MaxGekk commented on issue #25981: [SPARK-28420][SQL] Support the `INTERVAL` 
type in `date_part()`
URL: https://github.com/apache/spark/pull/25981#issuecomment-540061166
 
 
   > However seconds works differently, as it very much is trying to return the 
seconds + ms + us in seconds. So it returns a real type. But why is it 
different?
   
   I can only say that I followed PostgreSQL implementation. Why it is 
different in PostgreSQL, I cannot say because there are no comments or 
discussion there: 
https://github.com/postgres/postgres/commit/41f1f5b76ad8e177a2b19116cbf41384f93f3851#diff-fc8c71b106f6bc31729543d63b5f7a8fR2057

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