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https://issues.apache.org/jira/browse/SPARK-20346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15970285#comment-15970285
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Hyukjin Kwon commented on SPARK-20346:
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Actually, I and [~a1ray] had a discussion about this in a PR related with this
(missing values in pivot's output). It will be {{0}} for {{count}} currently
but it seems {{null}} for others. Up to my knowledge, this one is related with
it. I guess he has a better idea about this.
> sum aggregate over empty Dataset gives null
> -------------------------------------------
>
> Key: SPARK-20346
> URL: https://issues.apache.org/jira/browse/SPARK-20346
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Jacek Laskowski
> Priority: Minor
>
> {code}
> scala> spark.range(0).agg(sum("id")).show
> +-------+
> |sum(id)|
> +-------+
> | null|
> +-------+
> scala> spark.range(0).agg(sum("id")).printSchema
> root
> |-- sum(id): long (nullable = true)
> {code}
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