Implement QueryService and QueryAnalyzer for Week 4

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/foundation/core/src/app.ts

@@ -58,7 +58,9 @@ export class ObjectQL implements IObjectQL {
         }
 
         // Add the ObjectQL plugin to provide enhanced features
-        this.kernelPlugins.push(new ObjectQLPlugin());
+        this.kernelPlugins.push(new ObjectQLPlugin({
+            datasources: this.datasources
+        }));
 
         // Add runtime plugins from config
         if (config.plugins) {

packages/foundation/core/src/plugin.ts

@@ -10,6 +10,17 @@ import type { RuntimePlugin, RuntimeContext } from '@objectstack/runtime';
 import type { ObjectStackKernel } from '@objectstack/runtime';
 import { ValidatorPlugin, ValidatorPluginConfig } from './validator-plugin';
 import { FormulaPlugin, FormulaPluginConfig } from './formula-plugin';
+import { QueryService } from './query/query-service';
+import { QueryAnalyzer } from './query/query-analyzer';
+import type { Driver } from '@objectql/types';
+
+/**
+ * Extended ObjectStack Kernel with ObjectQL services
+ */
+interface ExtendedKernel extends ObjectStackKernel {
+    queryService?: QueryService;
+    queryAnalyzer?: QueryAnalyzer;
+}
 
 /**
  * Configuration for the ObjectQL Plugin
@@ -50,6 +61,18 @@ export interface ObjectQLPluginConfig {
    * @default true
    */
   enableAI?: boolean;
+  
+  /**
+   * Enable query service and analyzer
+   * @default true
+   */
+  enableQueryService?: boolean;
+  
+  /**
+   * Datasources for query service
+   * Required if enableQueryService is true
+   */
+  datasources?: Record<string, Driver>;
 }
 
 /**
@@ -70,6 +93,7 @@ export class ObjectQLPlugin implements RuntimePlugin {
       enableValidator: true,
       enableFormulas: true,
       enableAI: true,
+      enableQueryService: true,
       ...config
     };
   }
@@ -81,6 +105,25 @@ export class ObjectQLPlugin implements RuntimePlugin {
   async install(ctx: RuntimeContext): Promise<void> {
     console.log(`[${this.name}] Installing plugin...`);
 
+    const kernel = ctx.engine as ExtendedKernel;
+    
+    // Register QueryService and QueryAnalyzer if enabled
+    if (this.config.enableQueryService !== false && this.config.datasources) {
+      const queryService = new QueryService(
+        this.config.datasources,
+        kernel.metadata
+      );
+      kernel.queryService = queryService;
+      
+      const queryAnalyzer = new QueryAnalyzer(
+        queryService,
+        kernel.metadata
+      );
+      kernel.queryAnalyzer = queryAnalyzer;
+      
+      console.log(`[${this.name}] QueryService and QueryAnalyzer registered`);
+    }
+    
     // Register components based on configuration
     if (this.config.enableRepository !== false) {
       await this.registerRepository(ctx.engine);

packages/foundation/core/src/query/index.ts

@@ -12,9 +12,13 @@
  * This module contains ObjectQL's query-specific functionality:
  * - FilterTranslator: Converts ObjectQL filters to ObjectStack FilterNode
  * - QueryBuilder: Builds ObjectStack QueryAST from ObjectQL UnifiedQuery
+ * - QueryService: Executes queries via drivers with profiling support
+ * - QueryAnalyzer: Provides query performance analysis and optimization suggestions
  * 
  * These are the core components that differentiate ObjectQL from generic runtime systems.
  */
 
 export * from './filter-translator';
 export * from './query-builder';
+export * from './query-service';
+export * from './query-analyzer';