Use hyperloglog sketch for NDV estimates

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    • Type: Task
    • Resolution: Unresolved
    • Priority: Major - P3
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    • Query Optimization
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      Similar to tracking the number of documents in a collection, we can build a hyperloglog sketch and attach it to index metadata which would allow to use a quick heuristics CE to estimate a number of distinct values for a path. Thanks steve.tarzia@mongodb.com for the idea!

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            Reporter:
            Anton Korshunov
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