feat: implement aggregation methods with support for grouping and med…

adminforth/dataConnectors/clickhouse.ts

@@ -1,4 +1,4 @@
-import { IAdminForthDataSourceConnector, IAdminForthSingleFilter, IAdminForthAndOrFilter, AdminForthResource, AdminForthResourceColumn } from '../types/Back.js';
+import { IAdminForthDataSourceConnector, IAdminForthSingleFilter, IAdminForthAndOrFilter, AdminForthResource, AdminForthResourceColumn, IAggregationRule, IGroupByRule, IGroupByDateTrunc, IGroupByField } from '../types/Back.js';
 import AdminForthBaseConnector from './baseConnector.js';
 import dayjs from 'dayjs';
 import { createClient } from '@clickhouse/client'
@@ -444,13 +444,79 @@ class ClickhouseConnector extends AdminForthBaseConnector implements IAdminForth
       return { where, params };
     }
 
+    async getAggregateWithOriginalTypes({ resource, filters, aggregations, groupBy }: {
+      resource: AdminForthResource;
+      filters: IAdminForthAndOrFilter;
+      aggregations: { [alias: string]: IAggregationRule };
+      groupBy?: IGroupByRule;
+    }): Promise <Array<{ group?: string, [key: string]: any }>> {
+
+      const tableName = `${this.dbName}.${resource.table}`;
+
+      const selectParts: string[] = [];
+      let groupExpr: string | null = null;
+
+      if (groupBy?.type === 'date_trunc') {
+        const g = groupBy as IGroupByDateTrunc;
+        const tz = g.timezone ?? 'UTC';
+
+        const field = `toTimeZone(${g.field}, '${tz}')`;
+
+        switch (g.truncation) {
+          case 'day': groupExpr = `toDate(toStartOfDay(${field}))`; break;
+          case 'month': groupExpr = `toDate(toStartOfMonth(${field}))`; break;
+          case 'week': groupExpr = `toDate(toStartOfWeek(${field}))`; break;
+          case 'year': groupExpr = `toDate(toStartOfYear(${field}))`; break;
+        }
+
+        selectParts.push(`${groupExpr} AS \`group\``);
+
+      } else if (groupBy?.type === 'field') {
+        const g = groupBy as IGroupByField;
+        groupExpr = `${g.field}`;
+        selectParts.push(`${groupExpr} AS \`group\``);
+      }
+
+      for (const [alias, rule] of Object.entries(aggregations)) {
+        switch (rule.operation) {
+          case 'count': selectParts.push(`count() AS \`${alias}\``); break;
+          case 'sum': selectParts.push(`sum(${rule.field}) AS \`${alias}\``); break;
+          case 'avg': selectParts.push(`avg(${rule.field}) AS \`${alias}\``); break;
+          case 'min': selectParts.push(`min(${rule.field}) AS \`${alias}\``); break;
+          case 'max': selectParts.push(`max(${rule.field}) AS \`${alias}\``); break;
+          case 'median': selectParts.push(`quantile(0.5)(${rule.field}) AS \`${alias}\``); break;
+        }
+      }
+
+      const { where, params } = this.whereClause(resource, filters);
+
+      let query = `SELECT ${selectParts.join(', ')} FROM ${tableName} ${where}`;
+
+      if (groupExpr) {
+        query += ` GROUP BY ${groupExpr} ORDER BY ${groupExpr} ASC`;
+      }
+
+      const result = await this.client.query({
+        query,
+        format: 'JSONEachRow',
+        query_params: params,
+      });
+
+      const rows = await result.json();
+
+      return rows.map((r: any) => ({
+        group: r.group,
+        ...r,
+      }));
+    }
+
     async getDataWithOriginalTypes({ resource, limit, offset, sort, filters }: { 
         resource: AdminForthResource, 
         limit: number, 
         offset: number, 
         sort: { field: string, direction: AdminForthSortDirections }[], 
         filters: IAdminForthAndOrFilter,
-    }): Promise<any[]> {
+    }): Promise<Array<{ group?: string, [key: string]: any }>> {
       const columns = resource.dataSourceColumns.map((col) => {
         // for decimal cast to string
         if (col.type == AdminForthDataTypes.DECIMAL) {

