KazydubB commented on issue #1840: DRILL-7343: Add User-Agent UDFs to Drill URL: https://github.com/apache/drill/pull/1840#issuecomment-527940960 @cgivre I agree that having two functions for `OPTIONAL` and `REQUIRED` cases is not the best experience, but returning an empty list on `NULL` is not enough, because there may be functions that will need to return a `MAP` for example. So, there's a need to provide `NullHandling` for `NULL` input for other cases too (`EMPTY_LIST_IF_NULL`, `EMPTY_MAP_IF_NULL` etc.).
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