check topn results size (#148)

LGTM
grafadruid · Mar 7, 2023 · cf04100 · cf04100
1 parent fe9a7a5
commit cf04100
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/pkg/druid.go b/pkg/druid.go
@@ -554,7 +554,7 @@ func (ds *druidDatasource) executeQuery(queryRef string, q druidquerybuilder.Que
 	case "topN":
 		var tn []map[string]interface{}
 		err := json.Unmarshal(result, &tn)
-		if err == nil && len(tn) > 0 {
+		if err == nil && len(tn) > 0 && len(tn[0]["result"].([]interface{})) > 0 {
 			columns := []string{"timestamp"}
 			for c := range tn[0]["result"].([]interface{})[0].(map[string]interface{}) {
 				columns = append(columns, c)