[jira] [Commented] (SPARK-36497) Support Interval add/subtract NULL

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

    [ https://issues.apache.org/jira/browse/SPARK-36497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17398117#comment-17398117 ] 

Apache Spark commented on SPARK-36497:
--------------------------------------

User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/33727

> Support Interval add/subtract NULL
> ----------------------------------
>
>                 Key: SPARK-36497
>                 URL: https://issues.apache.org/jira/browse/SPARK-36497
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: Gengliang Wang
>            Assignee: Gengliang Wang
>            Priority: Major
>
> Currently, `null + interval`  will become `cast(cast(null as timestamp) + interval) as null`. This is a unexpected behavior and the result should not be of null type.
> This weird behavior applies to `null - interval`, `interval + null`, `interval - null` as well.
> To change it, I propose to cast the null as the same data type of the other element in the add/subtract:
> ```
> null + interval => cast(null as interval) + interval
> null - interval => cast(null as interval) - interval
> interval + null=> interval + cast(null as interval)
> interval - null => interval - cast(null as interval)
> ```



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