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MDEV-25659 trigger name is empty after upgrade to 10.4

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Problem:

At some point, we made stored rountines fail at CREATE time
instead of execution time in case of this syntax:

   IF unknown_variable
     ...
   END IF

As a result, a trigger created before this change and contained an unknown
variable worked in a bad way after upgrade:
- It was displayed with an empty trigger name by SHOW CREATE TRIGGER
- It was displayed with an empty trigger name by INFORMATION_SCHEMA.TRIGGERS
- An attempt to DROP this trigger returned errors - nothing happened.
- DROP TABLE did not remove the .TRN file corresponding to this broken trigger.

Underlying code observations:

The old code assumed that the trigger name resides in the current lex:

  if(thd->lex->spname)
    m_trigger_name= &thd->lex->spname->m_name;

This is not always the case. Some SP statements (e.g. IF)
do the following in their beginning:

- create a separate local LEX
- set thd->lex to this new local LEX
- push the new local LEX to the stack in sp_head::m_lex

and the following at the end of the statement:

- pop the previous LEX from the stack sp_head::m_lex
- set thd->lex back to the popped value

So when the parse error happens inside e.g. IF statement, thd->lex->spname
is a NULL pointer, because thd->lex points to the local LEX (without SP name)
rather than the top level LEX (with SP name).

Fix:
- Adding a new method sp_head::find_spname_recursive()
  which walks inside the LEX stack sp_head::m_lex from
  the top (the newest, most local) to the bottom (the oldest),
  and finds the one which contains a non-zero spname pointer.

- Using the new method inside
  Deprecated_trigger_syntax_handler::handle_condition():
  First it still tests thd->lex->spname (like before this change),
  and uses it in case it is not empty.
  Otherwise (if thd->lex->spname is empty), it calls
  sp_head::find_spname_recursive() to find the LEX with a
  non-empty spname inside the LEX stack of the current sphead.
This commit is contained in:
Alexander Barkov
2022-01-13 14:20:05 +04:00
parent 6d8794e567
commit 2832b949fc
4 changed files with 546 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

