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https://issues.apache.org/jira/browse/SPARK-27832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun closed SPARK-27832.
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> Don't decompress and create column batch when the task is completed
> -------------------------------------------------------------------
>
> Key: SPARK-27832
> URL: https://issues.apache.org/jira/browse/SPARK-27832
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Liang-Chi Hsieh
> Priority: Major
>
> Cached relation decompresses and creates column batch when accessing cache.
> It's possible that a thread doesn't stop immediately reading cached relation
> after the task is completed. Due to race condition, cached relation might
> still decompresses and creates new and unnecessary batch. At the moment, the
> returned batch is also immediately closed. At the reader side, it can cause
> null exception, and we probably need to hide such exception.
> We don't need to create the batch if the task is completed.
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