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https://issues.apache.org/jira/browse/SPARK-20095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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song fengfei updated SPARK-20095:
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Priority: Major (was: Minor)
> A code bug in CodegenContext.withSubExprEliminationExprs
> --------------------------------------------------------
>
> Key: SPARK-20095
> URL: https://issues.apache.org/jira/browse/SPARK-20095
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: song fengfei
>
> In the function:CodegenContext.withSubExprEliminationExprs...{
> val oldsubExprEliminationExprs = subExprEliminationExprs
> subExprEliminationExprs.clear
> ...
> // Restore previous subExprEliminationExprs
> subExprEliminationExprs.clear
> oldsubExprEliminationExprs.foreach(subExprEliminationExprs += _)
> }
> it seems that the oldsubExprEliminationExprs and subExprEliminationExprs are
> the same instance,after the second subExprEliminationExprs.clear ,the
> oldsubExprEliminationExprs is also cleared,so,the previous
> subExprEliminationExprs in CodegenContext will not be Restored.
> Is it a bug?
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