettings(sparkHome: File, projectRef: ProjectRef) = { val organization = "org.apache.spark" - val previousSparkVersion = "2.2.0" + val previousSparkVersion = "2.4.0" --- End diff -- up to my understanding, we should have changed it to 2.3.0 when 2.3.0 was released. Maybe we should send a another PR to branch-2.4 and change it to 2.3.0
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