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-494596106 @kishoreg I understand that NULL value is per column, but for example: SELECT SUM(A), SUM(B) FROM table, for the same document, column A might have NULL value while column B does not. We cannot apply an extra filter in such case. Can you describe why this will be backward incompatible (forward incompatible maybe as we don't have NULL support yet)?
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