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    Type:Improvement 
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    Resolution: Gone away
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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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        Query Optimization
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Sharded aggregations currently have different code paths for unsharded collections passthrough and pipelines which only target a single shard. Conceptually we shouldn't need to distinguish between the two cases to prepare for a world where unsharded collections are tracked in the config server.
- depends on
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                    SERVER-42942 M/R Agg: Implement translation for cluster mapReduce command -         
- Closed
 
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