fix(api-gateway): Fix member sql extraction in meta?extended

Author: bsod90

packages/cubejs-api-gateway/src/helpers/transformMetaExtended.ts

@@ -4,7 +4,7 @@ function stringifyMemberSql(sql?: () => string) {
   }
 
   const sqlStr = sql.toString();
-  return sqlStr.substring(sqlStr.indexOf('=>') + 3);
+  return sqlStr.substring(sqlStr.indexOf('=>') + 2).trim();
 }
 
 type MemberPath = {

packages/cubejs-api-gateway/test/helpers/transformMetaExtended.test.ts

@@ -162,6 +162,42 @@ describe('transformMetaExtended helpers', () => {
     expect(handledCube).toHaveProperty('dimensions');
   });
 
+  test('transformCube - extends field preservation', () => {
+    // Test cases from the reported bug: extends field missing first letter
+    const mockCubeDefinitions = {
+      AncillaryReview: { extends: () => 'AncillaryReview' },
+      Agreement: { extends: () => 'Agreement' },
+      ApiProjectRisk: { extends: () => 'ApiProjectRisk' },
+      Disclosure: { extends: () => 'Disclosure' },
+      Certification: { extends: () => 'Certification' }
+    };
+
+    const mockCubes = [
+      { name: 'AncillaryReview' },
+      { name: 'Agreement' },
+      { name: 'ApiProjectRisk' },
+      { name: 'Disclosure' },
+      { name: 'Certification' }
+    ];
+
+    mockCubes.forEach(cube => {
+      const transformedCube = transformCube(cube, mockCubeDefinitions);
+      expect(transformedCube).toBeDefined();
+      expect(transformedCube.extends).toBe(`"${cube.name}"`);
+      // Verify the first letter is not truncated
+      expect(transformedCube.extends).not.toBe(`"${cube.name.substring(1)}"`);
+    });
+
+    // Specific test for the reported examples
+    const ancillaryReviewCube = transformCube({ name: 'AncillaryReview' }, mockCubeDefinitions);
+    expect(ancillaryReviewCube.extends).toBe('"AncillaryReview"');
+    expect(ancillaryReviewCube.extends).not.toBe('"ncillaryReview"'); // Should not be truncated
+
+    const agreementCube = transformCube({ name: 'Agreement' }, mockCubeDefinitions);
+    expect(agreementCube.extends).toBe('"Agreement"');
+    expect(agreementCube.extends).not.toBe('"greement"'); // Should not be truncated
+  });
+
   test('transformDimension', () => {
     const handledDimension = transformDimension(MOCK_USERS_CUBE.dimensions.id, MOCK_USERS_CUBE);
     expect(handledDimension).toBeDefined();