hll_cardinality

単一の HLL 型の値の基数を計算します。

Syntax

HLL_CARDINALITY(hll)

Examples

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

keyword

HLL,HLL_CARDINALITY