295
mysql-test/main/trigger-compat.result
View File

@ -142,3 +142,298 @@ DROP TRIGGER tr12;
DROP TRIGGER tr11;
DROP TABLE t1;
DROP TABLE t2;
#
# MDEV-25659 trigger name is empty after upgrade to 10.4
#
# START: Total triggers 1, broken triggers 1, DROP TABLE
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
FLUSH TABLES;
DELETE FROM t1 WHERE a=1;
ERROR 42000: Trigger 'tr1' has an error in its body: 'Undeclared variable: unknown_variable'
INSERT INTO t1 VALUES (2);
ERROR 42000: Trigger 'tr1' has an error in its body: 'Undeclared variable: unknown_variable'
SET time_zone='+00:00';
SHOW TRIGGERS LIKE 't1';
Trigger tr1
Event DELETE
Table t1
Statement CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
BEGIN
IF unknown_variable
THEN
INSERT INTO t2 VALUES (OLD.a);
END IF;
END
Timing AFTER
Created 2022-01-13 08:23:06.47
sql_mode STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
Definer
character_set_client utf8
collation_connection utf8_general_ci
Database Collation latin1_swedish_ci
SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='tr1';
TRIGGER_CATALOG def
TRIGGER_SCHEMA test
TRIGGER_NAME tr1
EVENT_MANIPULATION DELETE
EVENT_OBJECT_CATALOG def
EVENT_OBJECT_SCHEMA test
EVENT_OBJECT_TABLE t1
ACTION_ORDER 1
ACTION_CONDITION NULL
ACTION_STATEMENT CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
BEGIN
IF unknown_variable
THEN
INSERT INTO t2 VALUES (OLD.a);
END IF;
END
ACTION_ORIENTATION ROW
ACTION_TIMING AFTER
ACTION_REFERENCE_OLD_TABLE NULL
ACTION_REFERENCE_NEW_TABLE NULL
ACTION_REFERENCE_OLD_ROW OLD
ACTION_REFERENCE_NEW_ROW NEW
CREATED 2022-01-13 08:23:06.47
SQL_MODE STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
DEFINER
CHARACTER_SET_CLIENT utf8
COLLATION_CONNECTION utf8_general_ci
DATABASE_COLLATION latin1_swedish_ci
SET time_zone=DEFAULT;
# Listing trigger files
t1.TRG
tr1.TRN
# Listing trigger files done
DROP TABLE t1;
# Listing trigger files
# Listing trigger files done
# END: Total triggers 1, broken triggers 1, DROP TABLE
# START: Total triggers 1, broken triggers 1, DROP TRIGGER
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
FLUSH TABLES;
DELETE FROM t1 WHERE a=1;
ERROR 42000: Trigger 'tr1' has an error in its body: 'Undeclared variable: unknown_variable'
INSERT INTO t1 VALUES (2);
ERROR 42000: Trigger 'tr1' has an error in its body: 'Undeclared variable: unknown_variable'
SET time_zone='+00:00';
SHOW TRIGGERS LIKE 't1';
Trigger tr1
Event DELETE
Table t1
Statement CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
BEGIN
IF unknown_variable
THEN
INSERT INTO t2 VALUES (OLD.a);
END IF;
END
Timing AFTER
Created 2022-01-13 08:23:06.47
sql_mode STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
Definer
character_set_client utf8
collation_connection utf8_general_ci
Database Collation latin1_swedish_ci
SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='tr1';
TRIGGER_CATALOG def
TRIGGER_SCHEMA test
TRIGGER_NAME tr1
EVENT_MANIPULATION DELETE
EVENT_OBJECT_CATALOG def
EVENT_OBJECT_SCHEMA test
EVENT_OBJECT_TABLE t1
ACTION_ORDER 1
ACTION_CONDITION NULL
ACTION_STATEMENT CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
BEGIN
IF unknown_variable
THEN
INSERT INTO t2 VALUES (OLD.a);
END IF;
END
ACTION_ORIENTATION ROW
ACTION_TIMING AFTER
ACTION_REFERENCE_OLD_TABLE NULL
ACTION_REFERENCE_NEW_TABLE NULL
ACTION_REFERENCE_OLD_ROW OLD
ACTION_REFERENCE_NEW_ROW NEW
CREATED 2022-01-13 08:23:06.47
SQL_MODE STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
DEFINER
CHARACTER_SET_CLIENT utf8
COLLATION_CONNECTION utf8_general_ci
DATABASE_COLLATION latin1_swedish_ci
SET time_zone=DEFAULT;
# Listing trigger files
t1.TRG
tr1.TRN
# Listing trigger files done
DROP TRIGGER tr1;
# Listing trigger files
# Listing trigger files done
DROP TABLE t1;
# END: Total triggers 1, broken triggers 1, DROP TRIGGER
# START: Total triggers 2, broken triggers 1, DROP TABLE
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
FLUSH TABLES;
DELETE FROM t1 WHERE a=1;
ERROR 42000: Trigger 'tr1' has an error in its body: 'Undeclared variable: unknown_variable'
INSERT INTO t1 VALUES (2);
