HLL_CARDINALITY

description

Syntax

HLL_CARDINALITY(hll)

HLL_CARDINALITY 用于计算 HLL 类型值的基数。

example

1. MySQL > select HLL_CARDINALITY(uv_set) from test_uv;
2. +---------------------------+
3. | hll_cardinality(`uv_set`) |
4. +---------------------------+
5. |                         3 |
6. +---------------------------+

keywords

HLL,HLL_CARDINALITY