TABLE DATA IF DUMPS MYSQL DATABA
Problem: If mysqldump is run without --events (or with --skip-events)
it will not dump the mysql.event table's data. This behaviour is inconsistent
with that of --routines option, which does not affect the dumping of
mysql.proc table. According to the Manual, --events (--skip-events) defines,
if the Event Scheduler events for the dumped databases should be included
in the mysqldump output and this has nothing to do with the mysql.event table
itself.
Solution: A warning has been added when mysqldump is used without --events 
(or with --skip-events) and a separate patch with the behavioral change 
will be prepared for 5.6/trunk.

 
 Analysis
 --------- 
 
 my_stat() calls stat() and if the stat() call fails we try to set 
 the variable  my_errno which is actually a thread specific data .
 We try to get the  address of this thread specific data using
 my_pthread_getspecifc(),but for the purge thread we have not defined 
 any thread specific data so it returns null and when dereferencing 
 null we get a segmentation fault.
        init_available_charsets() seen in the core stack is invoked 
 through  pthread_once() .pthread_once is used for one time 
 initialization.Since free_charsets() is called before innodb plugin 
 shutdown ,purge thread calls init_avaliable_charsets() which leads 
 to the crash.

 Fix
 ---
 Call free_charsets() after the innodb plugin shutdown,since purge 
 threads are still using the charsets. 

Follow up patch to address the pb2 failures.

Brief description: After insert some rows to MEMORY table with HASH key some 
rows can't be deleted in one step.    

Problem Analysis/solution: info->current_ptr will have the information about the
current hash pointer from where we can traverse to the list to get all the       
remaining tuples.
      
In hp_delete_key we are updating info->current_ptr with the last_pos based on       
the flag parameter(which is the keydef and last index are same). As part of the       
fix we are making it to zero only when the code flow reaches to the end of the       
function hp_delete_key() it means that the next record which has to get deleted       
will be at the starting of the list so, that in the next call to       
read record(heap_rnext()) will take line number 100 path instead of 102 path, 
please see the below code in file hp_rnext.c, function heap_rnext().
 99       else if (!info->current_ptr)              /* Deleted or first call */
100         pos= hp_search(info, keyinfo, info->lastkey, 0);
101       else  
102         pos= hp_search(info, keyinfo, info->lastkey, 1);

with that change the hp_search() will update the info->current_ptr with the 
record which needs to be deleted.

PROBLEM 
-------

optimize on partiton will recreate the whole table 
instead of just partition.

ANALYSIS
--------

At present innodb doesn't support optimize option ,so we do a rebuild of the 
whole table and then call analyze() on the table.Presently for any optimize()
option (on table or partition) we display the following info to the user 

"Table does not support optimize, doing recreate + analyze instead".

FIX
---

It was decided for GA versions(5.1 and 5.5) whenever the user tries to 
optimize a partition(s) we will will display the following info the user

"Table does not support optimize on partitions.
All partitions will be rebuilt and analyzed."

Earlier partitions were not analyzed.Now all partitions  will be analyzed.  

If the user wants to optimize the whole table ,we will display the
previous info to the user. i.e

"Table does not support optimize, doing recreate + analyze instead"

For 5.6+ versions we will raise a new bug to support optimize() options
in innodb.

Add missing DBUG_RETURNs, otherwise the debug-stack gets messed up,
and _db_enter_ and _db_exit_ will access data outside the current stack frame.

              TO 'MYISAM_SORT_BUFFER_SIZE'
Problem: 'myisam_sort_buffer_size' is a parameter used by 
mysqld program only whereas 'sort_buffer_size' is used by
mysqld and myisamchk programs. But the error message printed
when myisamchk program is run with insufficient buffer size 
is myisam_sort_buffer_size is too small which may mislead to the
server parameter myisam_sort_buffer_size.
SOLUTION: A parameter 'myisam_sort_buffer_size' is added as an
alias for 'sort_buffer_size' and the 'sort_buffer_size' parameter
is marked as deprecated. So myisamchk also has both the parameters
with the same role.

               main.mysqlbinlog_row_innodb are skipped by mtr

=== Problem ===

The following tests are wrongly placed in main suite and as a
result these are not run with proper binlog format combinations.
Some are always skipped by mtr.
1) mysqlbinlog_row_myisam
2) mysqlbinlog_row_innodb
3) mysqlbinlog_row.test
4) mysqlbinlog_row_trans.test
5) mysqlbinlog-cp932
6) mysqlbinlog2
7) mysqlbinlog_base64

=== Background ===

mtr runs the tests placed in main suite with binlog format=stmt.
Those that need to be tested against binlog format=row or mixed
or more than one binlog format and require only one mysql server
are placed in binlog suite. mtr runs tests in binlog suite with
all three binlog formats(stmt,row and mixed).

