array_of_doubles        Array of Doubles (Tuple) sketch for estimating
                        sums alongside distinct counts
array_of_doubles_set_operations
                        Array of Doubles sketch set operations
bloom_filter            Bloom filter for approximate set membership
bloom_filter_suggest    Suggest Bloom filter sizing parameters
count_min               Count-Min sketch for approximate
                        point-frequency estimation
count_min_suggest       Suggest Count-Min sketch parameters
cpc                     CPC sketch for approximate distinct counting
ebpps                   EBPPS sketch for proportional-to-size sampling
frequent_items          Frequent Items sketch for approximate frequency
                        estimation
hll                     HLL sketch for approximate distinct counting
kll_doubles             KLL sketch for approximate quantiles of a
                        numeric stream
kll_floats              KLL sketch for approximate quantiles of a
                        numeric stream stored as floats
req                     REQ sketch for relative-error approximate
                        quantiles of a numeric stream
tdigest_double          t-Digest sketch for approximate quantiles of a
                        numeric stream
theta                   Theta sketch for approximate distinct counting
                        and set operations
theta_set_operations    Theta sketch set operations
varopt                  VarOpt sketch for variance-optimal sampling and
                        subset-sum estimation
varopt_union            Combine two VarOpt sketches
