I was wondering if it’s possible to query documents by existence of 1+ fields (preferably tag fields). Something like this:
FT.SEARCH myIndex @tagfield1 @tagfield2 -(@tagfield3)
which is to retrieve documents that has any (non-empty) values in “tagfield1” and “tagfield2” AND does not contain any (non-empty) values in “tagfield3” field. Is this possible? Or, do I need to write my own expander?