SBIN2010 commented on code in PR #43938:
URL: https://github.com/apache/superset/pull/43938#discussion_r4148114536


##########
superset-frontend/packages/superset-ui-chart-controls/src/utils/headerGroups.ts:
##########
@@ -0,0 +1,876 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { t } from '@apache-superset/core/translation';
+import {
+  ComparisonType,
+  ensureIsArray,
+  getColumnLabel,
+  getMetricLabel,
+  QueryFormColumn,
+  QueryFormMetric,
+  QueryMode,
+  SqlaFormData,
+} from '@superset-ui/core';
+import { isEmpty, last } from 'lodash-es';
+import {
+  isPercentMetric,
+  isRegularMetric,
+  shouldSkipMetricColumn,
+} from './metricColumnFilter';
+
+export type HeaderGroupLabelAlign = 'left' | 'center' | 'right';
+
+export type HeaderGroupPlacement = 'left' | 'right';
+
+export type HeaderGroupConfig = {
+  id: string;
+  label: string;
+  columns: string[];
+  labelAlign?: HeaderGroupLabelAlign;
+  placement?: HeaderGroupPlacement;
+  source?: 'time_compare';
+  children?: HeaderGroupConfig[];
+};
+
+export type HeaderGroupCell = {
+  key: string;
+  label: string;
+  colSpan: number;
+  rowSpan: number;
+  columnIndex: number;
+  labelAlign?: HeaderGroupLabelAlign;
+  isLastColumn: boolean;
+};
+
+export const TIME_COMPARE_MAIN_KEY = 'Main';
+
+const TIME_COMPARE_SYMBOL_PREFIXES = ['#', '△', '%'] as const;
+
+type TimeCompareSlot = {
+  metric: string;
+  isMain: boolean;
+  prefix: string;
+};
+
+function getMainComparisonPrefixes(): string[] {
+  return [...new Set([t('Main'), TIME_COMPARE_MAIN_KEY])];
+}
+
+function isTimeCompareSymbolPrefix(
+  prefix: string,
+): prefix is (typeof TIME_COMPARE_SYMBOL_PREFIXES)[number] {
+  return (TIME_COMPARE_SYMBOL_PREFIXES as readonly string[]).includes(prefix);
+}
+
+function parseTimeComparisonSlot(column: string): TimeCompareSlot | null {
+  for (const prefix of TIME_COMPARE_SYMBOL_PREFIXES) {
+    if (column.startsWith(`${prefix} `)) {
+      return { metric: column.slice(prefix.length + 1), isMain: false, prefix 
};
+    }
+  }
+  for (const prefix of getMainComparisonPrefixes()) {
+    if (column.startsWith(`${prefix} `)) {
+      return {
+        metric: column.slice(prefix.length + 1),
+        isMain: true,
+        prefix: TIME_COMPARE_MAIN_KEY,
+      };
+    }
+  }
+  return null;
+}
+
+function inferMainSlotFromSiblings(
+  column: string,
+  visibleKeys: string[],
+): TimeCompareSlot | null {
+  const space = column.indexOf(' ');
+  if (space <= 0) {
+    return null;
+  }
+  const metric = column.slice(space + 1);
+  if (
+    !metric ||
+    !TIME_COMPARE_SYMBOL_PREFIXES.some(symbol =>
+      visibleKeys.includes(`${symbol} ${metric}`),
+    )
+  ) {
+    return null;
+  }
+  return { metric, isMain: true, prefix: TIME_COMPARE_MAIN_KEY };
+}
+
+function resolveTimeComparisonSlotKeys(
+  slot: TimeCompareSlot,
+  visibleKeys: string[],
+): string[] {
+  if (!slot.isMain) {
+    const key = `${slot.prefix} ${slot.metric}`;
+    return visibleKeys.filter(item => item === key);
+  }
+  const wanted = new Set(
+    getMainComparisonPrefixes().map(prefix => `${prefix} ${slot.metric}`),
+  );
+  const matches = visibleKeys.filter(key => wanted.has(key));
+  if (matches.length > 0) {
+    return matches;
+  }
+  const alternatives = visibleKeys.filter(key => {
+    const space = key.indexOf(' ');
+    if (space <= 0) {
+      return false;
+    }
+    const prefix = key.slice(0, space);
+    return (
+      !isTimeCompareSymbolPrefix(prefix) && key.slice(space + 1) === 
slot.metric
+    );
+  });
+  return alternatives.length === 1 ? alternatives : [];
+}
+
+/**
+ * Locale-independent comparison column keys. `Main` is a stored slot id.
+ * Chart headers display `t('Main')` and may use a translated data key.
