waitingkuo commented on issue #5641:
URL:
https://github.com/apache/arrow-datafusion/issues/5641#issuecomment-1476359597
hi @alamb thank you for raising this, it looks great.
one thing i'm still struggleing is whether
`select date_bin('30 minutes', '1970-01-01T00:31:01+08:00')`;
should output
`1969-12-31T16:30:00`
or
`1970-01-01T00:30:00`
note that datafusion currently outputs `timestamp`
```bash
❯ select date_bin('30 minutes', timestamp '1970-01-01T00:31:01+08:00',
'1970-01-01');
+----------------------------------------------------------------------------------+
| datebin(Utf8("30
minutes"),Utf8("1970-01-01T00:31:01+08:00"),Utf8("1970-01-01")) |
+----------------------------------------------------------------------------------+
| 1969-12-31T16:30:00
|
+----------------------------------------------------------------------------------+
1 row in set. Query took 0.003 seconds.
```
while posgresql outputs `timestamptz` if either `source` or `origin` is
`timestamptz`
```willy=# select date_bin('30 minutes', '1970-01-01T00:31:01+08:00',
'1970-01-01');
date_bin
------------------------
1969-12-31 16:30:00+00
(1 row)
```
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