HLL_HASH
description
Syntax
HLL_HASH(value)
HLL_HASH 将一个值转换为 hll 类型。通常用于导入数据时，将普通类型的值导入到 hll 列中。
example
MySQL > select HLL_CARDINALITY(HLL_HASH('abc'));
+----------------------------------+
| hll_cardinality(HLL_HASH('abc')) |
+----------------------------------+
| 1 |
+----------------------------------+keywords
HLL,HLL_HASH