XXHASH_32

Description

Calculate the 32-bit xxhash value of the input string or binary.

-Note: When calculating hash values, it is recommended to use xxhash_32 instead of murmur_hash3_32.

Syntax

XXHASH_32( <input> [ , <input> ... ] )

Parameters

parameter	description
<input>	The 32-bit xxhash value to be calculated, accept string and binary types

Return Value

Returns the 32-bit xxhash value of the input string.

Examples

select xxhash_32(NULL), xxhash_32("hello"), xxhash_32("hello", "world");

+-----------------+--------------------+-----------------------------+
| xxhash_32(NULL) | xxhash_32('hello') | xxhash_32('hello', 'world') |
+-----------------+--------------------+-----------------------------+
|            NULL |          -83855367 |                  -920844969 |
+-----------------+--------------------+-----------------------------+

-- vb (VarBinary) and vc (VarChar) used the same string during insertion.
SELECT * FROM mysql_catalog.binary_test.binary_test;

+------+------------+------+
| id   | vb         | vc   |
+------+------------+------+
|    1 | 0x616263   | abc  |
|    2 | 0x78797A   | xyz  |
|    3 | NULL       | NULL |
+------+------------+------+

SELECT XXHASH_32(vb), XXHASH_32(vc) FROM mysql_catalog.binary_test.binary_test;

+---------------+---------------+
| XXHASH_32(vb) | XXHASH_32(vc) |
+---------------+---------------+
|     852579327 |     852579327 |
|    -242012205 |    -242012205 |
|          NULL |          NULL |
+---------------+---------------+