yurmix commented on issue #6519: Lookups should be able to return list of values URL: https://github.com/apache/incubator-druid/issues/6519#issuecomment-440007055 Another question I'm trying to answer is how does GroupBy determines that a dimension is of multi-value capability. So far I've seen that `GroupByQueryEngineV2` checks `columnCapabilities.hasMultipleValues()` in order to decide wether to route through `aggregateMultiValueDims` or `aggregateSingleValueDims`, but I haven't found where is that property being decided for Lookups.
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