mysql - Why does MariaDB-10.2.8 UNHEX() return NULL? -


i have sql script works on mysql (up current versions). built copy of mariadb-10.2.8 source on linux machine , got database , running. however, sql script fails, because mariadb returning null unhex() call, shouldn't.

the call producing 20-byte random binary string in particular format (it's bittorrent node id). concatenate required bytes random bytes, bytes being limited particular range of values. these constructed 40-character hex string, run through unhex().

the sql is:

    unhex( concat( '414c2',               hex( 8 + round( rand() * 7 ) ),               substr( sha( uuid( ) ), 6, 33 ),               hex( 2 + round( rand( ) ) * 8 ) ) )

if take off unhex() function, 40-character hex string:

mariadb [bt]> select concat('414c2', hex(8+round(rand()*7)),substr(sha(uuid()),6,33),hex(2+round(rand())*8)); +-----------------------------------------------------------------------------------------+ | concat('414c2', hex(8+round(rand()*7)),substr(sha(uuid()),6,33),hex(2+round(rand())*8)) | +-----------------------------------------------------------------------------------------+ | 414c29115056f1bd332d4e2e3eb5edd3fc90c0a2                                                | +-----------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)

but if unhex() it:

mariadb [bt]> select unhex(concat('414c2', hex(8+round(rand()*7)),substr(sha(uuid()),6,33),hex(2+round(rand())*8))); +------------------------------------------------------------------------------------------------+ | unhex(concat('414c2', hex(8+round(rand()*7)),substr(sha(uuid()),6,33),hex(2+round(rand())*8))) | +------------------------------------------------------------------------------------------------+ | null                                                                                           | +------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)

by contrast, same command on mysql instance:

mysql> select unhex(upper(concat('414c2', hex(8+round(rand()*7)),substr(sha(uuid()),6,33),hex(2+round(rand())*8)))); +-------------------------------------------------------------------------------------------------------+ | unhex(upper(concat('414c2', hex(8+round(rand()*7)),substr(sha(uuid()),6,33),hex(2+round(rand())*8)))) | +-------------------------------------------------------------------------------------------------------+ | al*w?? ???r?%??                                                                                            | +-------------------------------------------------------------------------------------------------------+ 1 row in set (0.02 sec)

unhex() of 40-character hex string bytes printable works ok on mariadb:

mariadb [bt]> select unhex('4142434445464748494a4b4c4d4e4f5051525354'); +---------------------------------------------------+ | unhex('4142434445464748494a4b4c4d4e4f5051525354') | +---------------------------------------------------+ | abcdefghijklmnopqrst                              | +---------------------------------------------------+ 1 row in set (0.00 sec)

any idea why random hex string wouldn't work?

looks bug. we've filed report this: https://jira.mariadb.org/browse/mdev-13793


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