Allow histogram fields in average and sum aggregations (#66891)

* Allow histogram fields in average and sum aggs

* Fix PR review

Author: Tim Roes

src/plugins/data/public/search/aggs/metrics/avg.ts

@@ -51,7 +51,7 @@ export const getAvgMetricAgg = ({ getInternalStartServices }: AvgMetricAggDepend
         {
           name: 'field',
           type: 'field',
-          filterFieldTypes: KBN_FIELD_TYPES.NUMBER,
+          filterFieldTypes: [KBN_FIELD_TYPES.NUMBER, KBN_FIELD_TYPES.HISTOGRAM],
         },
       ],
     },

src/plugins/data/public/search/aggs/metrics/sum.ts

@@ -54,7 +54,7 @@ export const getSumMetricAgg = ({ getInternalStartServices }: SumMetricAggDepend
         {
           name: 'field',
           type: 'field',
-          filterFieldTypes: KBN_FIELD_TYPES.NUMBER,
+          filterFieldTypes: [KBN_FIELD_TYPES.NUMBER, KBN_FIELD_TYPES.HISTOGRAM],
         },
       ],
     },

test/functional/page_objects/visualize_chart_page.ts

@@ -312,6 +312,7 @@ export function VisualizeChartPageProvider({ getService, getPageObjects }: FtrPr
 
     /**
      * If you are writing new tests, you should rather look into getTableVisContent method instead.
+     * @deprecated Use getTableVisContent instead.
      */
     public async getTableVisData() {
       return await testSubjects.getVisibleText('paginated-table-body');

x-pack/test/functional/apps/visualize/precalculated_histogram.ts

@@ -24,37 +24,62 @@ export default function({ getService, getPageObjects }: FtrProviderContext) {
       return esArchiver.unload('pre_calculated_histogram');
     });
 
-    const initHistogramBarChart = async () => {
-      await PageObjects.visualize.navigateToNewVisualization();
-      await PageObjects.visualize.clickVerticalBarChart();
-      await PageObjects.visualize.clickNewSearch('histogram-test');
-      await PageObjects.visChart.waitForVisualization();
-    };
-
-    const getFieldOptionsForAggregation = async (aggregation: string): Promise<string[]> => {
-      await PageObjects.visEditor.clickBucket('Y-axis', 'metrics');
-      await PageObjects.visEditor.selectAggregation(aggregation, 'metrics');
-      const fieldValues = await PageObjects.visEditor.getField();
-      return fieldValues;
-    };
-
     it('appears correctly in discover', async function() {
       await PageObjects.common.navigateToApp('discover');
       const rowData = await PageObjects.discover.getDocTableIndex(1);
       expect(rowData.includes('"values": [ 0.3, 1, 3, 4.2, 4.8 ]')).to.be.ok();
     });
 
-    it('appears in the field options of a Percentiles aggregation', async function() {
-      await initHistogramBarChart();
-      const fieldValues: string[] = await getFieldOptionsForAggregation('Percentiles');
-      log.debug('Percentiles Fields = ' + fieldValues);
-      expect(fieldValues[0]).to.be('histogram-content');
-    });
+    describe('works in visualizations', () => {
+      before(async () => {
+        await PageObjects.visualize.navigateToNewVisualization();
+        await PageObjects.visualize.clickDataTable();
+        await PageObjects.visualize.clickNewSearch('histogram-test');
+        await PageObjects.visChart.waitForVisualization();
+        await PageObjects.visEditor.clickMetricEditor();
+      });
+
+      const renderTableForAggregation = async (aggregation: string) => {
+        await PageObjects.visEditor.selectAggregation(aggregation, 'metrics');
+        await PageObjects.visEditor.selectField('histogram-content', 'metrics');
+        await PageObjects.visEditor.clickGo();
+
+        return await PageObjects.visChart.getTableVisContent();
+      };
+
+      it('with percentiles aggregation', async () => {
+        const data = (await renderTableForAggregation('Percentiles')) as string[][];
+        expect(data[0]).to.have.property('length', 7);
+        // Percentile values are not deterministic, so we can't check for the exact values here,
+        // but just check they are all within the given range
+        // see https://github.com/elastic/elasticsearch/issues/49225
+        expect(data[0].every((p: string) => Number(p) >= 0.3 && Number(p) <= 5)).to.be(true);
+      });
+
+      it('with percentile ranks aggregation', async () => {
+        const data = await renderTableForAggregation('Percentile Ranks');
+        expect(data).to.eql([['0%']]);
+      });
+
+      it('with average aggregation', async () => {
+        const data = await renderTableForAggregation('Average');
+        expect(data).to.eql([['2.8510720308359434']]);
+      });
+
+      it('with median aggregation', async () => {
+        // Percentile values (which are used by median behind the scenes) are not deterministic,
+        // so we can't check for the exact values here, but just check they are all within the given range
+        // see https://github.com/elastic/elasticsearch/issues/49225
+        const data = await renderTableForAggregation('Median');
+        const value = Number(data[0][0]);
+        expect(value).to.be.above(3.0);
+        expect(value).to.be.below(3.3);
+      });
 
-    it('appears in the field options of a Percentile Ranks aggregation', async function() {
-      const fieldValues: string[] = await getFieldOptionsForAggregation('Percentile Ranks');
-      log.debug('Percentile Ranks Fields = ' + fieldValues);
-      expect(fieldValues[0]).to.be('histogram-content');
+      it('with sum aggregation', async () => {
+        const data = await renderTableForAggregation('Sum');
+        expect(data).to.eql([['11834.800000000001']]);
+      });
     });
   });
 }