HLL_CARDINALITY
description
Syntax
HLL_CARDINALITY(hll)
HLL_CARDINALITY 用于计算 HLL 类型值的基数。
example
MySQL > select HLL_CARDINALITY(uv_set) from test_uv;
+---------------------------+
| hll_cardinality(`uv_set`) |
+---------------------------+
| 3 |
+---------------------------+keywords
HLL,HLL_CARDINALITY