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Check if we can rename triggers before doing an ALTER TABLE ... RENAME

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ALTER TABLE .. RENAME, when used with the inplace algorithm, does:
- Do an inplace or online alter to the new definition
- Rename to new name
- Update triggers.

If update triggers would fail, we would rename the table back.
The problem with this approach is that the table would have the new
definition but the rename would fail.  The binary log would also not be
updated.

The solution to this is to very early check if we can rename triggers
and give an error if this would fail.
Both ALTER TABLE ... RENAME and RENAME TABLE is fixed.

This was implemented by moving the pre-check of rename table in triggers
from Table_triggers_list::change_table_name() to
Table_triggers_list::prepare_for_rename().
This commit is contained in:
Monty
2021-03-22 16:05:08 +02:00
committed by Sergei Golubchik
parent c844a76b0a
commit 3c578b0a96
5 changed files with 178 additions and 65 deletions
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34
sql/sql_trigger.h
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@ -79,6 +79,30 @@ struct st_trg_execution_order
};
/*
Parameter to change_table_name_in_triggers()
*/
class TRIGGER_RENAME_PARAM
{
public:
TABLE table;
bool upgrading50to51;
bool got_error;
TRIGGER_RENAME_PARAM()
{
upgrading50to51= got_error= 0;
table.reset();
}
~TRIGGER_RENAME_PARAM()
{
reset();
}
void reset();
};
class Table_triggers_list;
/**
@ -237,7 +261,14 @@ public:
TABLE *table, bool names_only);
static bool drop_all_triggers(THD *thd, const LEX_CSTRING *db,
const LEX_CSTRING *table_name, myf MyFlags);
static bool change_table_name(THD *thd, const LEX_CSTRING *db,
static bool prepare_for_rename(THD *thd, TRIGGER_RENAME_PARAM *param,
const LEX_CSTRING *db,
const LEX_CSTRING *old_alias,
const LEX_CSTRING *old_table,
const LEX_CSTRING *new_db,
const LEX_CSTRING *new_table);
static bool change_table_name(THD *thd, TRIGGER_RENAME_PARAM *param,
const LEX_CSTRING *db,
const LEX_CSTRING *old_alias,
const LEX_CSTRING *old_table,
const LEX_CSTRING *new_db,
@ -315,6 +346,7 @@ private:
}
};
bool add_table_for_trigger(THD *thd,
const sp_name *trg_name,
bool continue_if_not_exist,