count_distinct

Description

Estimate the approximate number of distinct values in the input using hyper-log-log.

(This is less precise, but faster than count_distinct_exact).

Return type

int64

Domain

This is an aggregate function (aggregates rows over a group in aggregate verbs.)

This is a window function (calculates over a group of multiple input rows using windowing.)

Categories

Usage

count_distinct(item_1, item_2, ...)

Argument

Type

Optional

Repeatable

Restrictions

item

storable

no

yes

none

Aliases

countdistinct (deprecated)