[GitHub] [incubator-druid] jihoonson commented on issue #8922: ArrayIndexOutOfBoundsException on historical in class GroupByMergingQueryRunnerV2 when grouping on high-cardinality dimension

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jihoonson commented on issue #8922: ArrayIndexOutOfBoundsException on historical in class GroupByMergingQueryRunnerV2 when grouping on high-cardinality dimension
URL: https://github.com/apache/incubator-druid/issues/8922#issuecomment-557243853
 
 
   Hi @sascha-coenen, groupBy v2 supports [array-based aggregation and hash-based aggregation](https://druid.apache.org/docs/latest/querying/groupbyquery.html#differences-between-v1-and-v2). I'm wondering if this error relates to something else besides too high cardinality. Would you please try the same query with `forceHashAggregation = true` in your query context?

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