[jira] [Assigned] (SPARK-21870) Split codegen'd aggregation code into small functions for the HotSpot

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

     [ https://issues.apache.org/jira/browse/SPARK-21870?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan reassigned SPARK-21870:
-----------------------------------

    Assignee: Takeshi Yamamuro

> Split codegen'd aggregation code into small functions for the HotSpot
> ---------------------------------------------------------------------
>
>                 Key: SPARK-21870
>                 URL: https://issues.apache.org/jira/browse/SPARK-21870
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Takeshi Yamamuro
>            Assignee: Takeshi Yamamuro
>            Priority: Minor
>
> In SPARK-21603, we got performance regression if the HotSpot didn't compile too long functions (the limit is 80000 in bytecode size).
> I checked and I found the codegen of `HashAggregateExec` frequently goes over the limit, for example:
> {code}
> spark.range(10000000).selectExpr("id % 1024 AS a", "id AS b").write.saveAsTable("t")
> sql("SELECT a, KURTOSIS(b)FROM t GROUP BY a")
> {code}
> This query goes over the limit and the actual bytecode size is `12356`.
> So, it might be better to split the aggregation code into piecies.



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