Fix Lens auto date bug (#49967)

x-pack/legacy/plugins/lens/public/indexpattern_plugin/auto_date.test.ts

@@ -0,0 +1,76 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { autoDate } from './auto_date';
+
+jest.mock('ui/new_platform');
+jest.mock('ui/chrome');
+
+describe('auto_date', () => {
+  it('should do nothing if no time range is provided', () => {
+    const result = autoDate.fn(
+      {
+        type: 'kibana_context',
+      },
+      {
+        aggConfigs: 'canttouchthis',
+      },
+      {}
+    );
+
+    expect(result).toEqual('canttouchthis');
+  });
+
+  it('should not change anything if there are no auto date histograms', () => {
+    const aggConfigs = JSON.stringify([
+      { type: 'date_histogram', params: { interval: '35h' } },
+      { type: 'count' },
+    ]);
+    const result = autoDate.fn(
+      {
+        timeRange: {
+          from: 'now-10d',
+          to: 'now',
+        },
+        type: 'kibana_context',
+      },
+      {
+        aggConfigs,
+      },
+      {}
+    );
+
+    expect(result).toEqual(aggConfigs);
+  });
+
+  it('should change auto date histograms', () => {
+    const aggConfigs = JSON.stringify([
+      { type: 'date_histogram', params: { interval: 'auto' } },
+      { type: 'count' },
+    ]);
+    const result = autoDate.fn(
+      {
+        timeRange: {
+          from: 'now-10d',
+          to: 'now',
+        },
+        type: 'kibana_context',
+      },
+      {
+        aggConfigs,
+      },
+      {}
+    );
+
+    const interval = JSON.parse(result).find(
+      (agg: { type: string }) => agg.type === 'date_histogram'
+    ).params.interval;
+
+    expect(interval).toBeTruthy();
+    expect(typeof interval).toEqual('string');
+    expect(interval).not.toEqual('auto');
+  });
+});

x-pack/legacy/plugins/lens/public/indexpattern_plugin/auto_date.ts

@@ -89,7 +89,7 @@ export const autoDate: ExpressionFunction<
         ...c,
         params: {
           ...c.params,
-          interval: interval.expression,
+          interval,
         },
       };
     });