[jira] [Commented] (SPARK-28471) Formatting dates with negative years

["Maxim Gekk (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-28471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16889981#comment-16889981 ] 

Maxim Gekk commented on SPARK-28471:
------------------------------------

Here is my explanation of difference in years between Spark's and PostgreSQL outputs: [https://github.com/apache/spark/pull/25210#discussion_r305609274]

> Formatting dates with negative years
> ------------------------------------
>
>                 Key: SPARK-28471
>                 URL: https://issues.apache.org/jira/browse/SPARK-28471
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.4.3
>            Reporter: Maxim Gekk
>            Priority: Minor
>
> While converting dates with negative years to strings, Spark skips era sub-field by default. That's can confuse users since years from BC era are mirrored to current era. For example:
> {code}
> spark-sql> select make_date(-44, 3, 15);
> 0045-03-15
> {code}
> Even negative years are out of supported range by the DATE type, it would be nice to indicate the era for such dates.
> PostgreSQL outputs the era for such inputs:
> {code}
> # select make_date(-44, 3, 15);
>    make_date   
> ---------------
>  0044-03-15 BC
> (1 row)
> {code}



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