DS_HLL_COUNT_DISTINCT (Lakehouse v2)

Renvoie un nombre distinct approximatif à l’aide de l’algorithme HLL de DataSketches. Plus précise que APPROX_COUNT_DISTINCT.

Syntaxe Analyze

func.ds_hll_count_distinct(get_column(table, 'user_id'))

Exemples Analyze

func.ds_hll_count_distinct(get_column(table, 'user_id'))

┌───────┐
│ 10042 │
└───────┘

Syntaxe SQL

DS_HLL_COUNT_DISTINCT(<expr>)

Exemples SQL

SELECT DS_HLL_COUNT_DISTINCT(user_id) FROM page_views;

┌───────┐
│ 10042 │
└───────┘