adminforth/dataConnectors/mongo.ts

@@ -1,7 +1,7 @@
 import dayjs from 'dayjs';
 import { MongoClient } from 'mongodb';
 import { Decimal128, Double } from 'bson';
-import { IAdminForthDataSourceConnector, IAdminForthSingleFilter, IAdminForthAndOrFilter, AdminForthResource } from '../types/Back.js';
+import { IAdminForthDataSourceConnector, IAdminForthSingleFilter, IAdminForthAndOrFilter, AdminForthResource, IAggregationRule, IGroupByRule, IGroupByDateTrunc, IGroupByField } from '../types/Back.js';
 import AdminForthBaseConnector from './baseConnector.js';
 import { afLogger } from '../modules/logger.js';
 import { AdminForthDataTypes, AdminForthFilterOperators, AdminForthSortDirections, } from '../types/Common.js';
@@ -305,6 +305,108 @@ class MongoConnector extends AdminForthBaseConnector implements IAdminForthDataS
             .filter((f) => (f as IAdminForthSingleFilter).insecureRawSQL === undefined)
             .map((f) => this.getFilterQuery(resource, f)));
     }
+
+    async getAggregateWithOriginalTypes({ resource, filters, aggregations, groupBy }: {
+        resource: AdminForthResource;
+        filters: IAdminForthAndOrFilter;
+        aggregations: { [alias: string]: IAggregationRule };
+        groupBy?: IGroupByRule;
+    }): Promise<Array<{ group?: string, [key: string]: any }>> {
+
+        const collection = this.client.db().collection(resource.table);
+
+        const match = filters?.subFilters?.length ? this.getFilterQuery(resource, filters) : {};
+
+        let groupId: any = null;
+
+        if (groupBy?.type === 'field') {
+            const g = groupBy as IGroupByField;
+            groupId = `$${g.field}`;
+        }
+
+        if (groupBy?.type === 'date_trunc') {
+            const g = groupBy as IGroupByDateTrunc;
+            const tz = g.timezone ?? 'UTC';
+            const dateTruncSpec: any = { 
+                date: `$${g.field}`, 
+                unit: g.truncation, 
+                timezone: tz,
+            };
+            if (g.truncation === 'week') {
+                dateTruncSpec.startOfWeek = 'Mon';
+            }
+            groupId = { $dateTrunc: dateTruncSpec };
+        }
+
+        const groupStage: Record<string, any> = {
+            _id: groupId,
+        };
+
+        for (const [alias, rule] of Object.entries(aggregations)) {
+            switch (rule.operation) {
+                case 'count': groupStage[alias] = { $sum: 1 }; break;
+                case 'sum': groupStage[alias] = { $sum: { $toDouble: `$${rule.field}` } }; break;
+                case 'avg': groupStage[alias] = { $avg: { $toDouble: `$${rule.field}` } }; break;
+                case 'min': groupStage[alias] = { $min: { $toDouble: `$${rule.field}` } }; break;
+                case 'max': groupStage[alias] = { $max: { $toDouble: `$${rule.field}` } }; break;
+                case 'median': groupStage[alias] = { $push: { $toDouble: `$${rule.field}` } }; break;
+            }
+        }
+
+        const pipeline: any[] = [];
+
+        if (Object.keys(match).length) {
+            pipeline.push({ $match: match });
+        }
+
+        pipeline.push({ $group: groupStage });
+
+        pipeline.push({
+            $project: {
+                _id: 0,
+                group: !groupBy ? "$$REMOVE" : (groupBy.type === 'date_trunc' ? {
+                    $cond: {
+                        if: { $eq: [{ $type: "$_id" }, "date"] },
+                        then: { 
+                            $dateToString: { 
+                                format: "%Y-%m-%d", 
+                                date: "$_id", 
+                                timezone: (groupBy as IGroupByDateTrunc).timezone ?? 'UTC' 
+                            } 
+                        },
+                        else: "$_id"
+                    }
+                } : "$_id"),
+                ...Object.fromEntries(
+                    Object.keys(groupStage)
+                        .filter(k => k !== '_id')
+                        .map(k => [k, `$${k}`])
+                ),
+            },
+        });
+
+        const calculateMedian = (arr: any[]) => {
+            if (!Array.isArray(arr) || arr.length === 0) return null;
+            const sorted = [...arr].sort((a, b) => a - b);
+            const mid = Math.floor(sorted.length / 2);
+            return sorted.length % 2 === 0 
+                ? (sorted[mid - 1] + sorted[mid]) / 2 
+                : sorted[mid];
+        };
+
+        const result = await collection.aggregate(pipeline).toArray();
+
+        const medianAliases = Object.keys(aggregations).filter(
+            alias => aggregations[alias].operation === 'median'
+        );
+
+        return result.map(row => {
+            medianAliases.forEach(alias => {
+                row[alias] = calculateMedian(row[alias]);
+            });
+            return row;
+        });
+    }
 
     async getDataWithOriginalTypes({ resource, limit, offset, sort, filters }:
         { 

