Inspector: Show transformation query errors (#73344)

public/app/features/dashboard/components/Inspector/InspectContent.tsx

@@ -1,7 +1,16 @@
 import { isEmpty } from 'lodash';
 import React, { useState } from 'react';
 
-import { CoreApp, DataSourceApi, formattedValueToString, getValueFormat, PanelData, PanelPlugin } from '@grafana/data';
+import {
+  CoreApp,
+  DataSourceApi,
+  formattedValueToString,
+  getValueFormat,
+  PanelData,
+  PanelPlugin,
+  LoadingState,
+  DataQueryError,
+} from '@grafana/data';
 import { getTemplateSrv } from '@grafana/runtime';
 import { Drawer, Tab, TabsBar } from '@grafana/ui';
 import { t, Trans } from 'app/core/internationalization';
@@ -51,10 +60,7 @@ export const InspectContent = ({
     return null;
   }
 
-  let errors = data?.errors;
-  if (!errors?.length && data?.error) {
-    errors = [data.error];
-  }
+  let errors = getErrors(data);
 
   // Validate that the active tab is actually valid and allowed
   let activeTab = currentTab;
@@ -114,6 +120,22 @@ export const InspectContent = ({
   );
 };
 
+// This will combine
+function getErrors(data: PanelData | undefined): DataQueryError[] {
+  let errors = data?.errors ?? [];
+  if (data?.error && !errors.includes(data.error)) {
+    errors = [data.error, ...errors];
+  }
+  if (!errors.length && data?.state === LoadingState.Error) {
+    return [
+      {
+        message: 'Error loading data',
+      },
+    ];
+  }
+  return errors;
+}
+
 function formatStats(data: PanelData) {
   const { request } = data;
 

public/app/features/dashboard/components/Inspector/PanelInspector.tsx

@@ -28,16 +28,16 @@ export interface ConnectedProps {
 export type Props = OwnProps & ConnectedProps;
 
 const PanelInspectorUnconnected = ({ panel, dashboard, plugin }: Props) => {
+  const location = useLocation();
+  const defaultTab = new URLSearchParams(location.search).get('inspectTab') as InspectTab;
   const [dataOptions, setDataOptions] = useState<GetDataOptions>({
-    withTransforms: false,
+    withTransforms: defaultTab === InspectTab.Error,
     withFieldConfig: true,
   });
 
-  const location = useLocation();
-  const { data, isLoading, error } = usePanelLatestData(panel, dataOptions, false);
+  const { data, isLoading, hasError } = usePanelLatestData(panel, dataOptions, true);
   const metaDs = useDatasourceMetadata(data);
-  const tabs = useInspectTabs(panel, dashboard, plugin, error, metaDs);
-  const defaultTab = new URLSearchParams(location.search).get('inspectTab') as InspectTab;
+  const tabs = useInspectTabs(panel, dashboard, plugin, hasError, metaDs);
 
   const onClose = () => {
     locationService.partial({

public/app/features/dashboard/components/Inspector/hooks.ts

@@ -1,7 +1,7 @@
 import { useMemo } from 'react';
 import useAsync from 'react-use/lib/useAsync';
 
-import { DataQueryError, DataSourceApi, PanelData, PanelPlugin } from '@grafana/data';
+import { DataSourceApi, PanelData, PanelPlugin } from '@grafana/data';
 import { getDataSourceSrv } from '@grafana/runtime';
 import { t } from 'app/core/internationalization';
 import { DashboardModel, PanelModel } from 'app/features/dashboard/state';
@@ -42,7 +42,7 @@ export const useInspectTabs = (
   panel: PanelModel,
   dashboard: DashboardModel,
   plugin: PanelPlugin | undefined | null,
-  error?: DataQueryError,
+  hasError?: boolean,
   metaDs?: DataSourceApi
 ) => {
   return useMemo(() => {
@@ -58,7 +58,7 @@ export const useInspectTabs = (
 
     tabs.push({ label: t('dashboard.inspect.json-tab', 'JSON'), value: InspectTab.JSON });
 
-    if (error && error.message) {
+    if (hasError) {
       tabs.push({ label: t('dashboard.inspect.error-tab', 'Error'), value: InspectTab.Error });
     }
 
@@ -66,5 +66,5 @@ export const useInspectTabs = (
       tabs.push({ label: t('dashboard.inspect.query-tab', 'Query'), value: InspectTab.Query });
     }
     return tabs;
-  }, [plugin, metaDs, dashboard, error]);
+  }, [plugin, metaDs, dashboard, hasError]);
 };

public/app/features/dashboard/components/PanelEditor/usePanelLatestData.ts

@@ -1,14 +1,14 @@
 import { useEffect, useRef, useState } from 'react';
 import { Unsubscribable } from 'rxjs';
 
-import { DataQueryError, LoadingState, PanelData } from '@grafana/data';
+import { LoadingState, PanelData } from '@grafana/data';
 
 import { GetDataOptions } from '../../../query/state/PanelQueryRunner';
 import { PanelModel } from '../../state';
 
 interface UsePanelLatestData {
   data?: PanelData;
-  error?: DataQueryError;
+  hasError: boolean;
   isLoading: boolean;
   hasSeries: boolean;
 }
@@ -63,8 +63,10 @@ export const usePanelLatestData = (
 
   return {
     data: latestData,
-    error: latestData && latestData.error,
     isLoading: latestData?.state === LoadingState.Loading,
     hasSeries: latestData ? !!latestData.series : false,
+    hasError: Boolean(
+      latestData && (latestData.error || latestData?.errors?.length || latestData.state === LoadingState.Error)
+    ),
   };
 };

public/app/features/inspector/InspectErrorTab.tsx

@@ -67,7 +67,7 @@ export const InspectErrorTab = ({ errors }: InspectErrorTabProps) => {
   return (
     <>
       {errors.map((error, index) => (
-        <Alert title={error.refId || `Query ${index + 1}`} severity="error" key={index}>
+        <Alert title={error.refId || `Error ${index + 1}`} severity="error" key={index}>
           {renderError(error)}
         </Alert>
       ))}

public/app/features/query/state/PanelQueryRunner.ts

@@ -225,7 +225,7 @@ export class PanelQueryRunner {
         return of({
           ...data,
           state: LoadingState.Error,
-          error: toDataQueryError(err),
+          errors: [toDataQueryError(err)],
         });
       })
     );