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// SERVER-6179: support for two $groups in sharded agg
(function() {
var s = new ShardingTest({name: "aggregation_multiple_group", shards: 2, mongos: 1});
s.stopBalancer();
s.adminCommand({enablesharding: "test"});
s.ensurePrimaryShard('test', 'shard0001');
s.adminCommand({shardcollection: "test.data", key: {_id: 1}});
var d = s.getDB("test");
// Insert _id values 0 - 99
var N = 100;
var bulkOp = d.data.initializeOrderedBulkOp();
for (var i = 0; i < N; ++i) {
bulkOp.insert({_id: i, i: i % 10});
}
bulkOp.execute();
// Split the data into 3 chunks
s.adminCommand({split: "test.data", middle: {_id: 33}});
s.adminCommand({split: "test.data", middle: {_id: 66}});
// Migrate the middle chunk to another shard
s.adminCommand(
{movechunk: "test.data", find: {_id: 50}, to: s.getOther(s.getPrimaryShard("test")).name});
// Check that we get results rather than an error
var result = d.data
.aggregate({$group: {_id: '$_id', i: {$first: '$i'}}},
{$group: {_id: '$i', avg_id: {$avg: '$_id'}}},
{$sort: {_id: 1}})
.toArray();
expected = [
{"_id": 0, "avg_id": 45},
{"_id": 1, "avg_id": 46},
{"_id": 2, "avg_id": 47},
{"_id": 3, "avg_id": 48},
{"_id": 4, "avg_id": 49},
{"_id": 5, "avg_id": 50},
{"_id": 6, "avg_id": 51},
{"_id": 7, "avg_id": 52},
{"_id": 8, "avg_id": 53},
{"_id": 9, "avg_id": 54}
];
assert.eq(result, expected);
s.stop();
})();
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