mayankshriv commented on issue #4230: NULL value support for all data types URL: https://github.com/apache/incubator-pinot/issues/4230#issuecomment-497112523 For 4: Is there a reason where users would not want to filter out NULL values for metrics? With default value of 0 for metrics, `sum` works. However, min/max/avg may give incorrect answers in presence of NULLs. And for specialized structures such as TDigest/HLL, the question becomes what value to store in the index such that the it is de-serializable into memory as well as result is not polluted due to presence of NULLs. Also +1 to building presence vector in segment generation phase.
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