glasser commented on issue #5789: Add stringLast and stringFirst aggregators extension URL: https://github.com/apache/incubator-druid/pull/5789#issuecomment-470415828 I don't really understand the variety of slightly different entry points involved in the metric aggregation process, but it seems like if StringFirstAggregateCombiner used the same logic as `StringFirstAggregator.aggregate` where it allowed `selector.getObject()` to return either a String or a SerializablePairLongString, then whatever this issue actually is would be resolved.
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