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https://issues.apache.org/jira/browse/SPARK-25075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837417#comment-16837417
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Stefan Zeiger commented on SPARK-25075:
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Returning a Seq is not a problem but if you want it to be a scala.Seq it needs
to be immutable now. Nothing changes if you always use scala.collection.Seq or
scala.collection.immutable.Seq explicitly. This is recommended for
cross-building.
The main problem with Seq is the interaction with varargs. They are of type
scala.Seq so you cannot pass an existing mutable Seq to a varargs method with
`_*` anymore.
> Build and test Spark against Scala 2.13
> ---------------------------------------
>
> Key: SPARK-25075
> URL: https://issues.apache.org/jira/browse/SPARK-25075
> Project: Spark
> Issue Type: Umbrella
> Components: Build, Project Infra
> Affects Versions: 3.0.0
> Reporter: Guillaume Massé
> Priority: Major
>
> This umbrella JIRA tracks the requirements for building and testing Spark
> against the current Scala 2.13 milestone.
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