Hyperloglog Functions

approx_set

Returns the HyperLogLog sketch of the input data set of x. This data sketch underlies approx_distinct() and can be stored and used later by calling cardinality().

Supported Signatures

function approx_set(bigint) returns hyperloglog
function approx_set(double) returns hyperloglog
function approx_set(varchar) returns hyperloglog

🔗 Official Documentation

empty_approx_set

Returns an empty HyperLogLog.

Supported Signatures

function empty_approx_set() returns hyperloglog

🔗 Official Documentation

merge

Returns the HyperLogLog of the aggregate union of the individual hll HyperLogLog structures.

Supported Signatures

function merge(hyperloglog) returns hyperloglog
function merge(qdigest) returns qdigest
function merge(tdigest) returns tdigest

🔗 Official Documentation