HyperLogLog

📄️ PFADDAdds elements to a HyperLogLog key. Creates the key if it doesn’t exist

📄️ PFCOUNTReturns the approximated cardinality of the set(s) observed by the HyperLogLog key(s).

📄️ PFMERGEMerges one or more HyperLogLog values into a single key.