[jira] [Resolved] (SPARK-32006) Create date/timestamp formatters once before collect in `hiveResultString()`

["Wenchen Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-32006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-32006.
---------------------------------
    Fix Version/s: 3.1.0
       Resolution: Fixed

Issue resolved by pull request 28842
[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
>            Assignee: Maxim Gekk
>            Priority: Major
>             Fix For: 3.1.0
>
>
> 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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