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https://issues.apache.org/jira/browse/SPARK-1914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14007033#comment-14007033
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Takuya Ueshin commented on SPARK-1914:
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Pull-requested: https://github.com/apache/spark/pull/861
> Simplify CountFunction not to traverse to evaluate all child expressions.
> -------------------------------------------------------------------------
>
> Key: SPARK-1914
> URL: https://issues.apache.org/jira/browse/SPARK-1914
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Takuya Ueshin
>
> {{CountFunction}} should count up only if the child's evaluated value is not
> null.
> Because it traverses to evaluate all child expressions, even if the child is
> null, it counts up if one of the all children is not null.
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