alamb commented on issue #781:
URL:
https://github.com/apache/arrow-datafusion/issues/781#issuecomment-887506950
BTW when grouping, according to postgres, null should be included:
```sql
alamb=# select * from test;
d1
-------
one
three
(3 rows)
alamb=# select d1, count(*) from test group by d1;
d1 | count
-------+-------
| 1
three | 1
one | 1
(3 rows)
```
(note the column for d1 = NULL)
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