### What changes were proposed in this pull request?
For query
```
select array_union(array(cast('nan' as double), cast('nan' as double)), array())
```
This returns [NaN, NaN], but it should return [NaN].
This issue is caused by `OpenHashSet` can't handle `Double.NaN` and `Float.NaN` too.
In this pr we add a wrap for OpenHashSet that can handle `null`, `Double.NaN`, `Float.NaN` together
### Why are the changes needed?
Fix bug
### Does this PR introduce _any_ user-facing change?
ArrayUnion won't show duplicated `NaN` value
### How was this patch tested?
Added UT
Closes#33955 from AngersZhuuuu/SPARK-36702-WrapOpenHashSet.
Lead-authored-by: Angerszhuuuu <angers.zhu@gmail.com>
Co-authored-by: AngersZhuuuu <angers.zhu@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
(cherry picked from commit f71f37755d)
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
a472612eb8