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Add a variant of cuckoo filters in which buckets may overlap. #33

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Commits on May 6, 2018

  1. Add a variant of cuckoo filters in which buckets may overlap.

    This demonstrates lookup times that are as good as cuckoo filter
    lookup times, or better, while having space usage close to that of the
    semi-sorted cuckoo filter.
    
    This is based on Lehman, Eric, and Rina Panigrahy. "3.5-way cuckoo
    hashing for the price of 2-and-a-bit." European Symposium on
    Algorithms. Springer, Berlin, Heidelberg, 2009.
    jbapple-cloudera committed May 6, 2018
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