Update ParseLiveQueryServer.js

Author: dblythy

src/LiveQuery/ParseLiveQueryServer.js

@@ -900,7 +900,9 @@ class ParseLiveQueryServer {
       };
       // Add selected fields, sessionToken and installationId for this subscription if necessary
       if (request.query.keys) {
-        subscriptionInfo.keys = Array.isArray(request.query.keys) ? request.query.keys : [request.query.keys];
+        subscriptionInfo.keys = Array.isArray(request.query.keys)
+          ? request.query.keys
+          : request.query.keys.split(',');
       }
       if (request.query.fields) {
         subscriptionInfo.keys = request.query.fields;