Hamming distance in SQL on binary string types (but if it works it'll work on whatever data; I am 97% sure this is PostrgeSQL [but not PGPL-SQL])

hamming-distance-on-binary-strings-in-SQL.sql

SELECT * FROM table 
  ORDER BY HAMMINGDISTANCE(hash, UNHEX(<insert supplied sha256 hash here>)) ASC 
  LIMIT 10
	
CREATE FUNCTION HAMMINGDISTANCE(
  A0 BIGINT, A1 BIGINT, A2 BIGINT, A3 BIGINT, 
  B0 BIGINT, B1 BIGINT, B2 BIGINT, B3 BIGINT
)
RETURNS INT DETERMINISTIC
RETURN 
  BIT_COUNT(A0 ^ B0) +
  BIT_COUNT(A1 ^ B1) +
  BIT_COUNT(A2 ^ B2) +
  BIT_COUNT(A3 ^ B3);
	
CREATE FUNCTION HAMMINGDISTANCE(A BINARY(32), B BINARY(32))
RETURNS INT DETERMINISTIC
RETURN 
  BIT_COUNT(
    CONV(HEX(SUBSTRING(A, 1,  8)), 16, 10) ^ 
    CONV(HEX(SUBSTRING(B, 1,  8)), 16, 10)
  ) +
  BIT_COUNT(
    CONV(HEX(SUBSTRING(A, 9,  8)), 16, 10) ^ 
    CONV(HEX(SUBSTRING(B, 9,  8)), 16, 10)
  ) +
  BIT_COUNT(
    CONV(HEX(SUBSTRING(A, 17, 8)), 16, 10) ^ 
    CONV(HEX(SUBSTRING(B, 17, 8)), 16, 10)
  ) +
  BIT_COUNT(
    CONV(HEX(SUBSTRING(A, 25, 8)), 16, 10) ^ 
    CONV(HEX(SUBSTRING(B, 25, 8)), 16, 10)
  );
	
drop table if exists BinaryTest;
create table  BinaryTest (hash binary(3));
insert BinaryTest values (0xAAAAAA);

set @supplied = cast(0x888888 as binary);

select  length(replace(concat(
            bin(ascii(substr(hash,1,1)) ^ ascii(substr(@supplied,1,1))),
            bin(ascii(substr(hash,2,1)) ^ ascii(substr(@supplied,2,1))),
            bin(ascii(substr(hash,3,1)) ^ ascii(substr(@supplied,3,1)))
        ),'0',''))
from    BinaryTest;
	
0xAAAAAA ^ 0x888888 = 0x222222 = 0b1000100010001000100010