server/AyaNova/DataList/DataListSqlFilterCriteriaBuilder.cs

@@ -1602,6 +1602,7 @@ namespace AyaNova.DataList
                         {
                             //Build tags filter fragment
                             //https://www.postgresql.org/docs/current/functions-array.html
+                            //https://www.postgresql.org/docs/9.1/functions-array.html
 
                             /*
                             For these reasons, am requesting the ability to filter on the Tag column to include:
@@ -1633,8 +1634,14 @@ namespace AyaNova.DataList
                             Not equal: Not EXACTLY Equal (aside from order) All terms in search term array NOT present in All terms in db record. IOW if db record has all search terms but also one more tag then it's NOT equal, Order doesn't matter
                             NO value: Empty tag array in db record
                             Has value: Non empty tag array in db record
+                            
                             Contains: All terms in search query present in db record, db record may have other tags but that's ok as long as it has the search term ones (order insensitive)
+                                db record Tags contains search tags (and maybe also other tags)
+                                WHERE ARRAY['red','green'::varchar(255)] <@ tags 
+
                             Not contains: All terms in search query *NOT* present in db record, don't care what else is in db record as long as it's not the search terms (order insensitive)
+                                db record Tags DOES NOT contain search tags 
+                                WHERE NOT ARRAY['red','green'::varchar(255)] <@ tags
 
                             This method and choices ensures users don't need to make a separate row for each one they can just treat the entire tag collection like they treat a single word match in a text field
                             */