From cf041001bd8c34181e32e021be632c13ee8a4a99 Mon Sep 17 00:00:00 2001
From: jbguerraz <861556+jbguerraz@users.noreply.github.com>
Date: Tue, 7 Mar 2023 10:59:01 +0000
Subject: [PATCH] check topn results size (#148)

LGTM
---
 pkg/druid.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkg/druid.go b/pkg/druid.go
index 0e15d91..521d2a9 100644
--- 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)