modified: storage/connect/JdbcInterface.java
- Change Version number and date
modified: storage/connect/ha_connect.cc
- Implement the test on connect_type_conv YES/NO
modified: storage/connect/jdbconn.cpp
modified: storage/connect/odbconn.cpp
- Fix MDEV-10520. Local schema was confused with remote schema
modified: storage/connect/tabjdbc.cpp
modified: storage/connect/tabodbc.cpp
- Fix crash when using mapped indices. Was trying to write in a mapped
file declared as read only.
modified: storage/connect/xindex.cpp
Fix memory barrier issues on releasing mutexes. We must have a full
memory barrier between releasing a mutex lock and reading its waiters.
This prevents us from missing to release waiters due to reading the
number of waiters speculatively before releasing the lock. If threads
try and wait between us reading the waiters count and releasing the
lock, those threads might stall indefinitely.
Also, we must use proper ACQUIRE/RELEASE semantics for atomic
operations, not ACQUIRE/ACQUIRE.
a correct fix:
* store properly quoted table names in tables4repair/etc lists
* tell handle_request_for_tables whether the name is aalready properly quoted
* test cases for all uses of fix_table_name()
We assume all around the code that null_value==true is in sync
with NULL value returned by val_str()/val_decimal().
Item_sum_sum::val_decimal() erroneously returned a non-NULL value together
with null_value set to true. Fixing to return NULL instead.
It happens when you are trying to read two or more log files from a
remote server using mysqlbinlog utility.
The reason for this is no matching mysql_close() that concludes the
life time of 'mysql' struct describing connection to the server.
This happens when mysqlbinlog is invoked with connecting to the server
and requesting more than one binlog file. In such case
dump_remote_log_entries() keeps calling safe_connect() per eachfile,
never caring to invoke mysql_close(). Only the final safe_connect()'s
allocation effect are cleaned by the base code.
That is with 2 files there's one 'mysql' connection descriptor struct
uncleaned/deallocated.
We are backporting the bug 21255763 (pushed in mysql-trunk)
in the earlier version of MySQL starting from 5.5 to 5.7.
which was pushed in mysql-trunk.
Fix:
Invoke mysql_close() just before mysql_init() in safe_connect()
defined in mysqlbinlog.cc. That makes possibly previously used 'mysql' be
reclaimed prior a new one is allocated.
Shared variables of Delayed_insert may be updated without mutex protection
when delayed insert thread gets an error.
Re-acquire mutex earlier, so that shared variables are protected.
ISSUE: Queries with mediumint as column when operated with
long long type of data results in buffer overflow in
store_long function.
The merging rule specified for (MYSQL_TYPE_LONGLONG
MYSQL_TYPE_INT24) is MYSQL_TYPE_LONG. Due to this store_long
function was getting called which resulted in buffer overflow.
SOLUTION:
The correct merging rule for (MYSQL_TYPE_LONGLONG,
MYSQL_TYPE_INT24) should be MYSQL_TYPE_LONGLONG.
So, instead of function store_long, function store_longlong
is called which correctly handles the type MYSQL_TYPE_LONGLONG.
External Bug #23645238 is a duplicate of this issue.
DERIVED TABLE IN JOIN
ISSUE:
------
This problem occurs under the following conditions:
1) A parameter is used in the select-list of a derived table.
2) The derived table is part of a JOIN.
SOLUTION:
---------
When a derived table is materialized, a temporary table is
created. This temporary table creates a field each for the
items in the select-list of the derived table. This set of
fields is later used to setup the join.
Currently no field is created in the temporary table if a
parameter is used in the select-list.
Create a field for the parameter. By default Item_param's
result type in a prepared statement is set to
STRING_RESULT. This can change during the execute phase
depending on the user variable. But since the execute phase
creates its own temporary table, it will be handled
separately.
This is a backport of the fix for BUG#22392374.
Fix get_quick_keys(): When building range tree from a condition
in form
keypart1=const AND (keypart2 < 0 OR keypart2>=0)
the SEL_ARG for keypart2 represents an interval (-inf, +inf).
However, the logic that sets UNIQUE_RANGE flag fails to recognize
this, and sets UNIQUE_RANGE flag if (keypart1, keypart2) covered
a unique key.
As a result, range access executor assumes the interval can have
at most one row and only reads the first row from it.
Problem:
In debug builds, there is a chance that an out-of-bounds
read is performed when tables are locked in
LTM_PRELOCKED_UNDER_LOCK_TABLES mode. It can happen because
the debug code uses enum values as index for an array of
mode descriptions, but it only takes into consideration 3
out of 4 of the enum values.
Fix:
This patch fixes it by implementing a getter for the enum which
returns a string representation of the enum,
effectively removing the out-of-bounds read.
Moreover, it also fixes the lock mode descriptions that
would be print out in debug builds.
