Akshat-Jain opened a new pull request, #17036:
URL: https://github.com/apache/druid/pull/17036
### Description
This PR aims to reject MVDs when used as `partition by` columns during
window function processing for MSQ engine.
Prior to this change, a MSQ query like the following was failing with
ClassCastException:
```sql
select cityName, countryName, array_to_mv(array[1,length(cityName)]),
row_number() over (partition by array_to_mv(array[1,length(cityName)])
order by countryName, cityName)
from wikipedia
where countryName in ('Austria', 'Republic of Korea') and cityName is not
null
order by 1, 2, 3
```
This is a follow-up on https://github.com/apache/druid/pull/17002, where a
similar thing was done for sql-native engine.
<hr>
This PR has:
- [x] been self-reviewed.
- [ ] added documentation for new or modified features or behaviors.
- [ ] a release note entry in the PR description.
- [ ] 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/dev/license.md)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [x] 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.
- [ ] been tested in a test Druid cluster.
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