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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-20771) Usability issues with weekofyear()
Date Wed, 24 May 2017 00:30:04 GMT

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

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

    Assignee:     (was: 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
>            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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