+ */
+export function getTimeComparisonColumnKeys(colname: string): string[] {
+  return [
+    `${TIME_COMPARE_MAIN_KEY} ${colname}`,
+    `# ${colname}`,
+    `△ ${colname}`,
+    `% ${colname}`,
+  ];
+}
+
+export function toStoredTimeComparisonColumnKey(
+  column: string,
+  visibleKeys: string[] = [],
+): string {
+  const slot =
+    parseTimeComparisonSlot(column) ??
+    inferMainSlotFromSiblings(column, visibleKeys);
+  if (!slot) {
+    return column;
+  }
+  if (
+    visibleKeys.length > 0 &&
+    resolveTimeComparisonSlotKeys(slot, visibleKeys).length === 0
+  ) {
+    return column;
+  }
+  return slot.isMain
+    ? `${TIME_COMPARE_MAIN_KEY} ${slot.metric}`
+    : `${slot.prefix} ${slot.metric}`;
+}
+
+export function expandGroupColumnKey(
+  identifier: string,
+  visibleKeys: string[],
+): string[] {
+  const visible = new Set(visibleKeys);
+  if (visible.has(identifier)) {
+    return [identifier];
+  }
+  const slot =
+    parseTimeComparisonSlot(identifier) ??
+    inferMainSlotFromSiblings(identifier, visibleKeys);
+  if (slot) {
+    return resolveTimeComparisonSlotKeys(slot, visibleKeys);
+  }
+  const candidates = [
+    `%${identifier}`,
+    ...getTimeComparisonColumnKeys(identifier),
+    `${t('Main')} ${identifier}`,
+  ];
+  const matchSet = new Set(candidates.filter(key => visible.has(key)));
+  return visibleKeys.filter(key => matchSet.has(key));
+}
+
+export function buildTimeComparisonHeaderGroups(
+  metricKeys: string[],
+  labelFor: (key: string) => string = key => key,
+): HeaderGroupConfig[] {
+  return metricKeys.map(key => ({
+    id: `time-compare-${key}`,
+    label: labelFor(key),
+    columns: getTimeComparisonColumnKeys(key),
+    labelAlign: 'left',
+    placement: 'right',
+    source: 'time_compare',
+  }));
+}
+
+function isTimeComparisonSlotKey(column: string, prefix: string): boolean {
+  return column.startsWith(`${prefix} `);
+}
+
+function remapTimeComparisonColumns(
+  columns: string[],
+  currentKeys: string[],
+): string[] {
+  const currentSet = new Set(currentKeys);
+  if (columns.every(column => currentSet.has(column))) {
+    return columns;
+  }
+  const mainKey = currentKeys.find(
+    key =>
+      !isTimeComparisonSlotKey(key, '#') &&
+      !isTimeComparisonSlotKey(key, '△') &&
+      !isTimeComparisonSlotKey(key, '%'),
+  );
+  const hashKey = currentKeys.find(key => isTimeComparisonSlotKey(key, '#'));
+  const deltaKey = currentKeys.find(key => isTimeComparisonSlotKey(key, '△'));
+  const percentKey = currentKeys.find(key => isTimeComparisonSlotKey(key, 
'%'));
+  const remapped = columns
+    .map(column => {
+      if (currentSet.has(column)) {
+        return column;
+      }
+      if (isTimeComparisonSlotKey(column, '#')) {
+        return hashKey;
+      }
+      if (isTimeComparisonSlotKey(column, '△')) {
+        return deltaKey;
+      }
+      if (isTimeComparisonSlotKey(column, '%')) {
+        return percentKey;
+      }
+      return mainKey;
+    })
+    .filter((column): column is string => Boolean(column));
+  return remapped.length > 0 ? [...new Set(remapped)] : currentKeys;
+}
+
+function refreshTimeComparisonGroup(
+  group: HeaderGroupConfig,
+  currentKeys: string[],
+  replaceColumns: boolean,
+  nextLabel?: string,
+): HeaderGroupConfig {
+  return {
+    ...group,
+    ...(replaceColumns && nextLabel !== undefined ? { label: nextLabel } : {}),
+    columns: replaceColumns
+      ? currentKeys
+      : remapTimeComparisonColumns(group.columns ?? [], currentKeys),
+    children: group.children?.map(child =>
+      refreshTimeComparisonGroup(child, currentKeys, false),
+    ),
+  };
+}
+
+function remapUserGroupComparisonColumns(
+  group: HeaderGroupConfig,
+  visibleKeys: string[],
+): HeaderGroupConfig {
+  return {
+    ...group,
+    columns: (group.columns ?? []).map(column =>
+      toStoredTimeComparisonColumnKey(column, visibleKeys),
+    ),
+    children: group.children?.map(child =>
+      remapUserGroupComparisonColumns(child, visibleKeys),
+    ),
+  };
+}
+
+export function syncTimeComparisonGroups(
+  groups: HeaderGroupConfig[],
+  timeComparisonGroups: HeaderGroupConfig[] = [],
