fix activity timeline using TimelineSingleQuery

src/Bundle/ChillMainBundle/Timeline/TimelineBuilder.php

@@ -201,10 +201,13 @@ class TimelineBuilder implements ContainerAwareInterface
     /**
      * return the SQL SELECT query as a string,
      *
-     * @return string
+     * @return array: first parameter is the sql string, second an array with parameters
      */
-    private function buildSelectQuery(array $data): array
+    private function buildSelectQuery($data): array
     {
+        return [$data->buildSql(), $data->getParameters()];
+
+        // dead code
         $parameters = [];
 
         $sql = sprintf(