ClickHouse/tests/queries/0_stateless/01017_bithamming_distance.sql

SELECT bitHammingDistance(1, 5);
SELECT bitHammingDistance(100, 100000);
SELECT bitHammingDistance(-1, 1);

DROP TABLE IF EXISTS defaults;
CREATE TABLE defaults
(
	n1 UInt8,
	n2 UInt16,
	n3 UInt32,
	n4 UInt64
)ENGINE = Memory();

INSERT INTO defaults VALUES (1, 2, 3, 4) (12, 4345, 435, 1233) (45, 675, 32343, 54566) (90, 784, 9034, 778752);

SELECT bitHammingDistance(4, n1) FROM defaults;
SELECT bitHammingDistance(n2, 100) FROM defaults;
SELECT bitHammingDistance(n3, n4) FROM defaults;

DROP TABLE defaults;

DROP TABLE IF EXISTS test_string;

CREATE TABLE test_string
(
	s1 String,
	s2 String,
	s3 FixedString(10),
	s4 FixedString(10),
) ENGINE = Memory;

INSERT INTO test_string VALUES ('hello', 'hello', 'hello', 'hello') ('hello', 'hellow', 'hello', 'hellow') ('clickhouse', '012345', 'clickhouse', '012345');

SELECT bitHammingDistance('hello', 'hello');
SELECT bitHammingDistance('hello', 'hellow');
SELECT bitHammingDistance(toFixedString('hello', 6), toFixedString('hellow', 6));

SELECT bitHammingDistance(s1, s2) FROM test_string;
SELECT bitHammingDistance(s3, s4) FROM test_string;

SELECT bitHammingDistance('hello', s2) FROM test_string;
SELECT bitHammingDistance(s4, toFixedString('hello', 10)) FROM test_string;

DROP TABLE test_string;