客户端 采用unicloud 的getTemp()方式死掉

我在客户端查询uni-id-users表的username重复记录
const db = uniCloud.databaseForJQL();
const dbCollectionName = 'uni-id-users';

let repetitionData = db.collection(dbCollectionName)
.groupBy("username").groupField("sum(1) as num").getTemp();

let res = await db.collection(repetitionData).where("num>1").get();

运行let res = await db.collection(repetitionData).where("num>1").get(); 时死掉，请问是什么原因，谢谢