database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-08 11:22:35 +03:00
Code Activity

MDEV-29968 Functions in default values in tables with some character sets break SHOW CREATE (and mysqldump)

Browse Source 
Item:print_for_table_def() uses QT_TO_SYSTEM_CHARSET to print
the DEFAULT expression into FRM file during CREATE TABLE.
Therefore, the expression is encoded in utf8 in FRM.

get_field_default_value() erroneously used field->charset() to
print the DEFAULT expression at SHOW CREATE TABLE time.

Fixing get_field_default_value() to use &my_charset_utf8mb4_general_ci instead.
This makes DEFAULT work in the way way with:

- virtual column expressions:

    if (field->vcol_info)
    {
      StringBuffer<MAX_FIELD_WIDTH> str(&my_charset_utf8mb4_general_ci);
      field->vcol_info->print(&str);

- check constraint expressions:

    if (field->check_constraint)
    {
      StringBuffer<MAX_FIELD_WIDTH> str(&my_charset_utf8mb4_general_ci);
      field->check_constraint->print(&str);

Additional cleanup:
Fixing system_charset_info to &my_charset_utf8mb4_general_ci in a few
places to make non-BMP characters work in DEFAULT, virtual column,
check constraint expressions.
This commit is contained in:
Alexander Barkov
2024-11-26 13:34:28 +04:00
parent f521b8ac21
commit 350cc77fee
24 changed files with 413 additions and 179 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
mysql-test/main/trigger_wl3253.result
View File

@@ -312,7 +312,7 @@ CREATE TRIGGER tr2_bi BEFORE INSERT ON t1 FOR EACH ROW SET @a:=2;
CREATE TRIGGER tr1_bu BEFORE UPDATE ON t1 FOR EACH ROW SET @a:=3;
/*M!999999\- enable the sandbox mode */
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
/*!40101 SET character_set_client = utf8mb4 */;
CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;
@@ -375,7 +375,7 @@ CREATE TRIGGER tr1_1_bi BEFORE INSERT ON t1 FOR EACH ROW FOLLOWS tr1_bi SET @a:=
# Expected order of triggers in the dump is: tr0_bi, tr1_bi, tr1_1_bi, tr2_i.
/*M!999999\- enable the sandbox mode */
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
/*!40101 SET character_set_client = utf8mb4 */;
CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;