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Posted to issues@spark.apache.org by "Davies Liu (JIRA)" <ji...@apache.org> on 2016/01/29 19:16:39 UTC

[jira] [Assigned] (SPARK-12913) Reimplement stat functions as declarative function

     [ https://issues.apache.org/jira/browse/SPARK-12913?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davies Liu reassigned SPARK-12913:
----------------------------------

    Assignee: Davies Liu

> 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
>
> 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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