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https://issues.apache.org/jira/browse/SPARK-22520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16252561#comment-16252561
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Apache Spark commented on SPARK-22520:
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User 'mgaido91' has created a pull request for this issue:
https://github.com/apache/spark/pull/19752
> Support code generation also for complex CASE WHEN
> --------------------------------------------------
>
> Key: SPARK-22520
> URL: https://issues.apache.org/jira/browse/SPARK-22520
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Marco Gaido
> Priority: Minor
>
> Code generation is disabled for CaseWhen when the number of branches is
> higher than {{spark.sql.codegen.maxCaseBranches}} (which defaults to 20).
> This was done in SPARK-13242 to prevent the well known 64KB method limit
> exception.
> This tickets proposes to support code generation also in those cases (without
> causing exceptions of course). As a side effect, we could get rid of the
> {{spark.sql.codegen.maxCaseBranches}} configuration.
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