Outer joins are in preview now but only to be supported at the modeling level, we need them supported at the dashboard level.
For customers who's clients require self service capabilities, and do ...
This seems similar to the item we raised previously.
https://community.sisense.com/idea/ideas/it-would-be-helpful-to-be-able-to-filter-by-comparing-2-objects-in-the-data-mode/28942