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MDEV-20548 Unexpected error on CREATE..SELECT HEX(num)

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Item_func_hex::fix_length_and_dec() evaluated a too short data type
for signed numeric arguments, which resulted in a 'Data too long for column'
error on CREATE..SELECT.

Fixing the code to take into account that a short negative
numer can produce a long HEX value: -1  -> 'FFFFFFFFFFFFFFFF'

Also fixing Item_func_hex::val_str_ascii_from_val_real().
Without this change, MTR test with HEX with negative float point arguments
failed on some platforms (aarch64, ppc64le, s390-x).
This commit is contained in:
Alexander Barkov
2024-06-25 09:27:11 +04:00
parent e7b76f87c4
commit d046b13e7b
11 changed files with 514 additions and 7 deletions
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mysql-test/main/func_str.result
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@ -748,7 +748,7 @@ t1 CREATE TABLE `t1` (
`bin(130)` varchar(64) DEFAULT NULL,
`oct(130)` varchar(64) DEFAULT NULL,
`conv(130,16,10)` varchar(64) DEFAULT NULL,
`hex(130)` varchar(6) DEFAULT NULL,
`hex(130)` varchar(16) DEFAULT NULL,
`char(130)` varbinary(4) DEFAULT NULL,
`format(130,10)` varchar(25) DEFAULT NULL,
`left(_latin2'a',1)` varchar(1) CHARACTER SET latin2 COLLATE latin2_general_ci DEFAULT NULL,