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Devuelve un recuento aproximado de valores distintos mediante HyperLogLog.

func.approx_count_distinct(get_column(table, 'user_id'))
func.approx_count_distinct(get_column(table, 'user_id'))
┌─────┐
│ 985 │
└─────┘
APPROX_COUNT_DISTINCT(<user_id>)
SELECT APPROX_COUNT_DISTINCT(user_id) FROM page_views;
┌─────┐
│ 985 │
└─────┘