jonahgao commented on issue #7458:
URL:
https://github.com/apache/arrow-datafusion/issues/7458#issuecomment-1702886615
> Expected -NaN results in the query outputs become NaN in my local tests.
What could be the reason for this? As far as I know, there is no -NaN in IEEE
754.
I also think so.
We can accept `+NAN` and `-NAN` as inputs just like PostgreSQL does.
However, when outputting, it should no longer differentiate them because `NAN`
represents an exception and the sign is no longer meaningful.
```
postgres=# select '+NAN'::float,'+NAN'::float;
float8 | float8
--------+--------
NaN | NaN
(1 row)
```
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