MaxGekk commented on issue #25998: [SPARK-29328][SQL] Fix calculation of mean 
seconds per month
URL: https://github.com/apache/spark/pull/25998#issuecomment-538783655
 
 
   > ... mostly on the grounds that it will almost never matter.
   
   If we would have this, we could calculate duration of any interval, and make 
the `INTERVAL` type comparable as [PostgreSQL 
has](https://github.com/postgres/postgres/blob/master/src/test/regress/sql/interval.sql#L39-L55):
   ```sql
   maxim=# select interval '1 month 1 microsecond' > interval '1 month';
    ?column? 
   ----------
    t
   (1 row)
   ```
   I even don't speak about this PR https://github.com/apache/spark/pull/25981 
which is blocked by this somehow.

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