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    Type:Improvement 
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    Resolution: Unresolved
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    Priority:Major - P3 
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    Affects Version/s: None
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    Component/s: None
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        Query Optimization
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Say we have a non-multikey index {x: 1, y: 1}
The query with filter {x: null, y: {$eq: 1}} and projection {_id: 0, y: 1} can be covered, since we never actually need to distinguish between x values
- is related to
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                    SERVER-18861 Queries matching null value should be fully covered by index -         
- Backlog
 
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- related to
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                    SERVER-18861 Queries matching null value should be fully covered by index -         
- Backlog
 
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