From d46acaf1dd7b3d5bda91118d6e2d7b2ca74ece56 Mon Sep 17 00:00:00 2001
From: "Grot (@grafanabot)" <43478413+grafanabot@users.noreply.github.com>
Date: Sun, 28 Feb 2021 07:11:16 +0000
Subject: [PATCH] Variables: Fixes error with: cannot read property length of
 undefined (#31458) (#31527)
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* Variables: Fixes error with: cannot read property length of undefined

* A different fix

(cherry picked from commit e9d259248110102ef0f2986f819e600dabd6f42d)

Co-authored-by: Torkel Ödegaard <torkel@grafana.org>
---
 public/app/features/variables/query/operators.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/public/app/features/variables/query/operators.ts b/public/app/features/variables/query/operators.ts
index 5aa6e75661a..5e31cd3b83d 100644
--- a/public/app/features/variables/query/operators.ts
+++ b/public/app/features/variables/query/operators.ts
@@ -9,6 +9,7 @@ import { DataSourceApi, FieldType, getFieldDisplayName, isDataFrame, MetricFindV
 import { updateVariableOptions, updateVariableTags } from './reducer';
 import { getTimeSrv, TimeSrv } from '../../dashboard/services/TimeSrv';
 import { getLegacyQueryOptions, getTemplatedRegex } from '../utils';
+import { getProcessedDataFrames } from 'app/features/query/state/runRequest';
 
 export function toMetricFindValues(): OperatorFunction<PanelData, MetricFindValue[]> {
   return (source) =>
@@ -23,6 +24,7 @@ export function toMetricFindValues(): OperatorFunction<PanelData, MetricFindValu
           return frames;
         }
 
+        const processedDataFrames = getProcessedDataFrames(frames);
         const metrics: MetricFindValue[] = [];
 
         let valueIndex = -1;
@@ -30,7 +32,7 @@ export function toMetricFindValues(): OperatorFunction<PanelData, MetricFindValu
         let stringIndex = -1;
         let expandableIndex = -1;
 
-        for (const frame of frames) {
+        for (const frame of processedDataFrames) {
           for (let index = 0; index < frame.fields.length; index++) {
             const field = frame.fields[index];
             const fieldName = getFieldDisplayName(field, frame, frames).toLowerCase();
@@ -181,6 +183,7 @@ export function areMetricFindValues(data: any[]): data is MetricFindValue[] {
   }
 
   const firstValue: any = data[0];
+
   if (isDataFrame(firstValue)) {
     return false;
   }