9 HyperLogLog Commands

procedure
(redis-hll-add! client key value ...+) → boolean?
  client : redis?
  key : redis-key/c
  value : redis-string/c

Adds all the values to the HyperLogLog struct at key.

Commands used by this function: PFADD

procedure
(redis-hll-count client key ...+) → exact-nonnegative-integer?
client : redis?
key : redis-key/c

Returns the approximate cardinality of the union of the given HyperLogLog structs at each key.

Commands used by this function: PFCOUNT

procedure
(redis-hll-merge! client dest key ...+) → boolean?
  client : redis?
  dest : redis-key/c
  key : redis-key/c

Writes the union of the given HyperLogLog structs at each key into the dest key.

Commands used by this function: PFMERGE