(and valgrind warnings)
* move thd userstat initialization to the same function
that was adding thd userstat to global counters.
* initialize thd->start_bytes_received in THD::init
(when thd->userstat_running is set)
Problem:-
Second execution of prepared statement for query with
parameter in limit clause, causes an assert when using
connectors (e.g., Connector C).
Analysis:-
In prepared statement, LIMIT parameters can be
specified using '?' markers. Value for the parameter can
be supplied while executing the prepared statement.
Passing string, float or double values for LIMIT clause
works well from command-line client. That's because, while
setting the LIMIT parameter value from a user-variable,
the value is converted to integer value.
However, when prepared statement is executed from other
interfaces as J connectors, or C applications etc,
the value for the parameters are sent to the server
with execute command. Each item in command has value and
the data TYPE. So, while setting parameter values
from this log, value is set to all the parameters
with the same data type as passed.
Here, we have the logic to convert the value to change the
state and item_type if it is part of LIMIT parameter and
its item_type is not INT.
But when we reset this parameter we save the item_type but change
state. So on second execution we have old item_type but our state
has been changed, which make us to use string type variable
in Item_param::query_str_val(). This cause an assert.
Fix:
Instead of checking the item_type of the parameter, check for
the state of the parameter. As state value are reset everytime
we execute the statement.
Problem:-
Second execution of prepared statement for query with
parameter in limit clause, causes an assert when using
connectors (e.g., Connector C).
Analysis:-
In prepared statement, LIMIT parameters can be
specified using '?' markers. Value for the parameter can
be supplied while executing the prepared statement.
Passing string, float or double values for LIMIT clause
works well from command-line client. That's because, while
setting the LIMIT parameter value from a user-variable,
the value is converted to integer value.
However, when prepared statement is executed from other
interfaces as J connectors, or C applications etc,
the value for the parameters are sent to the server
with execute command. Each item in command has value and
the data TYPE. So, while setting parameter values
from this log, value is set to all the parameters
with the same data type as passed.
Here, we have the logic to convert the value to change the
state and item_type if it is part of LIMIT parameter and
its item_type is not INT.
But when we reset this parameter we save the item_type but change
state. So on second execution we have old item_type but our state
has been changed, which make us to use string type variable
in Item_param::query_str_val(). This cause an assert.
Fix:
Instead of checking the item_type of the parameter, check for
the state of the parameter. As state value are reset everytime
we execute the statement.
STATUS OF ROLLBACKED TRANSACTION" and bug #17054007 - "TRANSACTION
IS NOT FULLY ROLLED BACK IN CASE OF INNODB DEADLOCK".
The problem in the first bug report was that although deadlock involving
metadata locks was reported using the same error code and message as InnoDB
deadlock it didn't rollback transaction like the latter. This caused
confusion to users as in some cases after ER_LOCK_DEADLOCK transaction
could have been restarted immediately and in some cases rollback was
required.
The problem in the second bug report was that although InnoDB deadlock
caused transaction rollback in all storage engines it didn't cause release
of metadata locks. So concurrent DDL on the tables used in transaction was
blocked until implicit or explicit COMMIT or ROLLBACK was issued in the
connection which got InnoDB deadlock.
The former issue has stemmed from the fact that when support for detection
and reporting metadata locks deadlocks was added we erroneously assumed
that InnoDB doesn't rollback transaction on deadlock but only last statement
(while this is what happens on InnoDB lock timeout actually) and so didn't
implement rollback of transactions on MDL deadlocks.
The latter issue was caused by the fact that rollback of transaction due
to deadlock is carried out by setting THD::transaction_rollback_request
flag at the point where deadlock is detected and performing rollback
inside of trans_rollback_stmt() call when this flag is set. And
trans_rollback_stmt() is not aware of MDL locks, so no MDL locks are
released.
This patch solves these two problems in the following way:
- In case when MDL deadlock is detect transaction rollback is requested
by setting THD::transaction_rollback_request flag.
- Code performing rollback of transaction if THD::transaction_rollback_request
is moved out from trans_rollback_stmt(). Now we handle rollback request
on the same level as we call trans_rollback_stmt() and release statement/
transaction MDL locks.
STATUS OF ROLLBACKED TRANSACTION" and bug #17054007 - "TRANSACTION
IS NOT FULLY ROLLED BACK IN CASE OF INNODB DEADLOCK".
The problem in the first bug report was that although deadlock involving
metadata locks was reported using the same error code and message as InnoDB
deadlock it didn't rollback transaction like the latter. This caused
confusion to users as in some cases after ER_LOCK_DEADLOCK transaction
could have been restarted immediately and in some cases rollback was
required.
The problem in the second bug report was that although InnoDB deadlock
caused transaction rollback in all storage engines it didn't cause release
of metadata locks. So concurrent DDL on the tables used in transaction was
blocked until implicit or explicit COMMIT or ROLLBACK was issued in the
connection which got InnoDB deadlock.
The former issue has stemmed from the fact that when support for detection
and reporting metadata locks deadlocks was added we erroneously assumed
that InnoDB doesn't rollback transaction on deadlock but only last statement
(while this is what happens on InnoDB lock timeout actually) and so didn't
implement rollback of transactions on MDL deadlocks.
The latter issue was caused by the fact that rollback of transaction due
to deadlock is carried out by setting THD::transaction_rollback_request
flag at the point where deadlock is detected and performing rollback
inside of trans_rollback_stmt() call when this flag is set. And
trans_rollback_stmt() is not aware of MDL locks, so no MDL locks are
released.
This patch solves these two problems in the following way:
- In case when MDL deadlock is detect transaction rollback is requested
by setting THD::transaction_rollback_request flag.
- Code performing rollback of transaction if THD::transaction_rollback_request
is moved out from trans_rollback_stmt(). Now we handle rollback request
on the same level as we call trans_rollback_stmt() and release statement/
transaction MDL locks.
includes:
* remove some remnants of "Bug#14521864: MYSQL 5.1 TO 5.5 BUGS PARTITIONING"
* introduce LOCK_share, now LOCK_ha_data is strictly for engines
* rea_create_table() always creates .par file (even in "frm-only" mode)
* fix a 5.6 bug, temp file leak on dummy ALTER TABLE
- Handle statements inside SPs:
= regular statements
= SET command, which does not have its own statement.
- Handle execution of subquery from range optimizer:
allocate subquery QPFs on the same MEM_ROOT as the whole
query plan was allocated.
- Introduce back QueryPlan/QueryPlanFootprint separation for
single-table UPDATEs/DELETEs
- Create an empty QueryPlanFootprint for all kinds of queries
- temporary tables now works
- mysql-system_tables updated to not use temporary tables
- PASSWORD() function fixed
- Support for STATS_AUTO_RECALC, STATS_PERSISTENT and STATS_SAMPLE_PAGES table options
Removed "optimization" which caused preoblems on second execution of PS with string parameter in LIMIT clause.
Fixed test_bug43560 to be able to skipp it if connection is UNIX socket.
* remove unused mysql_option
* don't allocate 5GB of memory in the mtr tests
* restore the behavior in dynamic_column_offset_byte(), put the ifdef correctly
* prefer __attribute__((unused)) to #ifdef
* prefer UNINIT_VAR to LINT_INIT
* make most Warning_info users blissfully unaware of the postponed initialization
* use my_offsetof instead of offsetof where the compiler thinks the latter is incorrect
