[jira] [Resolved] (SPARK-21717) Decouple the generated codes of consuming rows in operators under whole-stage codegen

["Wenchen Fan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21717?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-21717.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0

Issue resolved by pull request 18931
[https://github.com/apache/spark/pull/18931]

> Decouple the generated codes of consuming rows in operators under whole-stage codegen
> -------------------------------------------------------------------------------------
>
>                 Key: SPARK-21717
>                 URL: https://issues.apache.org/jira/browse/SPARK-21717
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Liang-Chi Hsieh
>            Assignee: Liang-Chi Hsieh
>            Priority: Critical
>             Fix For: 2.3.0
>
>
> It has been observed in SPARK-21603 that whole-stage codegen suffers performance degradtion, if generated functions are too long to be optimized by JIT.
> We basically produce a single function to incorporate generated codes from all physical operators in whole-stage. Thus, it is possibly to grow the size of generated function over a threshold that we can't have JIT optimization for it anymore.
> This ticket is trying to decouple the logic of consuming rows in physical operators to avoid a giant function processing rows.



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