fix(plugin-chart-echarts): force min y-tick for log axis with zero

superset-frontend/plugins/plugin-chart-echarts/src/Timeseries/transformProps.ts

@@ -53,14 +53,15 @@ import { DEFAULT_FORM_DATA } from './constants';
 import { ForecastSeriesEnum, ForecastValue, Refs } from '../types';
 import { parseYAxisBound } from '../utils/controls';
 import {
+  calculateLowerLogTick,
   currentSeries,
   dedupSeries,
+  extractDataTotalValues,
   extractSeries,
+  extractShowValueIndexes,
   getAxisType,
   getColtypesMapping,
   getLegendProps,
-  extractDataTotalValues,
-  extractShowValueIndexes,
 } from '../utils/series';
 import {
   extractAnnotationLabels,
@@ -199,20 +200,23 @@ export default function transformProps(
 
   const isMultiSeries = groupby.length || metrics.length > 1;
 
-  const [rawSeries, sortedTotalValues] = extractSeries(rebasedData, {
-    fillNeighborValue: stack && !forecastEnabled ? 0 : undefined,
-    xAxis: xAxisLabel,
-    extraMetricLabels,
-    stack,
-    totalStackedValues,
-    isHorizontal,
-    sortSeriesType,
-    sortSeriesAscending,
-    xAxisSortSeries: isMultiSeries ? xAxisSortSeries : undefined,
-    xAxisSortSeriesAscending: isMultiSeries
-      ? xAxisSortSeriesAscending
-      : undefined,
-  });
+  const [rawSeries, sortedTotalValues, minPositiveValue] = extractSeries(
+    rebasedData,
+    {
+      fillNeighborValue: stack && !forecastEnabled ? 0 : undefined,
+      xAxis: xAxisLabel,
+      extraMetricLabels,
+      stack,
+      totalStackedValues,
+      isHorizontal,
+      sortSeriesType,
+      sortSeriesAscending,
+      xAxisSortSeries: isMultiSeries ? xAxisSortSeries : undefined,
+      xAxisSortSeriesAscending: isMultiSeries
+        ? xAxisSortSeriesAscending
+        : undefined,
+    },
+  );
   const showValueIndexes = extractShowValueIndexes(rawSeries, {
     stack,
     onlyTotal,
@@ -358,6 +362,8 @@ export default function transformProps(
   if ((contributionMode === 'row' || isAreaExpand) && stack) {
     if (min === undefined) min = 0;
     if (max === undefined) max = 1;
+  } else if (logAxis && min === undefined && minPositiveValue !== undefined) {
+    min = calculateLowerLogTick(minPositiveValue);
   }
 
   const tooltipFormatter =

superset-frontend/plugins/plugin-chart-echarts/src/utils/series.ts

@@ -247,7 +247,7 @@ export function extractSeries(
     xAxisSortSeries?: SortSeriesType;
     xAxisSortSeriesAscending?: boolean;
   } = {},
-): [SeriesOption[], number[]] {
+): [SeriesOption[], number[], number | undefined] {
   const {
     fillNeighborValue,
     xAxis = DTTM_ALIAS,
@@ -261,7 +261,7 @@ export function extractSeries(
     xAxisSortSeries,
     xAxisSortSeriesAscending,
   } = opts;
-  if (data.length === 0) return [[], []];
+  if (data.length === 0) return [[], [], undefined];
   const rows: DataRecord[] = data.map(datum => ({
     ...datum,
     [xAxis]: datum[xAxis],
@@ -287,18 +287,27 @@ export function extractSeries(
           totalStackedValue: totalStackedValues[idx],
         }));
 
+  let minPositiveValue: number | undefined;
   const finalSeries = sortedSeries.map(name => ({
     id: name,
     name,
     data: sortedRows
       .map(({ row, totalStackedValue }, idx) => {
+        const currentValue = row[name];
+        if (
+          typeof currentValue === 'number' &&
+          currentValue > 0 &&
+          (minPositiveValue === undefined || minPositiveValue > currentValue)
+        ) {
+          minPositiveValue = currentValue;
+        }
         const isNextToDefinedValue =
           isDefined(rows[idx - 1]?.[name]) || isDefined(rows[idx + 1]?.[name]);
         const isFillNeighborValue =
-          !isDefined(row[name]) &&
+          !isDefined(currentValue) &&
           isNextToDefinedValue &&
           fillNeighborValue !== undefined;
-        let value: DataRecordValue | undefined = row[name];
+        let value: DataRecordValue | undefined = currentValue;
         if (isFillNeighborValue) {
           value = fillNeighborValue;
         } else if (
@@ -315,6 +324,7 @@ export function extractSeries(
   return [
     finalSeries,
     sortedRows.map(({ totalStackedValue }) => totalStackedValue),
+    minPositiveValue,
   ];
 }
 
@@ -518,3 +528,8 @@ export function getOverMaxHiddenFormatter(
     id: NumberFormats.OVER_MAX_HIDDEN,
   });
 }
+
+export function calculateLowerLogTick(minPositiveValue: number) {
+  const logBase10 = Math.floor(Math.log10(minPositiveValue));
+  return Math.pow(10, logBase10);
+}

superset-frontend/plugins/plugin-chart-echarts/test/utils/series.test.ts

@@ -25,6 +25,7 @@ import {
   supersetTheme as theme,
 } from '@superset-ui/core';
 import {
+  calculateLowerLogTick,
   dedupSeries,
   extractGroupbyLabel,
   extractSeries,
@@ -321,6 +322,7 @@ describe('extractSeries', () => {
         },
       ],
       totalStackedValues,
+      1,
     ]);
   });
 
@@ -366,6 +368,7 @@ describe('extractSeries', () => {
         },
       ],
       totalStackedValues,
+      1,
     ]);
   });
 
@@ -435,6 +438,7 @@ describe('extractSeries', () => {
         },
       ],
       totalStackedValues,
+      1,
     ]);
   });
 });
@@ -857,3 +861,12 @@ describe('getOverMaxHiddenFormatter', () => {
     expect(formatter.format(50000)).toEqual('50000');
   });
 });
+
+test('calculateLowerLogTick', () => {
+  expect(calculateLowerLogTick(1000000)).toEqual(1000000);
+  expect(calculateLowerLogTick(456)).toEqual(100);
+  expect(calculateLowerLogTick(100)).toEqual(100);
+  expect(calculateLowerLogTick(99)).toEqual(10);
+  expect(calculateLowerLogTick(2)).toEqual(1);
+  expect(calculateLowerLogTick(0.005)).toEqual(0.001);
+});