[jira] [Resolved] (SPARK-31176) Remove support for 'e'/'c' as datetime pattern charactar

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

     [ https://issues.apache.org/jira/browse/SPARK-31176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-31176.
---------------------------------
    Fix Version/s: 3.0.0
       Resolution: Fixed

Issue resolved by pull request 27939
[https://github.com/apache/spark/pull/27939]

> Remove support for 'e'/'c' as datetime pattern charactar 
> ---------------------------------------------------------
>
>                 Key: SPARK-31176
>                 URL: https://issues.apache.org/jira/browse/SPARK-31176
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Kent Yao
>            Assignee: Kent Yao
>            Priority: Major
>             Fix For: 3.0.0
>
>
> The meaning of 'u' was day number of week in SimpleDateFormat, it was changed to year in DateTimeFormatter.  So we keep the old meaning of 'u' by substituting 'u' to 'e' internally and use DateTimeFormatter to parse the pattern string. In DateTimeFormatter, the 'e' and 'c' also represents day-of-week, we should mark them as illegal pattern character to stay the same as before. 



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