为什么MongoDB会返回未过滤的结果？

Question

我正在对MongoDB表进行过滤查询，但结果与过滤条件不匹配。

我正在使用以下查询：

db.url_repository.find({"p":0,"pr":0}).limit(10)

但我的结果是

{ "_id" : ObjectId("568742bb60d99e329a115b7a"), "pr" : 0, "p" : 1, "u" : "http://www.blabla", "type" : "regular", "ct" : ISODate("2016-01-02T05:23:39.586Z"), "dt" : ISODate("2016-08-20T14:59:48.759Z") }
{ "_id" : ObjectId("568742bb60d99e329a115b7b"), "pr" : 0, "p" : 1, "u" : "http://www.blabla", "type" : "regular", "ct" : ISODate("2016-01-02T05:23:39.586Z"), "dt" : ISODate("2016-08-20T15:00:00.392Z") }
{ "_id" : ObjectId("568742bb60d99e329a115b7c"), "pr" : 0, "p" : 1, "u" : "http://www.blabla", "type" : "regular", "ct" : ISODate("2016-01-02T05:23:39.586Z"), "dt" : ISODate("2016-08-20T15:00:12.537Z") }
{ "_id" : ObjectId("568742bb60d99e329a115b7d"), "pr" : 0, "p" : 1, "u" : "http://www.blabla/", "type" : "regular", "ct" : ISODate("2016-01-02T05:23:39.587Z"), "dt" : ISODate("2016-08-20T15:00:15.887Z") }

正如您所看到的，它不符合规则，结果包括带有“p”的文档：1

这些结果在MongoDB shell上返回，但pymongo（Python库）也会返回正确的结果。我找不到可能的原因。

非常感谢您的支持。

编辑：explain（）结果也在

之下

{
        "queryPlanner" : {
                "plannerVersion" : 1,
                "namespace" : "crawlerdb.url_repository",
                "indexFilterSet" : false,
                "parsedQuery" : {
                        "$and" : [
                                {
                                        "p" : {
                                                "$eq" : 0
                                        }
                                },
                                {
                                        "pr" : {
                                                "$eq" : 0
                                        }
                                }
                        ]
                },
                "winningPlan" : {
                        "stage" : "LIMIT",
                        "limitAmount" : 10,
                        "inputStage" : {
                                "stage" : "FETCH",
                                "filter" : {
                                        "pr" : {
                                                "$eq" : 0
                                        }
                                },
                                "inputStage" : {
                                        "stage" : "IXSCAN",
                                        "keyPattern" : {
                                                "p" : 1
                                        },
                                        "indexName" : "is_processed",
                                        "isMultiKey" : false,
                                        "isUnique" : false,
                                        "isSparse" : false,
                                        "isPartial" : false,
                                        "indexVersion" : 1,
                                        "direction" : "forward",
                                        "indexBounds" : {
                                                "p" : [
                                                        "[0.0, 0.0]"
                                                ]
                                        }
                                }
                        }
                },
                "rejectedPlans" : [
                        {
                                "stage" : "LIMIT",
                                "limitAmount" : 10,
                                "inputStage" : {
                                        "stage" : "FETCH",
                                        "inputStage" : {
                                                "stage" : "IXSCAN",
                                                "keyPattern" : {
                                                        "p" : 1,
                                                        "pr" : -1
                                                },
                                                "indexName" : "url_is_processed_priority",
                                                "isMultiKey" : false,
                                                "isUnique" : false,
                                                "isSparse" : false,
                                                "isPartial" : false,
                                                "indexVersion" : 1,
                                                "direction" : "forward",
                                                "indexBounds" : {
                                                        "p" : [
                                                                "[0.0, 0.0]"
                                                        ],
                                                        "pr" : [
                                                                "[0.0, 0.0]"
                                                        ]
                                                }
                                        }
                                }
                        }
                ]
        },
        "serverInfo" : {
                "host" : "barcelona",
                "port" : 27017,
                "version" : "3.2.7",
                "gitVersion" : "4249c1d2b5999ebbf1fdf3bc0e0e3b3ff5c0aaf2"
        },
        "ok" : 1
}