a2l007 opened a new pull request #8368: Reset union in AggregateCombiner URL: https://github.com/apache/incubator-druid/pull/8368 Fixes #7741 This PR fixes an issue where the `AggregateCombiner.reset()` within `SketchAggregatorFactory`does not clear the Sketch union object. As a result, during index merging if the sketches are empty for a set of rows to be combined, the combined sketch value from the previous set of merged rows would be reused in the current combine thereby corrupting the data. This PR has: - [x] been self-reviewed. - [x] added unit tests or modified existing tests to cover new code paths. - [x] been tested in a test Druid cluster. @leventov Please review.
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