[jira] [Assigned] (SPARK-27252) Make current_date() independent from time zones

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

     [ https://issues.apache.org/jira/browse/SPARK-27252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan reassigned SPARK-27252:
-----------------------------------

    Assignee: Maxim Gekk

> Make current_date() independent from time zones
> -----------------------------------------------
>
>                 Key: SPARK-27252
>                 URL: https://issues.apache.org/jira/browse/SPARK-27252
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: Maxim Gekk
>            Assignee: Maxim Gekk
>            Priority: Minor
>
> The CurrentDate expression produces a result of DateType which is by definition number of days since epoch (in UTC time zone). Current implementation shifts the number of days according to session time zone `spark.sql.session.timeZone`. Result of shifting cannot be considered as number of days since epoch in UTC time zone, and cannot have type `DateType`. There are many reasons that makes the result invalid. For example:
> # zone offset depends on an instant in UTC timezone, and zone offset of `spark.sql.session.timeZone` in shifted date may have different value.
> # Result of shifting cannot be considered as number of days since epoch anymore.
> The ticket aims to make `current_date` independent from time zone, and to return the current date in UTC time zone.



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