> use banana
switched to db banana
> db.dropDatabase();
{ "dropped" : "banana", "ok" : 1 }
> use banana
switched to db banana
> db.c.ensureIndex({'name' : 1} )
> db.c.ensureIndex({'addresses.state' : 1} )
> db.c.insert({name: 'abcd', addresses: [{state:'OR'}, {state:'WA'}] });
> db.c.insert({name: 'qwer', addresses: [{state:'AZ'}, {state:'CA'}] });
> db.runCommand({ distinct: 'c', key: 'name'} )
{
        "values" : [
                "abcd",
                "qwer"
        ],
        "stats" : {
                "n" : 2,
                "nscanned" : 2,
                "nscannedObjects" : 0,
                "timems" : 0,
                "cursor" : "BtreeCursor name_1"
        },
        "ok" : 1
}

> db.runCommand({ distinct: 'c', key: 'addresses.state'} )
{
        "values" : [
                "OR",
                "WA",
                "AZ",
                "CA"
        ],
        "stats" : {
                "n" : 2,
                "nscanned" : 2,
                "nscannedObjects" : 2,
                "timems" : 0,
                "cursor" : "BasicCursor"
        },
        "ok" : 1
}

> db.c.find({'addresses.state':'CA'}).explain()
{
        "cursor" : "BtreeCursor addresses.state_1",
        "isMultiKey" : true,
        "n" : 1,
        "nscannedObjects" : 1,
        "nscanned" : 1,
        "nscannedObjectsAllPlans" : 1,
        "nscannedAllPlans" : 1,
        "scanAndOrder" : false,
        "indexOnly" : false,
        "nYields" : 0,
        "nChunkSkips" : 0,
        "millis" : 0,
        "indexBounds" : {
                "addresses.state" : [
                        [
                                "CA",
                                "CA"
                        ]
                ]
        },
        "server" : "dellm4500ws:27017"
}