MaxGekk commented on issue #25981: [SPARK-28420][SQL] Support the `INTERVAL` 
type in `date_part()`
URL: https://github.com/apache/spark/pull/25981#issuecomment-539587062
 
 
   > It isn't the seconds part of the interval, nor the whole interval, but 
three parts of the interval.
   
   Right, the function behaves inconsistently for different components but the 
same behavior we see for timestamps (this has been already merged to the 
master):
   ```sql
   spark-sql> select date_part('seconds', timestamp'2019-10-08 
05:00:30.001001');
   30.001001
    ```
   So, its behavior is consistent across types.
   
   In general, when we port any functionality from PostgreSQL, should we 
preserve absolutely the same semantic or you think we can define it differently?

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