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Computes an HLL hash of a value.

func.hll_hash(<expr>)
func.hll_hash('user_123')
┌───────┐
│ (hll) │
└───────┘
HLL_HASH(<expr>)
SELECT HLL_CARDINALITY(HLL_HASH('user_123'));
┌───┐
1
└───┘