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From "Hyukjin Kwon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-20346) sum aggregate over empty Dataset gives null
Date Sun, 16 Apr 2017 08:22:42 GMT

    [ https://issues.apache.org/jira/browse/SPARK-20346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15970285#comment-15970285
] 

Hyukjin Kwon commented on SPARK-20346:
--------------------------------------

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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