mysql-connector: compact SQL queries

src/datasource-zabbix/zabbixDBConnector.js

@@ -66,6 +66,7 @@ function ZabbixDBConnectorFactory(datasourceSrv, backendSrv) {
             GROUP BY time_sec DIV ${intervalSec}, metric
         `;
 
+        query = compactSQLQuery(query);
         return this.invokeSQLQuery(query);
       });
 
@@ -133,3 +134,7 @@ function convertHistory(time_series, items, addHostName) {
 
   return _.sortBy(grafanaSeries, 'target');
 }
+
+function compactSQLQuery(query) {
+  return query.replace(/\s+/g, ' ');
+}