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https://issues.apache.org/jira/browse/SPARK-26546?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-26546.
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Resolution: Fixed
Fix Version/s: 3.0.0
Issue resolved by pull request 23462
[https://github.com/apache/spark/pull/23462]
> Caching of DateTimeFormatter
> ----------------------------
>
> Key: SPARK-26546
> URL: https://issues.apache.org/jira/browse/SPARK-26546
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Maxim Gekk
> Assignee: Maxim Gekk
> Priority: Minor
> Fix For: 3.0.0
>
>
> Currently, instances of java.time.format.DateTimeFormatter are built each
> time when new instance of Iso8601DateFormatter or Iso8601TimestampFormatter
> is created which is time consuming operation because it should parse the
> timestamp/date patterns. It could be useful to create a cache with key =
> (pattern, locale) and value = instance of java.time.format.DateTimeFormatter.
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