siddharthteotia opened a new pull request #5075: Fix bug in DISTINCT for queries that return empty response URL: https://github.com/apache/incubator-pinot/pull/5075 The DistinctTable which is the IntermediateResult type of DistinctAggregationFunction was null in such cases. Since we use the same object to serialize the result of the function as a single object (to keep consistency with how other aggregation function results are sent to the broker), the broker reduce service was throwing exception upon seeing the DistinctTable as null. The fix is to send an empty table.
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