Null safe join works wrong with NaN values

[comphead]

Describe the bug
The DF and PG null safe join behavior is not consistent when working with NaN values

To Reproduce
PG

select * from (select 3 a, 'nan'::float b) x where b is not distinct from 'nan'::float
a |	b
------
3 |	

DF

❯ select * from (select 3 a, 'nan'::float b) x where b is not distinct from 'nan'::float;
0 rows in set. Query took 0.001 seconds.

Expected behavior
Should work the same as PG

Additional context
Add any other context about the problem here.

[comphead]

cc @sunchao