There are several schemas for how queries with/without sort are stored in system.profile. This makes it unnecessarily complex to run aggregation over system.profile collections that access the query patterns.

There should be a single common format for all queries.

simple find, no sort : query on top level

db.docs.find({a: 1})

	"query" : {
		"a" : 1
	},

find with sort, query is nested in another query field, without $.

db.docs.find({a: 1}).sort({b:1})

	"query" : {
		"query" : {
			"a" : 1
		},
		"orderby" : {
			"b" : 1
		}
	},

$query / $orderby syntax, results in nested $query field with $.

db.docs.find({ $query: {a: 1}, $orderby: {b: 1} })

	"query" : {
		"$query" : {
			"a" : 1
		},
		"$orderby" : {
			"b" : 1
		}
	},