ERROR 42000: Trigger 'tr1' has an error in its body: 'Undeclared variable: unknown_variable'
SET time_zone='+00:00';
SHOW TRIGGERS LIKE 't1';
Trigger tr2
Event INSERT
Table t1
Statement INSERT INTO t2 VALUES (NEW.a+100)
Timing AFTER
Created 2022-01-13 10:01:48.74
sql_mode STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
Definer root@localhost
character_set_client utf8
collation_connection utf8_general_ci
Database Collation latin1_swedish_ci
Trigger tr1
Event DELETE
Table t1
Statement CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
BEGIN
IF unknown_variable
THEN
INSERT INTO t2 VALUES (OLD.a);
END IF;
END
Timing AFTER
Created 2022-01-13 10:01:48.73
sql_mode STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
Definer
character_set_client utf8
collation_connection utf8_general_ci
Database Collation latin1_swedish_ci
SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='tr1';
TRIGGER_CATALOG def
TRIGGER_SCHEMA test
TRIGGER_NAME tr1
EVENT_MANIPULATION DELETE
EVENT_OBJECT_CATALOG def
EVENT_OBJECT_SCHEMA test
EVENT_OBJECT_TABLE t1
ACTION_ORDER 1
ACTION_CONDITION NULL
ACTION_STATEMENT CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
BEGIN
IF unknown_variable
THEN
INSERT INTO t2 VALUES (OLD.a);
END IF;
END
ACTION_ORIENTATION ROW
ACTION_TIMING AFTER
ACTION_REFERENCE_OLD_TABLE NULL
ACTION_REFERENCE_NEW_TABLE NULL
ACTION_REFERENCE_OLD_ROW OLD
ACTION_REFERENCE_NEW_ROW NEW
CREATED 2022-01-13 10:01:48.73
SQL_MODE STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
DEFINER
CHARACTER_SET_CLIENT utf8
COLLATION_CONNECTION utf8_general_ci
DATABASE_COLLATION latin1_swedish_ci
SET time_zone=DEFAULT;
# Listing trigger files
t1.TRG
tr1.TRN
tr2.TRN
# Listing trigger files done
DROP TABLE t1;
# Listing trigger files
# Listing trigger files done
# END: Total triggers 2, broken triggers 1, using DROP TABLE
# START: Total triggers 2, broken triggers 1, DROP TRIGGER
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
FLUSH TABLES;
DELETE FROM t1 WHERE a=1;
ERROR 42000: Trigger 'tr1' has an error in its body: 'Undeclared variable: unknown_variable'
INSERT INTO t1 VALUES (2);
ERROR 42000: Trigger 'tr1' has an error in its body: 'Undeclared variable: unknown_variable'
SET time_zone='+00:00';
SHOW TRIGGERS LIKE 't1';
Trigger tr2
Event INSERT
Table t1
Statement INSERT INTO t2 VALUES (NEW.a+100)
Timing AFTER
Created 2022-01-13 10:01:48.74
sql_mode STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
Definer root@localhost
character_set_client utf8
collation_connection utf8_general_ci
Database Collation latin1_swedish_ci
Trigger tr1
Event DELETE
Table t1
Statement CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
BEGIN
IF unknown_variable
THEN
INSERT INTO t2 VALUES (OLD.a);
END IF;
END
Timing AFTER
Created 2022-01-13 10:01:48.73
sql_mode STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
Definer
character_set_client utf8
collation_connection utf8_general_ci
Database Collation latin1_swedish_ci
SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='tr1';
TRIGGER_CATALOG def
TRIGGER_SCHEMA test
TRIGGER_NAME tr1
EVENT_MANIPULATION DELETE
EVENT_OBJECT_CATALOG def
EVENT_OBJECT_SCHEMA test
EVENT_OBJECT_TABLE t1
ACTION_ORDER 1
ACTION_CONDITION NULL
ACTION_STATEMENT CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
BEGIN
IF unknown_variable
THEN
INSERT INTO t2 VALUES (OLD.a);
END IF;
END
ACTION_ORIENTATION ROW
ACTION_TIMING AFTER
ACTION_REFERENCE_OLD_TABLE NULL
ACTION_REFERENCE_NEW_TABLE NULL
ACTION_REFERENCE_OLD_ROW OLD
ACTION_REFERENCE_NEW_ROW NEW
CREATED 2022-01-13 10:01:48.73
SQL_MODE STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
DEFINER
CHARACTER_SET_CLIENT utf8
COLLATION_CONNECTION utf8_general_ci
DATABASE_COLLATION latin1_swedish_ci
SET time_zone=DEFAULT;
# Listing trigger files
t1.TRG
tr1.TRN
tr2.TRN
# Listing trigger files done
DROP TRIGGER tr1;
# Listing trigger files
t1.TRG
tr2.TRN
# Listing trigger files done
INSERT INTO t1 VALUES (100);
ERROR 42S02: Table 'test.t2' doesn't exist
DROP TABLE t1;
# Listing trigger files
# Listing trigger files done
# END: Total triggers 2, broken triggers 1, using DROP TRIGGER

