alamb commented on issue #3166:
URL:
https://github.com/apache/arrow-datafusion/issues/3166#issuecomment-1215813515
@waitingkuo notes that postgres does:
```bash
willy=# select pg_typeof(SUM(time '00:00:00')), pg_typeof(AVg(time
'00:00:00'));
pg_typeof | pg_typeof
-----------+-----------
interval | interval
(1 row)
```
this make sense otherwise SUM(Time) is just quite strange
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