pranavbhole opened a new pull request, #15434:
URL: https://github.com/apache/druid/pull/15434
### Description
In case of MVDs, we need to decide if need to aggregate multiple values or
pick up first one from the list. This PR enables aggregateMultipleValues
optional flag in all StringAnyAggregators. Also exposed the flag in ANY_VALUE
sql function.
#### Fixed the bug ...
StringAnyVectorAggregator has some bug, in case of mvds, it always used to
pick up first value, and it was inconsistent behavior with other StringAny
Aggregator. aggregateMultipleValues is set to true by default. If user need
first encountered values from mvd fields then aggregateMultipleValues can be
set to false.
#### Release note
Adding aggregateMultipleValues optional flag in ANY_VALUE and StringAny
aggregators.
<hr>
This PR has:
- [ ] 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.
- [ ] 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.
- [ ] 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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