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Posted to issues@spark.apache.org by "Davies Liu (JIRA)" <ji...@apache.org> on 2016/02/12 01:40:18 UTC

[jira] [Commented] (SPARK-12949) Support common expression elimination

    [ https://issues.apache.org/jira/browse/SPARK-12949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143787#comment-15143787 ] 

Davies Liu commented on SPARK-12949:
------------------------------------

After some prototype, enable common expression elimination could have 10+% improvement on stddev, but 50% regression on Kurtosis, have not figure why, maybe JIT can already eliminate the common expressions (given the fact that Kurtosis is only 20% slower than stddev)? If yes, we may not want to do this. 

> Support common expression elimination
> -------------------------------------
>
>                 Key: SPARK-12949
>                 URL: https://issues.apache.org/jira/browse/SPARK-12949
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Davies Liu
>




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