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https://issues.apache.org/jira/browse/SPARK-27681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837907#comment-16837907
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Sean Owen commented on SPARK-27681:
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One last thought for now ... when {{Seq}} becomes {{immutable}} we may find
some code doesn't compile as it is only returning {{collection.Seq}}. We may at
least have to update a lot of methods to explicitly specify the more generic
{{Seq}} anyway. But can keep it to just that much change.
> 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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