lib/field_test/experiment.rb in field_test-0.5.2 vs lib/field_test/experiment.rb in field_test-0.5.3

@@ -111,13 +111,12 @@
         column =
           if FieldTest.legacy_participants
             :participant
           elsif adapter_name =~ /postg/i # postgres
             "(participant_type, participant_id)"
-          elsif adapter_name =~ /mysql/i
-            "participant_type, participant_id"
           else
-            # not perfect, but it'll do
+            # SQLite supports single column
+            # MySQL supports multiple columns, but none can be NULL
             "COALESCE(participant_type, '') || ':' || participant_id"
           end
 
         converted = events.merge(relation).where(field_test_events: {name: goal}).distinct.count(column)