+): HeaderGroupConfig[] {
+  const autoById = new Map(
+    timeComparisonGroups.map(group => [group.id, group]),
+  );
+  const existingAutoIds = new Set(
+    groups
+      .filter(group => group.source === 'time_compare')
+      .map(group => group.id),
+  );
+  const comparisonKeys = timeComparisonGroups.flatMap(
+    group => group.columns ?? [],
+  );
+  const kept = groups
+    .filter(group => group.source !== 'time_compare' || autoById.has(group.id))
+    .map(group => {
+      if (group.source !== 'time_compare') {
+        return remapUserGroupComparisonColumns(group, comparisonKeys);
+      }
+      const fresh = autoById.get(group.id) as HeaderGroupConfig;
+      return refreshTimeComparisonGroup(
+        group,
+        fresh.columns,
+        true,
+        fresh.label,
+      );
+    });
+  const missing = timeComparisonGroups.filter(
+    group => !existingAutoIds.has(group.id),
+  );
+  return missing.length === 0 ? kept : [...kept, ...missing];
+}
+
+export function headerGroupsHaveSameContent(
+  left: HeaderGroupConfig[],
+  right: HeaderGroupConfig[],
+): boolean {
+  if (left.length !== right.length) {
+    return false;
+  }
+  return left.every((group, index) => {
+    const other = right[index];
+    if (
+      group.id !== other.id ||
+      group.label !== other.label ||
+      group.columns.length !== other.columns.length ||
+      group.columns.some(
+        (column, colIndex) => column !== other.columns[colIndex],
+      )
+    ) {
+      return false;
+    }
+    return headerGroupsHaveSameContent(
+      group.children ?? [],
+      other.children ?? [],
+    );
+  });
+}
+
+function labelFromVerboseMap(
+  key: string,
+  verboseMap?: Record<string, string> | string[] | null,
+): string {
+  if (!verboseMap || Array.isArray(verboseMap)) {
+    return key;
+  }
+  if (key.startsWith('%')) {
+    const baseKey = key.replace('%', '');
+    if (Object.prototype.hasOwnProperty.call(verboseMap, baseKey)) {
+      return `%${verboseMap[baseKey]}`;
+    }
+  }
+  return verboseMap[key] ?? key;
+}
+
+function columnOptionLabel(
+  colname: string,
+  verboseMap?: Record<string, string> | string[] | null,
+): string {
+  const slot = parseTimeComparisonSlot(colname);
+  if (!slot) {
+    return labelFromVerboseMap(colname, verboseMap);
+  }
+  const metricLabel = labelFromVerboseMap(slot.metric, verboseMap);
+  const prefix = slot.isMain ? t('Main') : slot.prefix;
+  return `${prefix} ${metricLabel}`;
+}
+
+export function resolveHeaderGroups(
+  headerGroups: HeaderGroupConfig[] | undefined,
+  options: {
+    timeCompareEnabled: boolean;
+    metricKeys: string[];
+    verboseMap?: Record<string, string> | string[] | null;
+  },
+): HeaderGroupConfig[] {
+  return syncTimeComparisonGroups(
+    headerGroups ?? [],
+    options.timeCompareEnabled
+      ? buildTimeComparisonHeaderGroups(options.metricKeys, key =>
+          labelFromVerboseMap(key, options.verboseMap),
+        )
+      : [],
+  );
+}
+
+function splitChildGroups(group: HeaderGroupConfig): {
+  left: HeaderGroupConfig[];
+  right: HeaderGroupConfig[];
+} {
+  const children = group.children ?? [];
+  return {
+    left: children.filter(child => child.placement === 'left'),
+    right: children.filter(child => child.placement !== 'left'),
+  };
+}
+
+export function collectHeaderGroupLeaves(group: HeaderGroupConfig): string[] {
+  const { left, right } = splitChildGroups(group);
+  return [
+    ...left.flatMap(collectHeaderGroupLeaves),
+    ...(group.columns ?? []),
+    ...right.flatMap(collectHeaderGroupLeaves),
+  ];
+}
+
+export function getHeaderGroupDepth(group: HeaderGroupConfig): number {
+  const children = group.children ?? [];
+  if (children.length === 0) {
+    return 1;
+  }
+  return 1 + Math.max(...children.map(getHeaderGroupDepth));
+}
+
+export function getHeaderGroupsMaxDepth(groups: HeaderGroupConfig[]): number {
+  if (groups.length === 0) {
+    return 0;
+  }
+  return Math.max(...groups.map(getHeaderGroupDepth));
+}
+
+type AncestorInfo = {
+  labels: string[];
+  ids: string[];
+  aligns: HeaderGroupLabelAlign[];
+};
+
+function buildAncestorMap(
+  groups: HeaderGroupConfig[],
