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Type:
Improvement
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Resolution: Fixed
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Priority:
Major - P3
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None
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Affects Version/s: 4.2.0-rc2
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Component/s: None
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None
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Query Execution
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Fully Compatible
Normal update operation in shows up in oplog (changestream) as operationType update, while update with aggregation pipeline shows up in oplog (changestream) as operationType replace.
Example:
db.test.update({a:1}, {$set:{b:"foo"}})
Output:
{ '_id': { '_data': '...'},
'clusterTime': Timestamp(1562633420, 1),
'documentKey': {'_id': ObjectId('5d1ede84705cbd6a35d69fcf')},
'ns': {'coll': 'test', 'db': 'test'},
'operationType': 'update',
'updateDescription': {'removedFields': [], 'updatedFields': {'b': 'foo'}}}
While update with aggregation:
db.test.update({a:1}, [{$set:{b:"bar"}}])
Output:
{ '_id': { '_data': '...'},
'clusterTime': Timestamp(1562633424, 1),
'documentKey': {'_id': ObjectId('5d1ede84705cbd6a35d69fcf')},
'fullDocument': { '_id': ObjectId('5d1ede84705cbd6a35d69fcf'),
'a': 1.0,
'b': 'bar'},
'ns': {'coll': 'test', 'db': 'test'},
'operationType': 'replace'}
Would this behaviour likely to be changed in the future ?