add jira ticket to singlestore-common.ts

integration-tests/tests/singlestore/singlestore-common.ts

@@ -2400,6 +2400,7 @@ export function tests(driver?: string) {
 			await db.execute(sql`drop table if exists \`datestable\``);
 		});
 
+		// TODO (https://memsql.atlassian.net/browse/MCDB-63261) allow chaining limit and orderby in subquery
 		test('set operations (union) from query builder with subquery', async (ctx) => {
 			const { db } = ctx.singlestore;