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https://issues.apache.org/jira/browse/SPARK-27681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-27681:
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Description: {{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. In many cases, this will be
fine, as Spark users using Scala 2.13 will also have this changed alias. In
some cases it may be undesirable, as it will cause some code to compile in 2.12
but not in 2.13. In some cases, making the type {{scala.collection.Seq}}
explicit so that it doesn't vary can help avoid this, so that Spark apps might
cross-compile for 2.12 and 2.13 with the same source. (was: {{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}}.)
> 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. In many cases, this will be
> fine, as Spark users using Scala 2.13 will also have this changed alias. In
> some cases it may be undesirable, as it will cause some code to compile in
> 2.12 but not in 2.13. In some cases, making the type {{scala.collection.Seq}}
> explicit so that it doesn't vary can help avoid this, so that Spark apps
> might cross-compile for 2.12 and 2.13 with the same source.
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