abhishekagarwal87 opened a new pull request #10304:
URL: https://github.com/apache/druid/pull/10304
### Description
This PR adds vectorization support for Aggregators in the `druid-histogram`
extension. While these changes are unlikely to result in the usage of SIMD
instructions, they can still help gain performance in two ways I can think of
- Being more cache-friendly and less number of function calls
- Enable vectorization for the whole query when one of the participating
aggregator is `Approximate Histogram` assuming other aggregators in query
support vectorization.
I am yet to add more tests hence the PR is in draft stage.
<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.
- [ ] 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.
- [ ] been tested in a test Druid cluster.
<!-- Check the items by putting "x" in the brackets for the done things. Not
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<hr>
##### Key changed/added classes in this PR
* `MyFoo`
* `OurBar`
* `TheirBaz`
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