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