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https://issues.apache.org/jira/browse/SPARK-46124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean R. Owen resolved SPARK-46124.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 44041
[https://github.com/apache/spark/pull/44041]
> Replace explicit `ArrayOps#toSeq` with
> `s.c.immutable.ArraySeq.unsafeWrapArray`
> --------------------------------------------------------------------------------
>
> Key: SPARK-46124
> URL: https://issues.apache.org/jira/browse/SPARK-46124
> Project: Spark
> Issue Type: Sub-task
> Components: DStreams, Kubernetes, ML, MLlib, Spark Core, SQL,
> Structured Streaming, YARN
> Affects Versions: 4.0.0
> Reporter: Yang Jie
> Assignee: Yang Jie
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> There is a behavioral difference between Scala 2.13 and 2.12 for explicit
> `ArrayOps.toSeq` calls, similar to the implicit conversion from `Array` to
> `Seq`.
> In Scala 2.12, it returns a `mutable.WrappedArray`, which does not involve a
> collection copy.
> ```scala
> Welcome to Scala 2.12.18 (OpenJDK 64-Bit Server VM, Java 17.0.9).
> Type in expressions for evaluation. Or try :help.
> scala> Array(1,2,3).toSeq
> res0: Seq[Int] = WrappedArray(1, 2, 3)
> ```
> However, in Scala 2.13, it returns an `immutable.ArraySeq` that with
> collection copy.
> Since we have always used the non-collection copy behavior for this explicit
> conversion in the era of Scala 2.12, it is safe to assume that no collection
> copy is needed for Scala 2.13.
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