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https://issues.apache.org/jira/browse/SPARK-5680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14584324#comment-14584324
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Holman Lan commented on SPARK-5680:
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Hi Guys,
Just curious about this change to return 0 for the SUM function when all values
are NULL as many other data sources (Hive, Impala, SQL Server ...) return NULL
in this case. Could you kindly share the motivation behind the change?
Many thanks,
Holman
> 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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