adriangb commented on PR #19303:
URL: https://github.com/apache/datafusion/pull/19303#issuecomment-3649583147
@theirix this now works by always casting exponents to float, this is the
same behavior as Postgres:
```sql
select pg_typeof(pow(2, 3));
pg_typeof
------------------
double precision
(1 row)
```
Here is the full table of behavior:
```
| Base | Exponent | DataFusion | PostgreSQL |
|---------|----------|------------|--------------------|
| int | int | Float64 | double precision ✓ |
| int | float | Float64 | double precision ✓ |
| decimal | int | Decimal128 | numeric ✓ |
| decimal | float | Decimal128 | numeric ✓ |
```
The only difference I can see is that `pow(2.5, 2)` returns `numeric` in
postgres and `float64` in datafusion, but this is because `select
pg_typeof(2.5)` is `numeric`.
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