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https://issues.apache.org/jira/browse/SPARK-29292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17096876#comment-17096876
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Guillaume Martres edited comment on SPARK-29292 at 4/30/20, 6:47 PM:
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Thanks [~srowen], I got spark to compile with Scala 2.13.2 based on this
branch, cf
https://issues.apache.org/jira/browse/SPARK-25075?focusedCommentId=17096870&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17096870.
But I think that the use of .toSeq should be reconsidered since it means
copying on Scala 2.13 for mutable collections. Instead, I think that usages of
scala.Seq should be replaced by scala.collection.Seq when it makes sense to do
so.
was (Author: smarter):
Thanks [~srowen], I got spark to compile with Scala 2.13.2 based on this
branch, cf
https://issues.apache.org/jira/browse/SPARK-25075?focusedCommentId=17096870&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17096870.
But I think that the use of .toSeq should be reconsidered since it means
copying on Scala 2.13. Instead, I think that usages of scala.Seq should be
replaced by scala.collection.Seq when it makes sense to do so.
> Fix internal usages of mutable collection for Seq in 2.13
> ---------------------------------------------------------
>
> Key: SPARK-29292
> URL: https://issues.apache.org/jira/browse/SPARK-29292
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Affects Versions: 3.0.0
> Reporter: Sean R. Owen
> Assignee: Sean R. Owen
> Priority: Minor
>
> Kind of related to https://issues.apache.org/jira/browse/SPARK-27681, but a
> simpler subset.
> In 2.13, a mutable collection can't be returned as a
> {{scala.collection.Seq}}. It's easy enough to call .toSeq on these as that
> still works on 2.12.
> {code}
> [ERROR] [Error]
> /Users/seanowen/Documents/spark_2.13/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala:467:
> type mismatch;
> found : Seq[String] (in scala.collection)
> required: Seq[String] (in scala.collection.immutable)
> {code}
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