Fix data source info is missing in default query when click Discover from other pages

changelogs/fragments/8583.yml

@@ -0,0 +1,2 @@
+fix:
+- Fix data source info is missing in default query when click Discover from other pages ([#8583](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/8583))

src/plugins/data/public/mocks.ts

@@ -83,7 +83,17 @@ const createStartContract = (isEnhancementsEnabled: boolean = false): Start => {
           fetchForWildcard: jest.fn(),
         },
       }),
-      get: jest.fn().mockReturnValue(Promise.resolve({})),
+      get: jest.fn().mockReturnValue(
+        Promise.resolve({
+          id: 'id',
+          name: 'name',
+          dataSourceRef: {
+            id: 'id',
+            type: 'datasource',
+            name: 'datasource',
+          },
+        })
+      ),
       getDefault: jest.fn().mockReturnValue(
         Promise.resolve({
           name: 'Default name',

src/plugins/data/public/query/query_string/dataset_service/dataset_service.test.ts

@@ -11,6 +11,7 @@ import { IDataPluginServices } from '../../../types';
 import { indexPatternTypeConfig } from './lib';
 import { dataPluginMock } from '../../../mocks';
 import { IndexPatternsContract } from '../../..';
+import { waitFor } from '@testing-library/dom';
 
 describe('DatasetService', () => {
   let service: DatasetService;
@@ -182,4 +183,52 @@ describe('DatasetService', () => {
     }
     expect(service.getRecentDatasets().length).toEqual(4);
   });
+
+  test('test get default dataset ', async () => {
+    jest.clearAllMocks();
+    uiSettings = coreMock.createSetup().uiSettings;
+    uiSettings.get = jest.fn().mockImplementation((setting: string) => {
+      if (setting === UI_SETTINGS.SEARCH_MAX_RECENT_DATASETS) {
+        return 4;
+      } else if (setting === 'defaultIndex') {
+        return 'id';
+      } else if (setting === UI_SETTINGS.QUERY_ENHANCEMENTS_ENABLED) {
+        return true;
+      }
+    });
+    sessionStorage = new DataStorage(window.sessionStorage, 'opensearchDashboards.');
+    mockDataPluginServices = {} as jest.Mocked<IDataPluginServices>;
+    service = new DatasetService(uiSettings, sessionStorage);
+    indexPatterns = {
+      ...dataPluginMock.createStartContract().indexPatterns,
+      getDataSource: jest.fn().mockReturnValue(
+        Promise.resolve({
+          id: 'id',
+          attributes: {
+            title: 'datasource',
+            dataSourceEngineType: 'OpenSearch',
+          },
+        })
+      ),
+    };
+    service.init(indexPatterns);
+
+    await waitFor(() => {
+      expect(service.getDefault()?.dataSource).toMatchObject({
+        id: 'id',
+        title: 'datasource',
+        type: 'OpenSearch',
+      });
+    });
+
+    indexPatterns = {
+      ...dataPluginMock.createStartContract().indexPatterns,
+      getDataSource: jest.fn().mockReturnValue(Promise.resolve()),
+    };
+    service.init(indexPatterns);
+
+    await waitFor(() => {
+      expect(service.getDefault()?.dataSource).toBe(undefined);
+    });
+  });
 });

src/plugins/data/public/query/query_string/dataset_service/dataset_service.ts

@@ -256,15 +256,28 @@ export class DatasetService {
       return undefined;
     }
 
+    let dataSource;
+    if (indexPattern.dataSourceRef) {
+      dataSource = await this.indexPatterns?.getDataSource(indexPattern.dataSourceRef?.id);
+    }
+
     const dataType = this.typesRegistry.get(DEFAULT_DATA.SET_TYPES.INDEX_PATTERN);
     if (dataType) {
       const dataset = dataType.toDataset([
         {
           id: indexPattern.id,
           title: indexPattern.title,
           type: DEFAULT_DATA.SET_TYPES.INDEX_PATTERN,
+          parent: dataSource
+            ? {
+                id: dataSource.id,
+                title: dataSource.attributes?.title,
+                type: dataSource.attributes?.dataSourceEngineType,
+              }
+            : undefined,
         },
       ]);
+
       return { ...dataset, timeFieldName: indexPattern.timeFieldName };
     }