hll_cardinality

计算单个 HLL 类型值的基数。

语法

HLL_CARDINALITY(hll)

示例

MySQL > select HLL_CARDINALITY(uv_set) from test_uv;
+---------------------------+
| hll_cardinality(`uv_set`) |
+---------------------------+
|                         3 |
+---------------------------+

关键词

HLL,HLL_CARDINALITY