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Type: Improvement
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Resolution: Done
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Priority: Major - P3
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Affects Version/s: None
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Component/s: Aggregation Framework
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Labels:None
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Fully Compatible
Aliases implement various aggregation stages. Some, like $bucket and $count, are implemented as two successive stages, while others, like $project, $addFields, and $replaceRoot are implemented as cases of the SingleDocumentTransformation stage. These cases can be registered as regular document sources, so that their createFromBson constructors return a pointer.