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From "Guillaume Martres (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-29292) Fix internal usages of mutable collection for Seq in 2.13
Date Sun, 03 May 2020 00:14:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-29292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17098141#comment-17098141
] 

Guillaume Martres commented on SPARK-29292:
-------------------------------------------

Seq in 2.13 is a scala.collection.immutable.Seq, which is a subtype of scala.collection.Seq,
so if a method takes a scala.collection.Seq as parameter then it will accept both a 2.12 and
a 2.13 plain Seq as input (on the other hand, if the result type of a method is a scala.collection.Seq,
then it can't be assigned to a plain Seq in 2.13).

> 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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