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// test $size
load('jstests/aggregation/extras/utils.js');
c = db.server4899;
c.drop();
c.save({arr:[]});
c.save({arr:[1]});
c.save({arr:["asdf", "asdfasdf"]});
c.save({arr:[1, "asdf", 1234, 4.3, {key:23}]});
c.save({arr:[3, [31, 31, 13, 13]]});
result = c.aggregate({$project: {_id: 0, length: {$size: "$arr"}}});
assert.eq(result.toArray(), [{length:0},
{length:1},
{length:2},
{length:5},
{length:2}]);
c.save({arr:231});
assertErrorCode(c, {$project: {_id: 0, length: {$size: "$arr"}}}, 17124);
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