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

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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
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8
mysql-test/suite/compat/oracle/r/mysqldump_restore_func_qualified.result
View File

@@ -26,7 +26,7 @@ LTRIM(now()) AS a0,
LPAD(now(),10) AS b0;
/*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` (
`a0` varchar(64) NOT NULL DEFAULT ltrim(current_timestamp()),
`a1` varchar(64) GENERATED ALWAYS AS (ltrim(`a0`)) STORED,
@@ -35,7 +35,7 @@ CREATE TABLE `t1` (
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;
/*!40101 SET character_set_client = @saved_cs_client */;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
/*!40101 SET character_set_client = utf8mb4 */;
CREATE TABLE `t2` (
`a0` varchar(64) NOT NULL DEFAULT ltrim_oracle(current_timestamp()),
`a1` varchar(64) GENERATED ALWAYS AS (ltrim_oracle(`a0`)) STORED,
@@ -44,13 +44,13 @@ CREATE TABLE `t2` (
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;
/*!40101 SET character_set_client = @saved_cs_client */;
SET @saved_cs_client = @@character_set_client;
SET character_set_client = utf8;
SET character_set_client = utf8mb4;
/*!50001 CREATE VIEW `v1` AS SELECT
1 AS `a0`,
1 AS `b0` */;
SET character_set_client = @saved_cs_client;
SET @saved_cs_client = @@character_set_client;
SET character_set_client = utf8;
SET character_set_client = utf8mb4;
/*!50001 CREATE VIEW `v2` AS SELECT
1 AS `a0`,
1 AS `b0` */;