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https://issues.apache.org/jira/browse/SPARK-14577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15238323#comment-15238323
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Dongjoon Hyun commented on SPARK-14577:
---------------------------------------

In the current Spark architecture, `sql/core` module is designed to depend on 
`catalyst` module, and `catalyst` module does not access `SQLConf` of 
`sql/core`. What this issue needs is using configuration without changing any 
architectural design, isn't it?

> spark.sql.codegen.maxCaseBranches config option
> -----------------------------------------------
>
>                 Key: SPARK-14577
>                 URL: https://issues.apache.org/jira/browse/SPARK-14577
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Reynold Xin
>
> We currently disable codegen for CaseWhen if the number of branches is 
> greater than 20 (in CaseWhen.MAX_NUM_CASES_FOR_CODEGEN). It would be better 
> if this value is a non-public config defined in SQLConf.



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