https://github.com/druid-io/druid/blob/b3976050ad45b02bf84c17923e3f8f430a02ca88/processing/src/main/java/io/druid/segment/StringDimensionIndexer.java#L673-L690 @nishantmonu51 is this on purpose that `NullHandling.nullToEmptyIfNeeded()` is not applied on line 674?