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

2016-05-24 Thread Davies Liu (JIRA) 

[ 
https://issues.apache.org/jira/browse/SPARK-12949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15298537#comment-15298537
 ] 

Davies Liu commented on SPARK-12949:


Common subexpress elimination in Aggregate are supported by SPARK-14951, so 
close 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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[jira] [Commented] (SPARK-12949) Support common expression elimination

2016-02-11 Thread Davies Liu (JIRA) 

[ 
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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