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https://issues.apache.org/jira/browse/DRILL-4777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arina Ielchiieva reassigned DRILL-4777:
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Assignee: Arina Ielchiieva
> Fuse generated code to reduce code size and gain performance improvement
> ------------------------------------------------------------------------
>
> Key: DRILL-4777
> URL: https://issues.apache.org/jira/browse/DRILL-4777
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Chunhui Shi
> Assignee: Arina Ielchiieva
>
> Drill generates code for operators, compile the classes and load them on the
> fly of a query. However, in large query cases, the generated code will become
> hundreds KB or could be even bigger. We have seen multiple issues reported
> when generated code is too big either due to Java's size limit to one method
> or degrated performance of compiling or executing. Also when I looked at JIT
> optimization logs, there are many complaining about 'hot method too big'
> Some measures can be considered to reduce the code size, such as,
> 1) For now Drill embed function calls' code directly into generated code,
> this make one line function call to become 5-10 lines code in generated java
> classes. If we inject these functions as a private functions of the classes
> and directly call them in main function body, this could reduce code size
> while the cost of function call can be erased by JIT inline optimization.
> 2) Drill generate one variable for each column, if the column number became
> dozens to one hundred, the code will be redundant, we could consider using an
> array to store the value vectors and loop on top of it so the code size will
> be reduced even more.
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