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https://issues.apache.org/jira/browse/SPARK-24457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16504431#comment-16504431
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Apache Spark commented on SPARK-24457:
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User 'ssonker' has created a pull request for this issue:
https://github.com/apache/spark/pull/21505
> Performance improvement while converting stringToTimestamp in DateTimeUtils
> ---------------------------------------------------------------------------
>
> Key: SPARK-24457
> URL: https://issues.apache.org/jira/browse/SPARK-24457
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Sharad Sonker
> Priority: Major
>
> stringToTimestamp in DateTimeUtils creates Calendar instance for each input
> row even if the input timezone is same. This can be improved by caching the
> calendar instance for each input timezone.
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