clintropolis opened a new pull request #7718: allow quantiles merge aggregator to also accept doubles URL: https://github.com/apache/incubator-druid/pull/7718 Fixes #7660. This PR just does the quicker fix, modifying the merge aggregator to allow it to operate on either `DoubleSketch` selectors or `Double` selectors. The added test triggers a failure of the form: ``` java.lang.ClassCastException: java.lang.Double cannot be cast to com.yahoo.sketches.quantiles.DoublesSketch ``` without the modification of this patch. While investigating this issue, I have been reviewing many of the complex value aggregators, which are not incredibly consistent with each other in terms of usage/construction, but all have very similar needs: being able to build complex values, and being able to merge complex values. Refactoring to try to find a common pattern feels out of scope of fixing this issue though, so I will be hopefully revisiting this in a follow-up proposal or PR.
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