216
mysql-test/main/trigger-compat.test
View File

@ -289,3 +289,219 @@ DROP TRIGGER tr11;
DROP TABLE t1;
DROP TABLE t2;
--echo #
--echo # MDEV-25659 trigger name is empty after upgrade to 10.4
--echo #
--echo # START: Total triggers 1, broken triggers 1, DROP TABLE
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
--write_file $MYSQLD_DATADIR/test/tr1.TRN
TYPE=TRIGGERNAME
trigger_table=t1
EOF
--write_file $MYSQLD_DATADIR/test/t1.TRG
TYPE=TRIGGERS
triggers='CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW\nBEGIN\n IF unknown_variable\n THEN\n INSERT INTO t2 VALUES (OLD.a);\n END IF;\nEND'
sql_modes=1411383296
definers='root@localhost'
client_cs_names='utf8'
connection_cl_names='utf8_general_ci'
db_cl_names='latin1_swedish_ci'
created=164206218647
EOF
FLUSH TABLES;
--error ER_PARSE_ERROR
DELETE FROM t1 WHERE a=1;
--error ER_PARSE_ERROR
INSERT INTO t1 VALUES (2);
SET time_zone='+00:00';
--vertical_results
SHOW TRIGGERS LIKE 't1';
SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='tr1';
--horizontal_results
SET time_zone=DEFAULT;
--echo # Listing trigger files
--list_files $MYSQLD_DATADIR/test *.TR?
--echo # Listing trigger files done
DROP TABLE t1;
--echo # Listing trigger files
--list_files $MYSQLD_DATADIR/test *.TR?
--echo # Listing trigger files done
--echo # END: Total triggers 1, broken triggers 1, DROP TABLE
--echo # START: Total triggers 1, broken triggers 1, DROP TRIGGER
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
--write_file $MYSQLD_DATADIR/test/tr1.TRN
TYPE=TRIGGERNAME
trigger_table=t1
EOF
--write_file $MYSQLD_DATADIR/test/t1.TRG
TYPE=TRIGGERS
triggers='CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW\nBEGIN\n IF unknown_variable\n THEN\n INSERT INTO t2 VALUES (OLD.a);\n END IF;\nEND'
sql_modes=1411383296
definers='root@localhost'
client_cs_names='utf8'
connection_cl_names='utf8_general_ci'
db_cl_names='latin1_swedish_ci'
created=164206218647
EOF
FLUSH TABLES;
--error ER_PARSE_ERROR
DELETE FROM t1 WHERE a=1;
--error ER_PARSE_ERROR
INSERT INTO t1 VALUES (2);
SET time_zone='+00:00';
--vertical_results
SHOW TRIGGERS LIKE 't1';
SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='tr1';
--horizontal_results
SET time_zone=DEFAULT;
--echo # Listing trigger files
--list_files $MYSQLD_DATADIR/test *.TR?
--echo # Listing trigger files done
DROP TRIGGER tr1;
--echo # Listing trigger files
--list_files $MYSQLD_DATADIR/test *.TR?
--echo # Listing trigger files done
DROP TABLE t1;
--echo # END: Total triggers 1, broken triggers 1, DROP TRIGGER
--echo # START: Total triggers 2, broken triggers 1, DROP TABLE
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
--write_file $MYSQLD_DATADIR/test/tr1.TRN
TYPE=TRIGGERNAME
trigger_table=t1
EOF
--write_file $MYSQLD_DATADIR/test/tr2.TRN
TYPE=TRIGGERNAME
trigger_table=t1
EOF
--write_file $MYSQLD_DATADIR/test/t1.TRG
TYPE=TRIGGERS
triggers='CREATE DEFINER=`root`@`localhost` TRIGGER tr2 AFTER INSERT ON t1 FOR EACH ROW INSERT INTO t2 VALUES (NEW.a+100)' 'CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW\nBEGIN\n IF unknown_variable\n THEN\n INSERT INTO t2 VALUES (OLD.a);\n END IF;\nEND'
sql_modes=1411383296 1411383296
definers='root@localhost' 'root@localhost'
client_cs_names='utf8' 'utf8'
connection_cl_names='utf8_general_ci' 'utf8_general_ci'
db_cl_names='latin1_swedish_ci' 'latin1_swedish_ci'
created=164206810874 164206810873
EOF
FLUSH TABLES;
--error ER_PARSE_ERROR
DELETE FROM t1 WHERE a=1;
--error ER_PARSE_ERROR
INSERT INTO t1 VALUES (2);
SET time_zone='+00:00';
--vertical_results
SHOW TRIGGERS LIKE 't1';
SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='tr1';
--horizontal_results
SET time_zone=DEFAULT;
--echo # Listing trigger files
--list_files $MYSQLD_DATADIR/test *.TR?
--echo # Listing trigger files done
DROP TABLE t1;
--echo # Listing trigger files
--list_files $MYSQLD_DATADIR/test *.TR?
--echo # Listing trigger files done
--echo # END: Total triggers 2, broken triggers 1, using DROP TABLE
--echo # START: Total triggers 2, broken triggers 1, DROP TRIGGER
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
--write_file $MYSQLD_DATADIR/test/tr1.TRN
TYPE=TRIGGERNAME
trigger_table=t1
EOF
--write_file $MYSQLD_DATADIR/test/tr2.TRN
TYPE=TRIGGERNAME
trigger_table=t1
EOF
--write_file $MYSQLD_DATADIR/test/t1.TRG
TYPE=TRIGGERS
triggers='CREATE DEFINER=`root`@`localhost` TRIGGER tr2 AFTER INSERT ON t1 FOR EACH ROW INSERT INTO t2 VALUES (NEW.a+100)' 'CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW\nBEGIN\n IF unknown_variable\n THEN\n INSERT INTO t2 VALUES (OLD.a);\n END IF;\nEND'
sql_modes=1411383296 1411383296
definers='root@localhost' 'root@localhost'
client_cs_names='utf8' 'utf8'
connection_cl_names='utf8_general_ci' 'utf8_general_ci'
db_cl_names='latin1_swedish_ci' 'latin1_swedish_ci'
created=164206810874 164206810873
EOF
FLUSH TABLES;
--error ER_PARSE_ERROR
DELETE FROM t1 WHERE a=1;
--error ER_PARSE_ERROR
INSERT INTO t1 VALUES (2);
SET time_zone='+00:00';
--vertical_results
SHOW TRIGGERS LIKE 't1';
SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='tr1';
--horizontal_results
SET time_zone=DEFAULT;
--echo # Listing trigger files
--list_files $MYSQLD_DATADIR/test *.TR?
--echo # Listing trigger files done
DROP TRIGGER tr1;
--echo # Listing trigger files
--list_files $MYSQLD_DATADIR/test *.TR?
--echo # Listing trigger files done
# Now we dropped the broken trigger. Make sure the good one is fired.
# If everything goes as expected, it will try to insert into t2,
# which does not exists, hence the (expected) error.
--error ER_NO_SUCH_TABLE
INSERT INTO t1 VALUES (100);
DROP TABLE t1;
--echo # Listing trigger files
--list_files $MYSQLD_DATADIR/test *.TR?
--echo # Listing trigger files done
--echo # END: Total triggers 2, broken triggers 1, using DROP TRIGGER

