Trino Functions
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
empty_approx_set
Returns an empty HyperLogLog.
Supported Signatures
function empty_approx_set() returns hyperloglog
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