Jackie-Jiang commented on issue #4230: NULL value support for all data types URL: https://github.com/apache/incubator-pinot/issues/4230#issuecomment-497436948 I would prefer always assume all columns are nullable unless users explicitly mark it nonNull (which is very rare, but might be useful for boolean type. A default null value is required). For the existing segment, leave it as is. For default column, generate empty presence vector if the column is nullable. For query execution, we should automatically filter out NULLs as needed, and also support explicit filters on NULLs.
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