[jira] [Assigned] (SPARK-20771) Usability issues with weekofyear()

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-20771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-20771:
------------------------------------

    Assignee: Apache Spark

> Usability issues with weekofyear()
> ----------------------------------
>
>                 Key: SPARK-20771
>                 URL: https://issues.apache.org/jira/browse/SPARK-20771
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Xiangrui Meng
>            Assignee: Apache Spark
>            Priority: Minor
>
> The weekofyear() implementation follows HIVE / ISO 8601 week number. However it is not useful because it doesn't return the year of the week start. For example,
> weekofyear("2017-01-01") returns 52
> Anyone using this with groupBy('week) might do the aggregation or ordering wrong. A better implementation should return the year number of the week as well.
> MySQL's yearweek() is much better in this sense: https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_yearweek.
> Maybe we should implement that in Spark.



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