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https://issues.apache.org/jira/browse/SPARK-8828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641835#comment-14641835
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Apache Spark commented on SPARK-8828:
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User 'yjshen' has created a pull request for this issue:
https://github.com/apache/spark/pull/7667
> Revert the change of SPARK-5680
> -------------------------------
>
> Key: SPARK-8828
> URL: https://issues.apache.org/jira/browse/SPARK-8828
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.3.1, 1.4.0
> Reporter: Yin Huai
> Priority: Critical
>
> SPARK-5680 introduced a bug to sum function. After this change, when all
> input values are nulls, it returns 0.0 instead of null, which is wrong.
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