adminforth/dataConnectors/mysql.ts

@@ -1,5 +1,5 @@
 import dayjs from 'dayjs';
-import { AdminForthResource, IAdminForthSingleFilter, IAdminForthAndOrFilter, IAdminForthDataSourceConnector, AdminForthConfig } from '../types/Back.js';
+import { AdminForthResource, IAdminForthSingleFilter, IAdminForthAndOrFilter, IAdminForthDataSourceConnector, AdminForthConfig, IAggregationRule, IGroupByRule, IGroupByDateTrunc, IGroupByField } from '../types/Back.js';
 import { AdminForthDataTypes,  AdminForthFilterOperators, AdminForthSortDirections, } from '../types/Common.js';
 import AdminForthBaseConnector from './baseConnector.js';
 import mysql from 'mysql2/promise';
@@ -338,13 +338,128 @@ class MysqlConnector extends AdminForthBaseConnector implements IAdminForthDataS
     } : { sql: '', values: [] };
   }
 
+  async getAggregateWithOriginalTypes({ resource, filters, aggregations, groupBy }: {
+    resource: AdminForthResource;
+    filters: IAdminForthAndOrFilter;
+    aggregations: { [alias: string]: IAggregationRule };
+    groupBy?: IGroupByRule;
+  }): Promise<Array<{ group?: string, [key: string]: any }>> {
+    const tableName = resource.table;
+    const selectParts: string[] = [];
+    const medianFields: { alias: string; field: string }[] = [];
+    let groupExpr: string | null = null;
+
+    if (groupBy?.type === 'field') {
+      groupExpr = `\`${groupBy.field}\``;
+      selectParts.push(`${groupExpr} AS \`group\``);
+    } else if (groupBy?.type === 'date_trunc') {
+      const g = groupBy as IGroupByDateTrunc;
+      const tz = g.timezone ?? 'UTC';
+      if (!/^[A-Za-z0-9/_+\-]+$/.test(tz)) {
+        throw new Error(`Invalid timezone value: ${tz}`);
+      }
+      const innerExpr = `COALESCE(CONVERT_TZ(\`${g.field}\`, 'UTC', '${tz}'), \`${g.field}\`)`;
+      switch (g.truncation) {
+        case 'day':   groupExpr = `DATE_FORMAT(${innerExpr}, '%Y-%m-%d')`; break;
+        case 'month': groupExpr = `DATE_FORMAT(${innerExpr}, '%Y-%m-01')`; break;
+        case 'year':  groupExpr = `DATE_FORMAT(${innerExpr}, '%Y-01-01')`; break;
+        case 'week':  groupExpr = `DATE_FORMAT(DATE_SUB(${innerExpr}, INTERVAL WEEKDAY(${innerExpr}) DAY), '%Y-%m-%d')`; break;
+      }
+      selectParts.push(`${groupExpr} AS \`group\``);
+    }
+
+    for (const [alias, rule] of Object.entries(aggregations)) {
+      const f = `\`${rule.field}\``;
+      switch (rule.operation) {
+        case 'sum':    selectParts.push(`SUM(${f}) AS \`${alias}\``); break;
+        case 'count':  selectParts.push(`COUNT(*) AS \`${alias}\``); break;
+        case 'avg':    selectParts.push(`AVG(${f}) AS \`${alias}\``); break;
+        case 'min':    selectParts.push(`MIN(${f}) AS \`${alias}\``); break;
+        case 'max':    selectParts.push(`MAX(${f}) AS \`${alias}\``); break;
+        case 'median': medianFields.push({ alias, field: rule.field }); break;
+      }
+    }
+
+    const { sql: where, values: filterValues } = this.whereClauseAndValues(filters);
+
+    type AggRow = { group?: string } & Record<string, number | string | null>;
+
+    // Run non-median aggregations
+    let rows: AggRow[] = [];
+    const hasNonMedian = selectParts.length > (groupExpr ? 1 : 0);
+    if (hasNonMedian) {
+      let query = `SELECT ${selectParts.join(', ')} FROM \`${tableName}\` ${where}`;
+      if (groupExpr) query += ` GROUP BY ${groupExpr} ORDER BY ${groupExpr} ASC`;
+      dbLogger.trace(`🪲📜 MySQL AGG Q: ${query} values: ${JSON.stringify(filterValues)}`);
+      const [result] = await this.client.execute(query, filterValues);
+      rows = result as AggRow[];
+    }
+
+    // Run each median via window functions (MySQL 8+) — no session variables, no memory pressure
+    for (const { alias, field } of medianFields) {
+      const f = `\`${field}\``;
+      const nullGuard = where ? `${where} AND ${f} IS NOT NULL` : `WHERE ${f} IS NOT NULL`;
+
+      let medianQuery: string;
+      if (groupExpr) {
+        medianQuery = `
+          SELECT \`group\`, AVG(${f}) AS \`${alias}\`
+          FROM (
+            SELECT ${groupExpr} AS \`group\`, ${f},
+              ROW_NUMBER() OVER (PARTITION BY ${groupExpr} ORDER BY ${f}) AS rn,
+              COUNT(*) OVER (PARTITION BY ${groupExpr}) AS cnt
+            FROM \`${tableName}\` ${nullGuard}
+          ) t
+          WHERE rn IN (FLOOR((cnt + 1) / 2.0), CEIL((cnt + 1) / 2.0))
+          GROUP BY \`group\`
+          ORDER BY \`group\` ASC
+        `;
+      } else {
+        medianQuery = `
+          SELECT AVG(${f}) AS \`${alias}\`
+          FROM (
+            SELECT ${f},
+              ROW_NUMBER() OVER (ORDER BY ${f}) AS rn,
+              COUNT(*) OVER () AS cnt
+            FROM \`${tableName}\` ${nullGuard}
+          ) t
+          WHERE rn IN (FLOOR((cnt + 1) / 2.0), CEIL((cnt + 1) / 2.0))
+        `;
+      }
+
+      dbLogger.trace(`🪲📜 MySQL MEDIAN Q: ${medianQuery} values: ${JSON.stringify(filterValues)}`);
+      const [medianResult] = await this.client.execute(medianQuery, filterValues);
+      const medianRows = medianResult as AggRow[];
+
+      if (groupExpr) {
+        if (rows.length === 0) {
+          rows = medianRows.map((r) => ({ group: r.group, [alias]: r[alias] }));
+        } else {
+          const byGroup = new Map(medianRows.map((r) => [String(r.group), r[alias]]));
+          for (const row of rows) {
+            row[alias] = byGroup.get(String(row.group)) ?? null;
+          }
+        }
+      } else {
+        const medianVal = medianRows[0]?.[alias] ?? null;
+        if (rows.length === 0) {
+          rows = [{ [alias]: medianVal }];
+        } else {
+          rows[0][alias] = medianVal;
+        }
+      }
+    }
+
+    return rows;
+  }
+
   async getDataWithOriginalTypes({ resource, limit, offset, sort, filters }): Promise<any[]> {
-    const columns = resource.dataSourceColumns.map((col) => `${col.name}`).join(', ');
+    const columns = resource.dataSourceColumns.map((col: { name: string }) => `${col.name}`).join(', ');
     const tableName = resource.table;
 
