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https://issues.apache.org/jira/browse/SPARK-3285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14113713#comment-14113713
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Apache Spark commented on SPARK-3285:
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User 'watermen' has created a pull request for this issue:
https://github.com/apache/spark/pull/2182
> Using values.sum is easier to understand than using values.foldLeft(0)(_ + _)
> -----------------------------------------------------------------------------
>
> Key: SPARK-3285
> URL: https://issues.apache.org/jira/browse/SPARK-3285
> Project: Spark
> Issue Type: Test
> Components: Examples
> Affects Versions: 1.0.2
> Reporter: Yadong Qi
>
> def sumB >: A: B = foldLeft(num.zero)(num.plus)
> Using values.sum is easier to understand than using values.foldLeft(0)(_ + ),
> so we'd better use values.sum instead of values.foldLeft(0)( + _)
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