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https://issues.apache.org/jira/browse/SPARK-27681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837753#comment-16837753
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Marcelo Vanzin commented on SPARK-27681:
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bq. we don't need to do this until we support Scala 2.13

I guess my question is why do we need to do it? Your explanation above 
indicates that the {{Seq}} alias in 2.13 will just be a different type. That's 
fine since 2.12 and 2.13 builds are not binary compatible anyway.

I'd understand this change if the {{Seq}} alias was being removed altogether 
and you'd need an explicit import, but that doesn't seem to be the case.

> Use scala.collection.Seq explicitly instead of scala.Seq alias
> --------------------------------------------------------------
>
>                 Key: SPARK-27681
>                 URL: https://issues.apache.org/jira/browse/SPARK-27681
>             Project: Spark
>          Issue Type: Sub-task
>          Components: ML, MLlib, Spark Core, SQL, Structured Streaming
>    Affects Versions: 3.0.0
>            Reporter: Sean Owen
>            Assignee: Sean Owen
>            Priority: Major
>
> {{scala.Seq}} is widely used in the code, and is an alias for 
> {{scala.collection.Seq}} in Scala 2.12. It will become an alias for 
> {{scala.collection.immutable.Seq}} in Scala 2.13. To avoid API changes, we 
> should simply explicit import and use {{scala.collection.Seq}}.



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