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https://issues.apache.org/jira/browse/SPARK-8828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14614514#comment-14614514
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Yin Huai commented on SPARK-8828:
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We also need to take a look at if we need CombinSum (introduced by SPARK-5680).
If not, we can also remove the change of
https://issues.apache.org/jira/browse/SPARK-6451.
> Revert the change of SPARK-5680
> -------------------------------
>
> Key: SPARK-8828
> URL: https://issues.apache.org/jira/browse/SPARK-8828
> Project: Spark
> Issue Type: Bug
> 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 there is
> no input to a sum function (or all input values are nulls), it returns 0.0
> instead of null, which is wrong.
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