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MDEV-25829 Change default Unicode collation to uca1400_ai_ci

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Step#1 - Changing collation derivation for string user variables
from IMPLICIT to COERCIBLE.

Retionale:

Without this preparatory change, switching the default collation for
Unicode character sets from xxx_general_ci to uca1400_ai_ci would cause
"Illegal mix of collations" errors in scenarios comparing a column with
a non-default collation to a string user variable

This is especially important for queries to INFORMATION_SCHEMA tables,
whose columns use utf8mb3_general_ci.

See the description of MDEV-25829 for more details and SQL script examples.
This commit is contained in:
Alexander Barkov
2023-11-15 06:09:41 +04:00
parent 44974a0788
commit 1b65cc9da7
5 changed files with 33 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
mysql-test/main/func_regexp_pcre.result
View File

@ -859,11 +859,22 @@ REGEXP_REPLACE('1 foo and bar', '(\\d+) foo and (\\d+ )?bar', '\\1 this and \\2t
1 this and that
#
# MDEV-8102 REGEXP function fails to match hex values when expression is stored as a variable
#
# Testing a warning
#
# Testing a warning
SET NAMES latin1;
SET @regCheck= '\\xE0\\x01';
SELECT 0xE001 REGEXP @regCheck COLLATE latin1_bin;
0xE001 REGEXP @regCheck COLLATE latin1_bin
0
Warnings:
Warning 1139 Regex error 'UTF-8 error: 1 byte missing at end'
SELECT 0xE001 REGEXP CAST(@regCheck AS CHAR);
0xE001 REGEXP CAST(@regCheck AS CHAR)
0
Warnings:
Warning 1139 Regex error 'UTF-8 error: 1 byte missing at end'
# Since 11.4 user variables have DERIVATION_COERCIBLE
# so a user variable and a literal in the pattern give equal results
SET @regCheck= '\\xE0\\x01';
SELECT 0xE001 REGEXP '\\xE0\\x01' AS c1, 0xE001 REGEXP @regCheck AS c2;
c1 c2

8
mysql-test/main/func_regexp_pcre.test
View File

@ -428,7 +428,13 @@ SELECT REGEXP_REPLACE('1 foo and bar', '(\\d+) foo and (\\d+ )?bar', '\\1 this a
--echo # Testing a warning
SET NAMES latin1;
SET @regCheck= '\\xE0\\x01';
SELECT 0xE001 REGEXP @regCheck;
SELECT 0xE001 REGEXP @regCheck COLLATE latin1_bin;
SELECT 0xE001 REGEXP CAST(@regCheck AS CHAR);
--echo # Since 11.4 user variables have DERIVATION_COERCIBLE
--echo # so a user variable and a literal in the pattern give equal results
SET @regCheck= '\\xE0\\x01';
SELECT 0xE001 REGEXP '\\xE0\\x01' AS c1, 0xE001 REGEXP @regCheck AS c2;
--echo # Testing workaround N1: This makes the pattern to be a binary string:
SET NAMES latin1;

4
mysql-test/main/get_diagnostics.result
View File

@ -774,10 +774,10 @@ Warning 1916 Got overflow when converting '-19999999999999999999' to INT. Value
GET DIAGNOSTICS CONDITION 1 @var1 = MESSAGE_TEXT, @var2 = CLASS_ORIGIN;
SELECT CHARSET(@var1), COLLATION(@var1), COERCIBILITY(@var1);
CHARSET(@var1) COLLATION(@var1) COERCIBILITY(@var1)
utf8mb3 utf8mb3_general_ci 2
utf8mb3 utf8mb3_general_ci 4
SELECT CHARSET(@var2), COLLATION(@var2), COERCIBILITY(@var2);
CHARSET(@var2) COLLATION(@var2) COERCIBILITY(@var2)
utf8mb3 utf8mb3_general_ci 2
utf8mb3 utf8mb3_general_ci 4
#
# Command statistics
#

