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https://issues.apache.org/jira/browse/SPARK-14593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15238703#comment-15238703
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Apache Spark commented on SPARK-14593:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/12351
> Make currentVars work with splitExpressions to enable whole stage codegen for
> large input columns
> -------------------------------------------------------------------------------------------------
>
> Key: SPARK-14593
> URL: https://issues.apache.org/jira/browse/SPARK-14593
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Liang-Chi Hsieh
>
> We disable whole stage codegen if the input column number are too large. If
> we can make CodeGenContext.currentVars work with
> CodeGenContext.splitExpressions. We can enable whole stage codegen for large
> input columns.
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