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Calculates an xxHash64 64-bit hash value for a string. The value is returned as a UInt64 or NULL if the argument was NULL.

func.xxhash64(<expr>)
func.xxhash64('1234567890')
┌─────────────────────────────┐
│ func.xxhash64('1234567890') │
├─────────────────────────────┤
│ 12237639266330420150 │
└─────────────────────────────┘
XXHASH64(<expr>)
SELECT XXHASH64('1234567890');
┌────────────────────────┐
│ xxhash64('1234567890') │
├────────────────────────┤
│ 12237639266330420150 │
└────────────────────────┘