"allPaths" indexes have a sparseness property by default, so the planning behavior is special for $exists:true, $exists:false, $eq:null, $ne:null, etc.
- depends on
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SERVER-35330 Enhance query planner's index selection code to support "allPaths" indexes
- Closed
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SERVER-35500 Extend IndexBoundsBuilder to implement special bounds generation for allPaths indexes
- Closed