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https://issues.apache.org/jira/browse/SPARK-5680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641836#comment-14641836
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Apache Spark commented on SPARK-5680:
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User 'yjshen' has created a pull request for this issue:
https://github.com/apache/spark/pull/7667
> Sum function on all null values, should return zero
> ---------------------------------------------------
>
> Key: SPARK-5680
> URL: https://issues.apache.org/jira/browse/SPARK-5680
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Venkata Ramana G
> Assignee: Venkata Ramana G
> Priority: Minor
> Fix For: 1.3.1, 1.4.0
>
>
> SELECT sum('a'), avg('a'), variance('a'), std('a') FROM src;
> Current output:
> NULL NULL NULL NULL
> Expected output:
> 0.0 NULL NULL NULL
> This fixes hive udaf_number_format.q
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