

[jsTest] ----
[jsTest] Query: [ { "$match" : { "username" : "/^user8/" } }, { "$project" : { "username" : 1 } }, { "$group" : { "_id" : 1, "count" : { "$sum" : 1 } } } ]
[jsTest] ----


nReturned: 0
Plan skeleton: {
	"queryPlanner" : {
		"winningPlan" : {
			"optimizerPlan" : {
				"nodeType" : "Root",
				"child" : {
					"nodeType" : "Evaluation",
					"child" : {
						"nodeType" : "GroupBy",
						"child" : {
							"nodeType" : "Evaluation",
							"child" : {
								"nodeType" : "Filter",
								"child" : {
									"nodeType" : "PhysicalScan"
								}
							}
						}
					}
				}
			}
		}
	}
}

[jsTest] ----
[jsTest] Query: [ { "$match" : { "username" : "/^user8/" } }, { "$group" : { "_id" : 1, "count" : { "$sum" : 1 } } } ]
[jsTest] ----


nReturned: 0
Plan skeleton: {
	"queryPlanner" : {
		"winningPlan" : {
			"optimizerPlan" : {
				"nodeType" : "Root",
				"child" : {
					"nodeType" : "Evaluation",
					"child" : {
						"nodeType" : "GroupBy",
						"child" : {
							"nodeType" : "Evaluation",
							"child" : {
								"nodeType" : "Filter",
								"child" : {
									"nodeType" : "PhysicalScan"
								}
							}
						}
					}
				}
			}
		}
	}
}