Expressions are considered as columns. But what if it was possible to create our own filters as expressions, it means you can’t select it (no checkbox) but you can use it as filter.
So when you drag and drop it in the filter area, no comparison item is proposed, it’s just the filter and nothing else.
This would enable to force our own filters. For example when easymorph uses oracle dates, it casts it into timestamp which is not good. So with filter expression we could do MY_DATE = TO_DATE(…) without the timestamp cast and without any more comparison to do.