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https://issues.apache.org/jira/browse/SPARK-17301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin resolved SPARK-17301.
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Resolution: Fixed
Fix Version/s: 2.1.0
2.0.1
> Remove unused classTag field from AtomicType base class
> -------------------------------------------------------
>
> Key: SPARK-17301
> URL: https://issues.apache.org/jira/browse/SPARK-17301
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Priority: Minor
> Fix For: 2.0.1, 2.1.0
>
>
> There's an unused {{classTag}} {{val}} in the {{AtomicType}} base class which
> is causing unnecessary slowness in deserialization because it needs to grab
> ScalaReflectionLock and create a new runtime reflection mirror. Removing this
> unused code gives a small but measurable performance boost in SQL task
> deserialization.
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