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https://issues.apache.org/jira/browse/SPARK-32408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon updated SPARK-32408:
---------------------------------
    Description: 
After SPARK-32245, crossPaths was disabled in SBT build to run the Junit tests 
per project properly.
This is correct change since we're not doing the cross build in SBT.

Now, the intermediate classes are placed without Scala version directory in SBT 
build specifically.
It seems causing side effects that are dependent on that path. See, for 
example, {{git grep \-r "target/scala\-"}}.

To minimise the side effects, we should enable crossPaths back for now.

This is actually an issue in Jenkins jobs as well. See 
https://github.com/apache/spark/pull/29205 for the analysis made.

  was:
After SPARK-32245, crossPaths was disabled in SBT build to run the Junit tests 
per project properly.
This is correct change since we're not doing the cross build in SBT.

Now, the intermediate classes are placed without Scala version directory in SBT 
build specifically.
It seems causing side effects that are dependent on that path. See, for 
example, {{git grep \-r "target/scala\-"}}.

To minimise the side effects, we should enable crossPaths back for now.

This is actually an issue in Jenkins jobs as well. See 


> Enable crossPaths back to prevent side effects
> ----------------------------------------------
>
>                 Key: SPARK-32408
>                 URL: https://issues.apache.org/jira/browse/SPARK-32408
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Build
>    Affects Versions: 3.1.0
>            Reporter: Hyukjin Kwon
>            Priority: Major
>
> After SPARK-32245, crossPaths was disabled in SBT build to run the Junit 
> tests per project properly.
> This is correct change since we're not doing the cross build in SBT.
> Now, the intermediate classes are placed without Scala version directory in 
> SBT build specifically.
> It seems causing side effects that are dependent on that path. See, for 
> example, {{git grep \-r "target/scala\-"}}.
> To minimise the side effects, we should enable crossPaths back for now.
> This is actually an issue in Jenkins jobs as well. See 
> https://github.com/apache/spark/pull/29205 for the analysis made.



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