我有一個content從 Firebase 實時數據庫中檢索到的節點。我利用它.orderByChild("time")來獲取按最早時間戳排序的前 5 個博客對象的數據快照。我我目前正在嘗試使用.indexOn : "time"，這樣我就不必使用了，.orderByChild("time")因為我期望博客對象在檢索時已經按后端的時間戳排序。（我將要處理大量的博客對象，所以我想.indexOn : "time"在后端而不是orderByChild("time")在前端使用以提高效率）。目前，.indexOn不起作用，并且數據在檢索時未按其時間字段排序。查詢無.indexOn// this works fine// startAt is utilized for saving last blog object retrieved to retrieve more dataquery = FirebaseDatabase.getInstance().getReference()                .child("content")                .orderByChild("time")                .startAt(nodeId)                .limitToFirst(5);使用 .indexOn 查詢// this along with the Firebase rules below does not return the same result as above// startAt is utilized for saving last blog object retrieved to retrieve more dataquery = FirebaseDatabase.getInstance().getReference()                .child("content")                .startAt(nodeId)                .limitToFirst(5);火力地堡規則：{ "rules": { ".read": true, ".write": true, "content" : {      ".indexOn": "time"  } }}Firebase 中數據的 JSON 結構："content" : {"blog-0001" : {  "content_id" : "blog-0001",  "image" : "someimage",  "time" : 13,  "title" : "title1",  "type" : "blog"},"blog-0002" : {  "content_id" : "blog-0002",  "image" : "someimage",  "time" : 12,  "title" : "title2",  "type" : "blog"},"blog-0003" : {  "content_id" : "blog-0003",  "image" : "someimage",  "time" : 11,  "title" : "title3",  "type" : "blog"},"blog-0004" : {  "content_id" : "blog-0004",  "image" : "someimage",  "time" : 15,  "title" : "title4",  "type" : "blog"}...}