[jira] [Commented] (SPARK-8199) date/time function: date_format

["Adrian Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-8199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14578541#comment-14578541 ] 

Adrian Wang commented on SPARK-8199:
------------------------------------

I'll deal with this.

> date/time function: date_format
> -------------------------------
>
>                 Key: SPARK-8199
>                 URL: https://issues.apache.org/jira/browse/SPARK-8199
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Reynold Xin
>
> date_format(date/timestamp/string ts, string fmt): string
> Converts a date/timestamp/string to a value of string in the format specified by the date format fmt (as of Hive 1.2.0). Supported formats are Java SimpleDateFormat formats – https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html. The second argument fmt should be constant. Example: date_format('2015-04-08', 'y') = '2015'.
> date_format can be used to implement other UDFs, e.g.:
> dayname(date) is date_format(date, 'EEEE')
> dayofyear(date) is date_format(date, 'D')



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