Jackie-Jiang commented on issue #4230: NULL value support for all data types
URL: 
https://github.com/apache/incubator-pinot/issues/4230#issuecomment-497189356
 
 
   Just adding predicate x != NULL is not good enough. We need to plug-in the 
NULL handling logic into all predicates as well. E.g. `x = NULL`, `x != n` 
(other than NULL), `x NOT IN (a, b, c)` (other than NULL) should return true, 
all other predicates should return false.

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