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https://issues.apache.org/jira/browse/SPARK-7956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14565445#comment-14565445
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Apache Spark commented on SPARK-7956:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/6479
> Use Janino to compile SQL expression
> ------------------------------------
>
> Key: SPARK-7956
> URL: https://issues.apache.org/jira/browse/SPARK-7956
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
>
> The overhead of current implementation of codegen is to high (50ms - 500ms),
> which blocks us from turning it on by default.
> We should try to investigate using Janino to compile the SQL expressions into
> JVM bytecode, which should be much faster to compile (about 10ms).
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