kaijianding opened a new pull request #10899:
URL: https://github.com/apache/druid/pull/10899
### Description
for a sql like this
```sql
select count(1) as totalData
from (
select count(distinct unique_user_id) as uv
from a_table
group by city_name
order by uv
) t
```
unique_user_id is hyperUnique metric.
java.lang.ClassCastException is thrown as
> java.lang.Long cannot be cast to java.lang.Double
The reason is that `count(distinct unique_user_id)` is Long in row
signature, but the comparator in `HyperUniqueFinalizingPostAggregator` is Double
<hr>
This PR has:
- [x] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [ ] added documentation for new or modified features or behaviors.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/licenses.yaml)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [ ] added integration tests.
- [x] been tested in a test Druid cluster.
<hr>
##### Key changed/added classes in this PR
* `HyperUniqueFinalizingPostAggregator`
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