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https://issues.apache.org/jira/browse/SPARK-16713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15393863#comment-15393863
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Apache Spark commented on SPARK-16713:
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User 'lw-lin' has created a pull request for this issue:
https://github.com/apache/spark/pull/14370
> Limit codegen method size to 8KB
> --------------------------------
>
> Key: SPARK-16713
> URL: https://issues.apache.org/jira/browse/SPARK-16713
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core, SQL
> Affects Versions: 2.0.0
> Reporter: Qifan Pu
>
> Ideally, we would wish codegen methods to be less than 8KB for bytecode size.
> Beyond 8K JIT won't compile and can cause performance degradation. We have
> seen this for queries with wide schema (30+ fields), where
> agg_doAggregateWithKeys() can be more than 8K. This is also a major reason
> for performance regression when we enable fash aggregate hashmap (such as
> using VectorizedHashMapGenerator.scala).
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