+  visibleKeys: string[],
+  ancestors: AncestorInfo = { labels: [], ids: [], aligns: [] },
+  map: Map<string, AncestorInfo> = new Map(),
+): Map<string, AncestorInfo> {
+  groups.forEach(group => {
+    const next = {
+      labels: [...ancestors.labels, group.label],
+      ids: [...ancestors.ids, group.id],
+      aligns: [...ancestors.aligns, group.labelAlign ?? 'center'],
+    };
+    (group.columns ?? []).forEach(column => {
+      expandGroupColumnKey(column, visibleKeys).forEach(key => {
+        if (!map.has(key)) {
+          map.set(key, next);
+        }
+      });
+    });
+    if (group.children?.length) {
+      buildAncestorMap(group.children, visibleKeys, next, map);
+    }
+  });
+  return map;
+}
+
+function collectGroupedColumns<T extends { key: string; metricName?: string }>(
+  groups: HeaderGroupConfig[],
+  columns: T[],
+  byKey: Map<string, T>,
+  seen: Set<string>,
+): T[] {
+  const visibleKeys = columns.map(column => column.key);
+  return groups.flatMap(collectHeaderGroupLeaves).reduce<T[]>((acc, key) => {
+    const resolvedKeys = [
+      ...expandGroupColumnKey(key, visibleKeys),
+      ...columns
+        .filter(column => column.metricName === key && !seen.has(column.key))
+        .map(column => column.key),
+    ];
+    resolvedKeys.forEach(resolvedKey => {
+      const column = byKey.get(resolvedKey);
+      if (!column || seen.has(resolvedKey)) {
+        return;
+      }
+      seen.add(resolvedKey);
+      acc.push(column);
+    });
+    return acc;
+  }, []);
+}
+
+export function orderColumnsByHeaderGroups<
+  T extends { key: string; metricName?: string },
+>(columns: T[], groups: HeaderGroupConfig[]): T[] {
+  const visibleKeys = columns.map(column => column.key);
+  const identifiers = groups.flatMap(collectHeaderGroupLeaves);
+  const leafSet = new Set([
+    ...identifiers.flatMap(key => expandGroupColumnKey(key, visibleKeys)),
+    ...columns
+      .filter(
+        column => column.metricName && identifiers.includes(column.metricName),
+      )
+      .map(column => column.key),
+  ]);
+  const byKey = new Map(columns.map(column => [column.key, column]));
+  const ungrouped = columns.filter(column => !leafSet.has(column.key));
+  const seen = new Set<string>();
+  const leftGroups = groups.filter(group => group.placement === 'left');
+  const rightGroups = groups.filter(group => group.placement !== 'left');
+  const leftGrouped = collectGroupedColumns(leftGroups, columns, byKey, seen);
+  const rightGrouped = collectGroupedColumns(rightGroups, columns, byKey, 
seen);
+  return [...leftGrouped, ...ungrouped, ...rightGrouped];
+}
+
+export function buildHeaderGroupRows(
+  groups: HeaderGroupConfig[],
+  columnKeys: string[],
+): HeaderGroupCell[][] {
+  const ancestorMap = buildAncestorMap(groups, columnKeys);
+  const maxDepth = getHeaderGroupsMaxDepth(groups);
+  if (maxDepth === 0 || columnKeys.length === 0 || ancestorMap.size === 0) {
+    return [];
+  }
+
+  const covered: boolean[][] = Array.from({ length: maxDepth }, () =>
+    Array.from({ length: columnKeys.length }, () => false),
+  );
+  const rows: HeaderGroupCell[][] = Array.from({ length: maxDepth }, () => []);
+
+  for (let level = 0; level < maxDepth; level += 1) {
+    let colIndex = 0;
+    while (colIndex < columnKeys.length) {
+      if (covered[level][colIndex]) {
+        colIndex += 1;
+        continue;
+      }
+
+      const columnKey = columnKeys[colIndex];
+      const ancestor = ancestorMap.get(columnKey);
+      const labels = ancestor?.labels ?? [];
+      const ids = ancestor?.ids ?? [];
+      const label = labels[level];
+
+      if (label !== undefined) {
+        let colSpan = 1;
+        while (colIndex + colSpan < columnKeys.length) {
+          const nextLabels =
+            ancestorMap.get(columnKeys[colIndex + colSpan])?.labels ?? [];
+          const sharesPrefix = labels
+            .slice(0, level + 1)
+            .every((item, index) => nextLabels[index] === item);

Review Comment:
   fix in d3b29f52b2 — Adjacent groups with identical text (Total / Total) no 
longer merge into a single cell.



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