Fixed submissions status in AWS overview.

It seems that the union query is not guaranteed to return results in order.

cms/server/admin/server.py

@@ -7,6 +7,7 @@
 # Copyright © 2012-2016 Luca Wehrstedt <[email protected]>
 # Copyright © 2014 Artem Iglikov <[email protected]>
 # Copyright © 2014 Fabian Gundlach <[email protected]>
+# Copyright © 2020 Vytis Banaitis <[email protected]>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
@@ -176,13 +177,8 @@ def submissions_status(contest_id):
                     .filter(Task.contest_id == contest_id)
             queries['total'] = total_query
 
-            stats = {}
-            keys = list(queries.keys())
-            results = queries[keys[0]].union_all(
-                *(queries[key] for key in keys[1:])).all()
+            stats = {key: queries[key].one()[0] for key, query in queries.items()}
 
-        for i, k in enumerate(keys):
-            stats[k] = results[i][0]
         stats['compiling'] += 2 * stats['total'] - sum(stats.values())
 
         return stats