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Question

JSON结构：

{
    "order_queue": [{
        "status": "open",
        "time_order_placed": 1530283935281
    }, {
        "status": "id2",
        "time_order_placed": 1530283935291
    }, {
        "status": "open",
        "time_order_placed": 1530283935292
    }, {
        "status": "id1",
        "time_order_placed": 1530283935293
    }]
}

我现在可以做什么：我可以通过设置以下规则来查询orderByVal()上的time_order_placed：

"order_queue":{
        ".indexOn":"time_order_placed"
      }

问题：在按time_order_placed按值排序后，如何使快照仅返回status :"open"的订单？使用Firebase管理员在节点中编码。