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https://issues.apache.org/jira/browse/SPARK-20346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15970281#comment-15970281
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Jacek Laskowski commented on SPARK-20346:
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[~hyukjin.kwon] Caught me! I didn't think about it much and thought 0 would be
a viable candidate, but it's not obvious to me now. The field is {{nullable}}
so...{{null}} is acceptable. I think it may be acceptable for end users (like
me) when at least it's documented in the docs (or at least in scaladoc for
{{agg}} or {{groupBy}} / {{groupByKey}}). It was weird to see {{null}} as a
numeric value.
> 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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