es1220 opened a new pull request #7504: Fix aggregatorFactory meta merge exception URL: https://github.com/apache/incubator-druid/pull/7504 Fix HllSketch Metadata merge Exception A `segmentMetadata` query with` merge = true` raises an exception because it does not implement the `getMergingFactory` method. ```json { "error": "Unknown exception", "errorMessage": "[io.druid.query.aggregation.datasketches.hll.HllSketchMergeAggregatorFactory] does not implement getMergingFactory(..)", "errorClass": "io.druid.java.util.common.UOE", "host": null } ```
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