fix: add missing "comment" field to QB clone method (#7205)

Closes: #7203

Co-authored-by: Astrit Shehu <a.shehu@linkplus-ks.com>

src/query-builder/QueryExpressionMap.ts

@@ -434,6 +434,7 @@ export class QueryExpressionMap {
         map.callListeners = this.callListeners;
         map.useTransaction = this.useTransaction;
         map.nativeParameters = Object.assign({}, this.nativeParameters);
+        map.comment = this.comment;
         return map;
     }
 

test/github-issues/7203/issue-7203.ts

@@ -0,0 +1,23 @@
+import {closeTestingConnections, createTestingConnections, reloadTestingDatabases} from "../../utils/test-utils";
+import {Connection} from "../../../src/connection/Connection";
+import {expect} from "chai";
+
+describe("github issues > #7203 QueryExpressionMap doesn't clone comment field", () => {
+  let connections: Connection[];
+  before(
+    async () =>
+      (connections = await createTestingConnections({
+        dropSchema: true,
+        enabledDrivers: ["postgres"],
+      }))
+  );
+  beforeEach(() => reloadTestingDatabases(connections));
+  after(() => closeTestingConnections(connections));
+
+    it("should be able to clone comment field", () => Promise.all(connections.map(async connection => {
+        const comment = "a comment";
+        const queryBuilder = await connection.createQueryBuilder().comment(comment);
+        const clonedQueryBuilder = queryBuilder.clone();
+        expect(clonedQueryBuilder.expressionMap.comment).to.be.eq(comment);
+    })));
+});