[GitHub] [incubator-druid] clintropolis opened a new pull request #9076: variance aggregator support for double columns

[GitBox <gi...@apache.org>]

clintropolis opened a new pull request #9076: variance aggregator support for double columns
URL: https://github.com/apache/incubator-druid/pull/9076
 
 
   ### Description
   Adds direct support to the variance aggregator for double typed columns instead of treating them as floats, also fallback detection of type from column capabilities rather than defaulting immediately to float.
   
   <hr>
   
   This PR has:
   - [x] been self-reviewed.
      - [ ] using the [concurrency checklist](https://github.com/apache/incubator-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.
   - [x] added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
   - [ ] 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.
   - [ ] added integration tests.
   - [ ] been tested in a test Druid cluster.
   

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