Make d3 place nicely with object values

src/legacy/core_plugins/vis_default_editor/public/components/controls/date_ranges.tsx

@@ -125,7 +125,7 @@ function DateRangesParamEditor({
         </EuiText>
         <EuiSpacer size="s" />
 
-        {ranges.map(({ from, to, id }) => {
+        {ranges.map(({ from, to, id }, index) => {
           const deleteBtnTitle = i18n.translate(
             'visDefaultEditor.controls.dateRanges.removeRangeButtonAriaLabel',
             {
@@ -154,6 +154,7 @@ function DateRangesParamEditor({
                     placeholder={FROM_PLACEHOLDER}
                     value={from || ''}
                     onChange={ev => onChangeRange(id, 'from', ev.target.value)}
+                    data-test-subj={`visEditorDateRange${index}__from`}
                   />
                 </EuiFlexItem>
                 <EuiFlexItem grow={false}>
@@ -168,6 +169,7 @@ function DateRangesParamEditor({
                         description: 'End of a date range, e.g. From 2018-02-26 *To* 2018-02-28',
                       }
                     )}
+                    data-test-subj={`visEditorDateRange${index}__to`}
                     compressed
                     fullWidth={true}
                     isInvalid={areBothEmpty || !validateDateMath(to)}
@@ -203,7 +205,12 @@ function DateRangesParamEditor({
 
         <EuiSpacer size="s" />
         <EuiFlexItem>
-          <EuiButtonEmpty iconType="plusInCircleFilled" onClick={onAddRange} size="xs">
+          <EuiButtonEmpty
+            iconType="plusInCircleFilled"
+            onClick={onAddRange}
+            size="xs"
+            data-test-subj="visEditorAddDateRange"
+          >
             <FormattedMessage
               id="visDefaultEditor.controls.dateRanges.addRangeButtonLabel"
               defaultMessage="Add range"

src/legacy/core_plugins/vis_type_vislib/public/vislib/lib/data.js

@@ -25,6 +25,26 @@ import { orderXValues } from '../components/zero_injection/ordered_x_keys';
 import { labels } from '../components/labels/labels';
 import { getFormatService } from '../../services';
 
+// X axis and split series values in a data table can sometimes be objects,
+// e.g. when working with date ranges. d3 casts all ordinal values to strings
+// which is a problem for these objects because they just return `[object Object]`
+// and thus all map to the same value.
+// This little helper overwrites the toString method of an object and keeps it the
+// same otherwise - allowing d3 to correctly work with the values.
+class D3MappableObject {
+  constructor(data) {
+    for (const key in data) {
+      if (data.hasOwnProperty(key)) {
+        this[key] = data[key];
+      }
+    }
+  }
+
+  toString() {
+    return JSON.stringify(this);
+  }
+}
+
 /**
  * Provides an API for pulling values off the data
  * and calculating values using the data
@@ -52,9 +72,14 @@ export class Data {
     const copyChart = data => {
       const newData = {};
       Object.keys(data).forEach(key => {
-        if (key !== 'series') {
-          newData[key] = data[key];
-        } else {
+        if (key === 'xAxisOrderedValues') {
+          newData[key] = data[key].map(val => {
+            if (typeof val === 'object') {
+              return new D3MappableObject(val);
+            }
+            return val;
+          });
+        } else if (key === 'series') {
           newData[key] = data[key].map(seri => {
             const converter = getFormatService().deserialize(seri.format);
             const zConverter = getFormatService().deserialize(seri.zFormat);
@@ -67,12 +92,17 @@ export class Data {
                 const newVal = _.clone(val);
                 newVal.extraMetrics = val.extraMetrics;
                 newVal.series = val.series || seri.label;
+                if (typeof newVal.x === 'object') {
+                  newVal.x = new D3MappableObject(newVal.x);
+                }
                 return newVal;
               }),
               yAxisFormatter: val => converter.convert(val),
               zAxisFormatter: val => zConverter.convert(val),
             };
           });
+        } else {
+          newData[key] = data[key];
         }
       });
 

test/functional/apps/visualize/_vertical_bar_chart.js

@@ -54,6 +54,25 @@ export default function({ getService, getPageObjects }) {
       });
     });
 
+    describe('bar charts range on x axis', () => {
+      it('should individual bars for each configured range', async function() {
+        await PageObjects.visualize.navigateToNewVisualization();
+        await PageObjects.visualize.clickVerticalBarChart();
+        await PageObjects.visualize.clickNewSearch();
+        await PageObjects.timePicker.setDefaultAbsoluteRange();
+        await PageObjects.visEditor.clickBucket('X-axis');
+        log.debug('Aggregation = Date Range');
+        await PageObjects.visEditor.selectAggregation('Date Range');
+        log.debug('Field = @timestamp');
+        await PageObjects.visEditor.selectField('@timestamp');
+        await PageObjects.visEditor.clickAddDateRange();
+        await PageObjects.visEditor.setDateRangeByIndex('1', 'now-2w/w', 'now-1w/w');
+        await PageObjects.visEditor.clickGo();
+        const bottomLabels = await PageObjects.visChart.getXAxisLabels();
+        expect(bottomLabels.length).to.be(2);
+      });
+    });
+
     // FLAKY: https://github.com/elastic/kibana/issues/22322
     describe.skip('vertical bar chart flaky part', function() {
       const vizName1 = 'Visualization VerticalBarChart';

test/functional/page_objects/visualize_editor_page.ts

@@ -103,6 +103,15 @@ export function VisualizeEditorPageProvider({ getService, getPageObjects }: FtrP
       await radioBtn.click();
     }
 
+    public async clickAddDateRange() {
+      await testSubjects.click(`visEditorAddDateRange`);
+    }
+
+    public async setDateRangeByIndex(index: string, from: string, to: string) {
+      await testSubjects.setValue(`visEditorDateRange${index}__from`, from);
+      await testSubjects.setValue(`visEditorDateRange${index}__to`, to);
+    }
+
     /**
      * Adds new bucket
      * @param bucketName bucket name, like 'X-axis', 'Split rows', 'Split series'