=== Fix ===


1) Moved the test listed in problem section above to binlog suite.
2) Added prefix "binlog_" to the name of each test case moved.
   Renamed the coresponding result files and option files accordingly. 

No commit message

IN ALTER TABLE ... ADD UNIQUE KEY

A bogus debug assertion failure occurred when reporting a duplicate
key on a column prefix of a CHAR column.

This is a regression from Bug#14729221 IN-PLACE ALTER TABLE REPORTS ''
INSTEAD OF REAL DUPLICATE VALUE FOR PREFIX KEYS. The assertion is only
present when UNIV_DEBUG is defined (which it is in debug builds
starting from MySQL 5.5). It is a case of overasserting.

Fix approved by Inaam Rana on IM.

Moved explicit instantiation of available_buffer and valid_buffer_range 
template functions to sql/log_event.cc.

Merge bundle on mysql-5.1.

Problem:-
When we execute a query which has subquery with GROUP BY, ORDER BY and have a
BLOB column,results a memory leak.

Analysis:-
In case of subquery, which have GROUP BY on BLOB and a ORDER BY on other field
and BLOB is not a key. We allocate a tmp buffer to copy_field to take care of
BLOB value.This copy_field value can have copies of its in two join(objects),
so while freeing this copy_field we have to take care that it is
not deleted twice.
The double deletion of tmp_table_param.copy_field is handled by two patches.

One by Kostja :
revid:sp1r-konstantin@mysql.com-20050627101056-55153
Fix the broken test suite in -debug build.

and other by Oleksandr
revid:sp1r-bell@sanja.is.com.ua-20060118114857-19905
Excluded posibility of tmp_table_param.copy_field double deletion (BUG#14851).

both of this patches are commited in different branch and while
merging they both get placed,but there is no need for Kostja patch as Oleksandr
patch handle this.

LEN <= SIZEOF(ULONGLONG)

This bug was caught in the WL#6255 ALTER TABLE...ADD COLUMN in MySQL
5.6, but there is a bug in all InnoDB versions that support
auto-increment columns.

row_search_autoinc_read_column(): When reading the maximum value of
the auto-increment column, and the column only contains NULL values,
return 0. This corresponds to the case when the table is empty in
row_search_max_autoinc().

rb:1415 approved by Sunny Bains

mysqld_safe script did not heed MySQL specific environment variable
$UMASK, leading to divergent behavior between mysqld and mysqld_safe.

Patch adds an approximation of mysqld's behavior to mysqld_safe,
within the bounds dictated by attempt to have mysqld_safe run on
even the most basic of shells (proper '70s sh, not just bash
with a fancy symlink).

Patch also adds approximation of said behavior to mysqld_multi
(in perl).

(backport)

rb://1334
approved by: Inaam Rana

mysqld_safe script did not heed MySQL specific environment variable
$UMASK, leading to divergent behavior between mysqld and mysqld_safe.

Patch adds an approximation of mysqld's behavior to mysqld_safe,
within the bounds dictated by attempt to have mysqld_safe run on
even the most basic of shells (proper '70s sh, not just bash
with a fancy symlink).

Patch also adds approximation of said behavior to mysqld_multi
(in perl).

Problem:-
using last_insert_id() on an auto_incremented bigint unsigned does
not work for values which are greater than max-bigint-signed.

Analysis:-
last_insert_id() returns the first auto_incremented value for a column
and an auto_incremented value can have only positive values.

In our code, when we are initializing a last_insert_id object, we are
taking it as a signed BIGINT, So when the auto_incremented value reaches
greater than max signed bigint, last_insert_id gives negative result.

Solution:
When we are fetching the value from last_insert_id, We are setting the 
unsigned_flag, so that it take only unsigned BIGINT value.

REAL DUPLICATE VALUE FOR PREFIX KEYS

innobase_rec_to_mysql(): Invoke dict_index_get_nth_col_or_prefix_pos()
instead of dict_index_get_nth_col_pos() to find the column.

bug#14704286
SECONDARY INDEX UPDATES MAKE CONSISTENT READS DO O(N^2) UNDO PAGE
LOOKUPS (honoring kill query while accessing sec_index)

If secondary index is being used for select query evaluation and this
query is operating with consistent read snapshot it might take good time for
secondary index to return back control to mysql as MVCC would kick in.

If user issues "kill query <id>" while query is actively accessing
secondary index it will not be honored as there is no hook to check
for this condition. Added hook for this check.

