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https://issues.apache.org/jira/browse/SPARK-13185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15133771#comment-15133771
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Apache Spark commented on SPARK-13185:
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User 'carsonwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/11090
> Improve the performance of DateTimeUtils by reusing TimeZone and Calendar
> objects
> ---------------------------------------------------------------------------------
>
> Key: SPARK-13185
> URL: https://issues.apache.org/jira/browse/SPARK-13185
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Carson Wang
> Priority: Minor
>
> It is expensive to create java TimeZone and Calendar objects in each method
> of DateTimeUtils. We can reuse the objects to improve the performance. In one
> of my Sql queries which calls StringToDate many times, the duration of the
> stage improved from 1.6 minutes to 1.2 minutes.
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