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https://issues.apache.org/jira/browse/SPARK-12913?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davies Liu resolved SPARK-12913.
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Resolution: Fixed
Fix Version/s: 2.0.0
Issue resolved by pull request 10960
[https://github.com/apache/spark/pull/10960]
> Reimplement stat functions as declarative function
> --------------------------------------------------
>
> Key: SPARK-12913
> URL: https://issues.apache.org/jira/browse/SPARK-12913
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
> Fix For: 2.0.0
>
>
> As benchmarked and discussed here:
> https://github.com/apache/spark/pull/10786/files#r50038294.
> Benefits from codegen, the declarative aggregate function could be much
> faster than imperative one, we should re-implement all the builtin aggregate
> functions as declarative one.
> For skewness and kurtosis, we need to benchmark it to make sure that the
> declarative one is actually faster than imperative one.
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