Mongodb地理空间索引不支持$box? [英] Mongodb Geospatial index does not support $box?

问题描述

我正在创建一个 2dsphere 索引并尝试将其用于我的地理空间查询.但是，我发现当我使用 $geoWithin.$box 时，它不使用索引，因此非常慢.如果我使用 $geoWithin.$geometry，则将使用索引.document 说 $box 支持索引，所以我必须想念一些东西.有什么想法吗?

I am creating a 2dsphere index and trying to utilize it for my geospatial queries. However, I find when I use $geoWithin.$box, it does not use the index, hence, very slow. If I use $geoWithin.$geometry, then the index will be used. The document says $box supports index, so I must be miss something. Any idea?

    {
            "v" : 1,
            "key" : {
                    "details.lonlat" : "2dsphere"
            },
            "name" : "longlat",
            "ns" : "realestate.property",
            "2dsphereIndexVersion" : 2
    }

使用 GeoJSON 多边形查询使用索引

> db.property.find({'details.lonlat': {'$geoWithin': {$geometry: {type:'Polygon', coordinates: [[[1,1],[2,2],[3,3], [1,1]]]}}}}).explain()

"inputStage" : {
                                        "stage" : "IXSCAN",
                                        "keyPattern" : {
                                                "details.lonlat" : "2dsphere"
                                        },
...

使用 $box 不使用索引，而是使用集合扫描(为什么?)

> db.property.find({'details.lonlat': {'$geoWithin': {'$box': [[ 0, 0 ], [ 100, 100 ] ]}}}).explain()
            "winningPlan" : {
                    "stage" : "COLLSCAN",
                    "filter" : {
                            "details.lonlat" : {
                                    "$geoWithin" : {
                                            "$box" : [
                                                    [
                                                            0,
                                                            0
                                                    ],
                                                    [
                                                            100,
                                                            100
                                                    ]
                                            ]
                                    }
                            }
                    },
                    "direction" : "forward"

Mongodb 信息

            "version" : "3.0.4",
            "gitVersion" : "0481c958daeb2969800511e7475dc66986fa9ed5"

推荐答案

2dsphere 不支持 $box 查询.这就是为什么您的查询属于完整集合扫描的原因.

The 2dsphere does not support $box query. That's why your query falls to a full collection scan.

框文档声明如下:>

The box documentation states the following:

Only the 2d geospatial index supports $box

添加 2d 索引应该可以解决问题，例如:

Adding a 2d index should do the trick, something like:

db.property.ensureIndex({"details.lonlat": "2d"});

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