14
mysql-test/main/user_var.result
View File

@ -137,7 +137,7 @@ drop table t1;
set @a=_latin2'test';
select charset(@a),collation(@a),coercibility(@a);
charset(@a) collation(@a) coercibility(@a)
latin2 latin2_general_ci 2
latin2 latin2_general_ci 4
select @a=_latin2'TEST';
@a=_latin2'TEST'
1
@ -147,7 +147,7 @@ select @a=_latin2'TEST' collate latin2_bin;
set @a=_latin2'test' collate latin2_general_ci;
select charset(@a),collation(@a),coercibility(@a);
charset(@a) collation(@a) coercibility(@a)
latin2 latin2_general_ci 2
latin2 latin2_general_ci 4
select @a=_latin2'TEST';
@a=_latin2'TEST'
1
@ -162,19 +162,19 @@ collation(@a:=_latin2'test')
latin2_general_ci
select coercibility(@a:=_latin2'test');
coercibility(@a:=_latin2'test')
2
4
select collation(@a:=_latin2'test' collate latin2_bin);
collation(@a:=_latin2'test' collate latin2_bin)
latin2_bin
select coercibility(@a:=_latin2'test' collate latin2_bin);
coercibility(@a:=_latin2'test' collate latin2_bin)
2
4
select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST';
(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST'
0
select charset(@a),collation(@a),coercibility(@a);
charset(@a) collation(@a) coercibility(@a)
latin2 latin2_bin 2
latin2 latin2_bin 4
select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci;
(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci
1
@ -184,11 +184,11 @@ my_column
0
select @v, coercibility(@v);
@v coercibility(@v)
NULL 2
NULL 4
set @v1=null, @v2=1, @v3=1.1, @v4=now();
select coercibility(@v1),coercibility(@v2),coercibility(@v3),coercibility(@v4);
coercibility(@v1) coercibility(@v2) coercibility(@v3) coercibility(@v4)
2 5 5 2
4 5 5 4
set session @honk=99;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '@honk=99' at line 1
select @@local.max_allowed_packet;

8
sql/item_func.cc
View File

@ -4734,7 +4734,7 @@ bool Item_func_set_user_var::fix_fields(THD *thd, Item **ref)
&my_charset_numeric : args[0]->collation.collation);
collation.set(m_var_entry->charset(),
args[0]->collation.derivation == DERIVATION_NUMERIC ?
DERIVATION_NUMERIC : DERIVATION_IMPLICIT);
DERIVATION_NUMERIC : DERIVATION_COERCIBLE);
switch (args[0]->result_type()) {
case STRING_RESULT:
case TIME_RESULT:
@ -4799,7 +4799,7 @@ Item_func_set_user_var::fix_length_and_dec(THD *thd)
}
else
{
collation.set(DERIVATION_IMPLICIT);
collation.set(DERIVATION_COERCIBLE);
fix_length_and_charset(args[0]->max_char_length(),
args[0]->collation.collation);
}
@ -5676,7 +5676,7 @@ bool Item_func_get_user_var::fix_length_and_dec(THD *thd)
set_handler(&type_handler_slonglong);
break;
case STRING_RESULT:
collation.set(m_var_entry->charset(), DERIVATION_IMPLICIT);
collation.set(m_var_entry->charset(), DERIVATION_COERCIBLE);
max_length= MAX_BLOB_WIDTH - 1;
set_handler(&type_handler_long_blob);
if (m_var_entry->type_handler()->field_type() == MYSQL_TYPE_GEOMETRY)
@ -5696,7 +5696,7 @@ bool Item_func_get_user_var::fix_length_and_dec(THD *thd)
}
else
{
collation.set(&my_charset_bin, DERIVATION_IMPLICIT);
collation.set(&my_charset_bin, DERIVATION_COERCIBLE);
null_value= 1;
set_handler(&type_handler_long_blob);
max_length= MAX_BLOB_WIDTH;