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https://issues.apache.org/jira/browse/SPARK-32006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17137852#comment-17137852
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Apache Spark commented on SPARK-32006:
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User 'MaxGekk' has created a pull request for this issue:
https://github.com/apache/spark/pull/28842
> Create date/timestamp formatters once before collect in `hiveResultString()`
> ----------------------------------------------------------------------------
>
> Key: SPARK-32006
> URL: https://issues.apache.org/jira/browse/SPARK-32006
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.1, 3.1.0
> Reporter: Maxim Gekk
> Priority: Major
>
> Spark 2.4 re-uses one instance of SimpleDateFormat while formatting
> timestamps in toHiveString. Currently, toHiveString() creates
> timestampFormatter per each value. Even w/ caching, it causes additional
> overhead comparing to Spark 2.4. The ticket aims to create an instance of
> TimestampFormatter before collect in hiveResultString()
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