Fix sortSeries() function, fixes #1274

pkg/datasource/functions.go

@@ -353,9 +353,8 @@ func applySortSeries(series []*timeseries.TimeSeriesData, params ...interface{})
 		return nil, errParsingFunctionParam(err)
 	}
 
-	aggFunc := timeseries.AggAvg
-	sorted := timeseries.SortBy(series, order, aggFunc)
-	return sorted, nil
+	timeseries.SortByName(series, order)
+	return series, nil
 }
 
 func applyTimeShiftPre(query *QueryModel, items []*zabbix.Item, params ...interface{}) error {

pkg/timeseries/sort.go

@@ -50,3 +50,15 @@ func SortByItem(series []*TimeSeriesData) []*TimeSeriesData {
 
 	return series
 }
+
+func SortByName(series []*TimeSeriesData, order string) []*TimeSeriesData {
+	sort.Slice(series, func(i, j int) bool {
+		if order == "desc" {
+			return series[i].Meta.Name > series[j].Meta.Name
+		} else {
+			return series[i].Meta.Name < series[j].Meta.Name
+		}
+	})
+
+	return series
+}