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

1. MySQL > select HLL_CARDINALITY(HLL_HASH('abc'));
2. +----------------------------------+
3. | hll_cardinality(HLL_HASH('abc')) |
4. +----------------------------------+
5. |                                1 |
6. +----------------------------------+

keywords

HLL,HLL_HASH