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https://issues.apache.org/jira/browse/SPARK-27683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16838582#comment-16838582
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Sean Owen commented on SPARK-27683:
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Yeah if it comes to defining two source trees we can do that; was just trying
to avoid it. I think defining a type alias or using compat all involves two
source trees in some way.
Oh, 2.13 aliased TraversableOnce to IterableOnce? well, then that would do it
for us I guess.
If the alternative is for us to change the signature to accept {{T =>
Iterator[U]}}, then I wouldn't do that, and would just let TraversableOnce use
the alias in 2.13.
> Remove usage of TraversableOnce
> -------------------------------
>
> Key: SPARK-27683
> URL: https://issues.apache.org/jira/browse/SPARK-27683
> Project: Spark
> Issue Type: Sub-task
> Components: ML, Spark Core, SQL, Structured Streaming
> Affects Versions: 3.0.0
> Reporter: Sean Owen
> Assignee: Sean Owen
> Priority: Major
>
> As with {{Traversable}}, {{TraversableOnce}} is going away in Scala 2.13. We
> should use {{IterableOnce}} instead. This one is a bigger change as there are
> more API methods with the existing signature.
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