fix: check stats independently of plan

src/store/reducers/query/streamingReducers.ts

@@ -53,6 +53,13 @@ export const setStreamQueryResponse = (
         state.result.data.preparedPlan = Object.keys(planData).length > 0 ? planData : undefined;
         state.result.data.simplifiedPlan = simplifiedPlan;
         state.result.data.plan = chunk.plan;
+    }
+
+    if ('stats' in chunk) {
+        if (!state.result.data) {
+            state.result.data = prepareQueryData(null);
+        }
+
         state.result.data.stats = chunk.stats;
     }
 

tests/suites/tenant/queryEditor/models/QueryEditor.ts

@@ -349,4 +349,29 @@ export class QueryEditor {
 
         throw new Error(`Status did not change to ${expectedStatus} within ${timeout}ms`);
     }
+
+    async getStatsTabContent() {
+        // First navigate to Stats tab
+        await this.paneWrapper.selectTab(ResultTabNames.Stats);
+
+        // Get the stats content area
+        const statsContent = this.selector.locator('.ydb-query-result__result');
+        await statsContent.waitFor({state: 'visible', timeout: VISIBILITY_TIMEOUT});
+
+        return statsContent.innerText();
+    }
+
+    async hasStatsJsonViewer() {
+        // First navigate to Stats tab
+        await this.paneWrapper.selectTab(ResultTabNames.Stats);
+
+        // Check for JSON viewer element
+        const jsonViewer = this.selector.locator('.ydb-json-viewer');
+        try {
+            await jsonViewer.waitFor({state: 'visible', timeout: VISIBILITY_TIMEOUT});
+            return true;
+        } catch {
+            return false;
+        }
+    }
 }

tests/suites/tenant/queryEditor/queryEditor.test.ts

@@ -11,6 +11,7 @@ import {
     longRunningStreamQuery,
     longTableSelect,
     longerRunningStreamQuery,
+    simpleQuery,
 } from '../constants';
 
 import {
@@ -407,4 +408,42 @@ test.describe('Test Query Editor', async () => {
         // Verify clipboard contains the query result
         expect(clipboardContent).toContain('42');
     });
+
+    test.describe('Statistics Modes Tests', async () => {
+        test('Stats tab shows no stats message when STATISTICS_MODES.none', async ({page}) => {
+            const queryEditor = new QueryEditor(page);
+
+            // Set query and configure statistics mode to none
+            await queryEditor.setQuery(simpleQuery);
+            await queryEditor.clickGearButton();
+            await queryEditor.settingsDialog.changeStatsLevel(STATISTICS_MODES.none);
+            await queryEditor.settingsDialog.clickButton(ButtonNames.Save);
+
+            // Execute query
+            await queryEditor.clickRunButton();
+            await expect(queryEditor.waitForStatus('Completed')).resolves.toBe(true);
+
+            // Check Stats tab content
+            const statsContent = await queryEditor.getStatsTabContent();
+            expect(statsContent).toContain('There is no Stats for the request');
+        });
+
+        test('Stats tab shows JSON viewer when STATISTICS_MODES.basic', async ({page}) => {
+            const queryEditor = new QueryEditor(page);
+
+            // Set query and configure statistics mode to basic
+            await queryEditor.setQuery(simpleQuery);
+            await queryEditor.clickGearButton();
+            await queryEditor.settingsDialog.changeStatsLevel(STATISTICS_MODES.basic);
+            await queryEditor.settingsDialog.clickButton(ButtonNames.Save);
+
+            // Execute query
+            await queryEditor.clickRunButton();
+            await expect(queryEditor.waitForStatus('Completed')).resolves.toBe(true);
+
+            // Check that Stats tab contains JSON viewer
+            const hasJsonViewer = await queryEditor.hasStatsJsonViewer();
+            expect(hasJsonViewer).toBe(true);
+        });
+    });
 });