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geofirestore是否会检索所有文档？

[英]Does geofirestore retrieves all documents?

原文 2019-07-09 05:04:17 4 1 javascript/ google-cloud-firestore/ geofirestore

I have users collection in Firestore each document of which has the format { d: <obj>, g: <str: geohash>, l: <GeoPoint> } , and I use geofirestore-js on my client app to perform a Nearby Search, and it's been working great. 我在Firestore中有一个users集合，每个文档的格式为{ d: <obj>, g: <str: geohash>, l: <GeoPoint> } ，我在客户端应用程序上使用geofirestore-js来执行附近搜索，而且效果很好。
However, I wonder if geofirestore-js retrieves all the documents from users beforehand behind the scenes, and performs the calculation to narrow down the result. 但是，我不知道geofirestore-js是否在幕后预先从users 那里检索了所有文档，并执行计算以缩小结果范围。
The reason I'm asking is that, according to Firebase official document , it is NOT the number of API calls, but number of documents which counts. 我要问的原因是，根据Firebase官方文档，不是API调用的数量，而是文档数量。 Or, does the library magically narrow down the result on the server side? 或者，该库是否神奇地缩小了服务器端的结果？

1 个解决方案

It does not read all the documents. 它不会阅读所有文档。 That wouldn't scale at all. 那根本无法扩展。 Geo queries use a special encoding that can be efficiently queried to find only the documents that match. 地理查询使用一种特殊的编码，可以有效地查询该编码以仅查找匹配的文档。

It even says on the GitHub page : 它甚至在GitHub页面上说：

GeoFirestore selectively loads only the data near certain locations, keeping your applications light and responsive, even with extremely large datasets. GeoFirestore仅在特定位置附近有选择地加载数据，即使您的数据集非常大，也可以保持应用程序的轻便和响应。