17
sql/sp_head.h
View File

@ -612,6 +612,23 @@ public:
DBUG_RETURN(false);
}
/**
Iterate through the LEX stack from the top (the newest) to the bottom
(the oldest) and find the one that contains a non-zero spname.
@returns - the address of spname, or NULL of no spname found.
*/
const sp_name *find_spname_recursive()
{
uint count= m_lex.elements;
for (uint i= 0; i < count; i++)
{
const LEX *tmp= m_lex.elem(count - i - 1);
if (tmp->spname)
return tmp->spname;
}
return NULL;
}
/// Put the instruction on the backpatch list, associated with the label.
int
push_backpatch(THD *thd, sp_instr *, sp_label *);

21
sql/sql_trigger.cc
View File

@ -292,7 +292,7 @@ class Deprecated_trigger_syntax_handler : public Internal_error_handler
private:
char m_message[MYSQL_ERRMSG_SIZE];
LEX_CSTRING *m_trigger_name;
const LEX_CSTRING *m_trigger_name;
public:
@ -308,8 +308,23 @@ public:
if (sql_errno != EE_OUTOFMEMORY &&
sql_errno != ER_OUT_OF_RESOURCES)
{
// Check if the current LEX contains a non-empty spname
if(thd->lex->spname)
m_trigger_name= &thd->lex->spname->m_name;
else if (thd->lex->sphead)
{
/*
Some SP statements, for example IF, create their own local LEX.
All LEX instances are available in the LEX stack in sphead::m_lex.
Let's find the one that contains a non-zero spname.
Note, although a parse error has happened, the LEX instances
in sphead::m_lex are not freed yet at this point. The first
found non-zero spname contains the valid trigger name.
*/
const sp_name *spname= thd->lex->sphead->find_spname_recursive();
if (spname)
m_trigger_name= &spname->m_name;
}
if (m_trigger_name)
my_snprintf(m_message, sizeof(m_message),
ER_THD(thd, ER_ERROR_IN_TRIGGER_BODY),
@ -322,7 +337,7 @@ public:
return false;
}
LEX_CSTRING *get_trigger_name() { return m_trigger_name; }
const LEX_CSTRING *get_trigger_name() { return m_trigger_name; }
char *get_error_message() { return m_message; }
};
@ -1490,7 +1505,7 @@ bool Table_triggers_list::check_n_load(THD *thd, const LEX_CSTRING *db,
if (unlikely(parse_error))
{
LEX_CSTRING *name;
const LEX_CSTRING *name;
/*
In case of errors, disable all triggers for the table, but keep