-----
Parallely secondary index taking too long to evaluate for consistent
read snapshot case is being examined for performance improvement. WL#6540.

This fix resolves a security vulnerability of SHOW PROFILE.

See the bug report for details.

This bug had two problems:
 P1) Reads out of bounds;
 P2) Writes out of bounds.

PROBLEM P1
----------
User_var_log_event unmarshalling from binlog was not performing range
checks when using name_len and val_len variables to walk on event
buffer.

Added range checks to User_var_log_event unmarshalling to prevent
unmarshalling errors.

PROBLEM P2
----------
User_var_log_event value was allocated on thread stack, what caused
stack frame errors when User_var_log_event value was bigger than thread
stack size.

Currently value is allocated on heap memory.

os/os0file.c:1332: error: ISO C90 forbids mixed declarations and code

although the bug does not exist in 5.1/innodb.

The problem is in the error handling in row_create_table_for_mysql().
In the 'disk full' case we may forget to call dict_mem_table_free() on
the table object.

Approved by:	Marko (rb:1377 and rb:1386)

We did not allocate enough bits for index->trx_id_offset, causing an
UPDATE or DELETE of a table with a PRIMARY KEY longer than 1024 bytes
to corrupt the PRIMARY KEY.

dict_index_t: Allocate enough bits.

dict_index_build_internal_clust(): Check for overflow of
index->trx_id_offset. Trip a debug assertion when overflow occurs.

rb:1380 approved by Jimmy Yang

n_child_sum_items kept increasing.
Since it is used for calculating the size of ref_pointer_array,
we will allocate larger and larger chunks of memory, until we hit some
operating system limit.
The memory is free()d at disconnect, but is most likely *not*
returned to the operating system.

TRANSACTION ROLLBACK

Description:  During the rollback operation, a blob page 
is removed earlier than desired.  Consider following scenario:

1. create table t1(a int primary key,b blob) engine=innodb;
2. insert into t1 values (1,repeat('b',9000));
3. begin;
4. update t1 set b=concat(b,'b');
5. update t1 set a=a+1;
6. insert into t1 values (1,repeat('b',9000));
7. rollback;

The update operation in line 5 produces 2 undo log record. The first
undo record (TRX_UNDO_DEL_MARK_REC) goes to trx->update_undo and the
second undo record (TRX_UNDO_INSERT_REC) goes to trx->insert_undo.
During rollback, they are executed out of order.

When the undo record TRX_UNDO_DEL_MARK_REC is applied/executed,
the blob ownership is also reset.  Because of this the blob page
is released earlier than desired.  This blob page must have been
freed only as part of applying/executing the undo record
TRX_UNDO_INSERT_REC.

This problem can be avoided by executing the undo records in
order.  This patch will make innodb to execute the undo records
in order.

rb://1125 approved by Marko.

No commit message

```--------
After compiling from source, during make test I got the following error:

test main.loaddata failed with error
CURRENT_TEST: main.loaddata
mysqltest: At line 592: query 'LOAD DATA INFILE 'tmpp.txt' INTO TABLE t1
CHARACTER SET ucs2
(@b) SET a=REVERSE(@b)' failed: 1115: Unknown character set: 'ucs2'

I noticed other tests are skipped because of no ucs2
main.mix2_myisam_ucs2                    [ skipped ]  Test requires:'
have_ucs2'

Should main.loaddata be skipped if there is no ucs2

How To Repeat:
```

----------
Run make test on compiled source that doesn't have ucs2

Suggested fix:
-------------
the failing piece of the test should be moved from mysql-test/t/loaddata.test to
mysql-test/t/ctype_ucs.test.

Bug #11764313 57135: CRASH IN ITEM_FUNC_CASE::FIND_ITEM WITH CASE WHEN
Bug #11764818 57692: Crash in item_func_in::val_int() with ZEROFILL

No commit message

No commit message

When a client connects to a MySQL server, first a THD object is created.
If there are any idle server threads waiting, the THD object is then added
to a list and a server thread is woken up. This thread then retrieves the 
THD object from the list and starts executing.

The problem was that this list of THD objects waiting for a server thread,
was not working in a FIFO fashion, but rather LIFO. This is unfair, as it means
that the last THD added (=last client connected) will be assigned a  server 
thread first.

Note however that for this to be a problem, several clients must be able
to connect and have THD objects constructed before any server threads
manages to be woken up. This is not a very likely scenario.

This patch fixes the problem by changing the THD list to work FIFO
rather than LIFO.

This is the 5.1/5.5 version of the patch.