     const { sql: where, values: filterValues } = this.whereClauseAndValues(filters);
 
-    const orderBy = sort.length ? `ORDER BY ${sort.map((s) => `${s.field} ${this.SortDirectionsMap[s.direction]}`).join(', ')}` : '';
+    const orderBy = sort.length ? `ORDER BY ${sort.map((s: { field: string; direction: AdminForthSortDirections }) => `${s.field} ${this.SortDirectionsMap[s.direction]}`).join(', ')}` : '';
     let selectQuery = `SELECT ${columns} FROM ${tableName}`;
     if (where) selectQuery += ` ${where}`;
     if (orderBy) selectQuery += ` ${orderBy}`;
@@ -385,7 +500,7 @@ class MysqlConnector extends AdminForthBaseConnector implements IAdminForthDataS
   async getMinMaxForColumnsWithOriginalTypes({ resource, columns }) {
     const tableName = resource.table;
     const result = {};
-    await Promise.all(columns.map(async (col) => {
+    await Promise.all(columns.map(async (col: { name: string }) => {
       const q = `SELECT MIN(${col.name}) as min, MAX(${col.name}) as max FROM ${tableName}`;
       dbLogger.trace(`🪲📜 MySQL Q: ${q}`);
       const [results] = await this.client.execute(q);
@@ -410,7 +525,7 @@ class MysqlConnector extends AdminForthBaseConnector implements IAdminForthDataS
 
   async updateRecordOriginalValues({ resource, recordId,  newValues }) {
     const values = [...Object.values(newValues), recordId];
-    const columnsWithPlaceholders = Object.keys(newValues).map((col, i) => `${col} = ?`).join(', ');
+    const columnsWithPlaceholders = Object.keys(newValues).map((col) => `${col} = ?`).join(', ');
     const q = `UPDATE ${resource.table} SET ${columnsWithPlaceholders} WHERE ${this.getPrimaryKey(resource)} = ?`;
     dbLogger.trace(`🪲📜 MySQL Q: ${q} values: ${JSON.stringify(values)}`);
     await this.client.execute(q, values);