waitingkuo commented on issue #200:
URL:
https://github.com/apache/arrow-datafusion/issues/200#issuecomment-1215810158
@alamb i just tested postgrseql, looks like SUM and AVG cast Time to
Interval and then SUM / AVG them
```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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