AngersZhuuuu opened a new pull request #33993:
URL: https://github.com/apache/spark/pull/33993
### What changes were proposed in this pull request?
For query
```
select array_distinct(array(cast('nan' as double), cast('nan' as double)))
```
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 fix this based on https://github.com/apache/spark/pull/33955
### 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
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