[GitHub] [spark] MaxGekk edited a comment on issue #24185: [SPARK-27252][SQL] Make current_date() independent from time zones

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MaxGekk edited a comment on issue #24185: [SPARK-27252][SQL] Make current_date() independent from time zones
URL: https://github.com/apache/spark/pull/24185#issuecomment-477755928
 
 
   Just to make consequences of the changes clear:
   1. `current_date()` will **always** produce current date as a value of `DateType` in the `UTC` time zone.
   2. All available conversions of `DateType` to `StringType` is time zone independent in Spark at the moment. See the comment: https://github.com/apache/spark/pull/24181#discussion_r269092290 . Produced strings are **always** textual representation of dates in the UTC time zone.
   
   To take the current date in local time zone (defined by `spark.sql.session.timeZone`), `DATE` column can be casted to `TIMESTAMP` column, and former one can be converted `STRING` column. This works because `TimestampType` to `StringType` is time zone dependent.  For example:
   ```sql
   select date_format(cast(current_date as TIMESTAMP), 'yyyy-MM-dd')
   ```
   or with implicit conversion:
   ```sql
   select date_format(current_date, 'yyyy-MM-dd')
   ```

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