| crc32(expr) | Returns a cyclic redundancy check value of the `expr` as a bigint. | 
    
      | hash(expr1, expr2, ...) | Returns a hash value of the arguments. | 
    
      | md5(expr) | Returns an MD5 128-bit checksum as a hex string of `expr`. | 
    
      | sha(expr) | Returns a sha1 hash value as a hex string of the `expr`. | 
    
      | sha1(expr) | Returns a sha1 hash value as a hex string of the `expr`. | 
    
      | sha2(expr, bitLength) | Returns a checksum of SHA-2 family as a hex string of `expr`.
      SHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit length of 0 is equivalent to 256. | 
    
      | xxhash64(expr1, expr2, ...) | Returns a 64-bit hash value of the arguments. Hash seed is 42. |