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https://issues.apache.org/jira/browse/SPARK-22226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16197036#comment-16197036
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Marco Gaido commented on SPARK-22226:
-------------------------------------
[~srowen] I know that there are many ticket for this, but I wanted to submit a
PR to solve this specific issue I mentioned in the description. This won't
solve completely the error above (for datasets with 20.000 of columns for
instance), but it will allow to support a larger number of columns than now.
Thus I created this JIRA for that PR. If this is not the right approach, may
you please tell me what I should do?
Thanks.
> Code generation fails for dataframes with 10000 columns
> -------------------------------------------------------
>
> Key: SPARK-22226
> URL: https://issues.apache.org/jira/browse/SPARK-22226
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Marco Gaido
>
> Code generation for very wide datasets can fail because of the Constant Pool
> limit reached.
> This can be caused by many reasons. One of them is that we are currently
> splitting the definition of the generated methods among several
> {{NestedClass}} but all these methods are called in the main class. Since we
> have entries added to the constant pool for each method invocation, this is
> limiting the number of rows and is leading for very wide dataset to:
> {noformat}
> org.codehaus.janino.JaninoRuntimeException: Constant pool for class
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$SpecificMutableProjection
> has grown past JVM limit of 0xFFFF
> {noformat}
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