comphead opened a new issue, #10688:
URL: https://github.com/apache/datafusion/issues/10688
there is some issue with UNION ALL and type derivation
```
> select avg(a) from (select -128.2::float a union all select 32768.3 union
all select 27.3);
+--------------------+
| AVG(a) |
+--------------------+
| 10889.133334350587 |
+--------------------+
1 row(s) fetched.
Elapsed 0.011 seconds.
> select avg(a) from (select -128.2::float a union all select 32768.3::float
union all select 27.3::float);
+-------------------+
| AVG(a) |
+-------------------+
| 10889.13359451294 |
+-------------------+
1 row(s) fetched.
Elapsed 0.011 seconds.
```
I expect those numbers to be the same. And that what duck db does
_Originally posted by @comphead in
https://github.com/apache/datafusion/pull/10634#pullrequestreview-2081161394_
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