{
	"op" : "command",
	"ns" : "test.coll",
	"command" : {
		"group" : {
			"key" : {
				"a" : 1,
				"b" : 1
			},
			"cond" : {
				"b" : 3
			},
			"initial" : {
				
			},
			"ns" : "coll",
			"$reduce" : {
				"code" : "function () {}"
			}
		}
	},
	"keysExamined" : 2,
	"docsExamined" : 2,
	"numYield" : 1,
	"locks" : {
		"Global" : {
			"acquireCount" : {
				"r" : NumberLong(6)
			}
		},
		"Database" : {
			"acquireCount" : {
				"r" : NumberLong(3)
			}
		},
		"Collection" : {
			"acquireCount" : {
				"r" : NumberLong(3)
			}
		}
	},
	"responseLength" : 124,
	"protocol" : "op_command",
	"millis" : 31,
	"planSummary" : "IXSCAN { b: -1 }",
	"execStats" : {
		"stage" : "GROUP",
		"nReturned" : 1,
		"executionTimeMillisEstimate" : 31,
		"works" : 4,
		"advanced" : 1,
		"needTime" : 3,
		"needYield" : 0,
		"saveState" : 1,
		"restoreState" : 1,
		"isEOF" : 1,
		"invalidates" : 0,
		"nGroups" : 2,
		"inputStage" : {
			"stage" : "FETCH",
			"nReturned" : 2,
			"executionTimeMillisEstimate" : 0,
			"works" : 3,
			"advanced" : 2,
			"needTime" : 0,
			"needYield" : 0,
			"saveState" : 1,
			"restoreState" : 1,
			"isEOF" : 1,
			"invalidates" : 0,
			"docsExamined" : 2,
			"alreadyHasObj" : 0,
			"inputStage" : {
				"stage" : "IXSCAN",
				"nReturned" : 2,
				"executionTimeMillisEstimate" : 0,
				"works" : 3,
				"advanced" : 2,
				"needTime" : 0,
				"needYield" : 0,
				"saveState" : 1,
				"restoreState" : 1,
				"isEOF" : 1,
				"invalidates" : 0,
				"keyPattern" : {
					"b" : -1
				},
				"indexName" : "b_-1",
				"isMultiKey" : false,
				"multiKeyPaths" : {
					"b" : [ ]
				},
				"isUnique" : false,
				"isSparse" : false,
				"isPartial" : false,
				"indexVersion" : 2,
				"direction" : "forward",
				"indexBounds" : {
					"b" : [
						"[3.0, 3.0]"
					]
				},
				"keysExamined" : 2,
				"seeks" : 1,
				"dupsTested" : 0,
				"dupsDropped" : 0,
				"seenInvalidated" : 0
			}
		}
	},
	"ts" : ISODate("2017-10-15T01:54:45.500Z"),
	"client" : "127.0.0.1",
	"appName" : "MongoDB Shell",
	"allUsers" : [ ],
	"user" : ""
}
