From d3bf7eb74edf379d77042cf1e22225fc5ade5f4e Mon Sep 17 00:00:00 2001
From: Alexander Zobnin <alexanderzobnin@gmail.com>
Date: Wed, 22 Sep 2021 14:57:38 +0300
Subject: [PATCH] Fix conversion to wide data frame, fixes #1309

---
 src/datasource-zabbix/responseHandler.ts | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/datasource-zabbix/responseHandler.ts b/src/datasource-zabbix/responseHandler.ts
index 91465b0..e66cd6c 100644
--- a/src/datasource-zabbix/responseHandler.ts
+++ b/src/datasource-zabbix/responseHandler.ts
@@ -316,7 +316,8 @@ export function alignFrames(data: MutableDataFrame[]): MutableDataFrame[] {
 }
 
 export function convertToWide(data: MutableDataFrame[]): DataFrame[] {
-  const timeField = data[0].fields.find(f => f.type === FieldType.time);
+  const maxLengthIndex = getLongestFrame(data);
+  const timeField = data[maxLengthIndex].fields.find(f => f.type === FieldType.time);
   if (!timeField) {
     return [];
   }
@@ -347,6 +348,20 @@ export function convertToWide(data: MutableDataFrame[]): DataFrame[] {
   return [frame];
 }
 
+function getLongestFrame(data: MutableDataFrame[]): number {
+  let maxLengthIndex = 0;
+  let maxLength = 0;
+  for (let i = 0; i < data.length; i++) {
+    const timeField = data[i].fields.find(f => f.type === FieldType.time);
+    if (timeField.values.length > maxLength) {
+      maxLength = timeField.values.length;
+      maxLengthIndex = i;
+    }
+  }
+
+  return maxLengthIndex;
+}
+
 function sortTimeseries(timeseries) {
   // Sort trend data, issue #202
   _.forEach(timeseries, series => {