Jackie-Jiang commented on issue #4214: Support default BYTES (zero-length byte array) in aggregation function and aggregator URL: https://github.com/apache/incubator-pinot/pull/4214#issuecomment-494578632 @kishoreg It cannot be done in filter phase because for each document, there is no guarantee that all metrics are null. We can filter them out in data fetching phase though. I think we need to add a new index type or reserve some dictId for null. Will create the issue.
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