FREED LOCK

ANALYIS
-------

In 5.5 code the lock_rec_block_validate() is called after releasing
the kernel mutex. There is a chance that the lock might be invalid so,
we are getting the valgrind error on invalid read on lock->index.

FIX
---

Fix would be to copy the lock->index when we are holding the kernel mutex 
and then pass it to the lock_rec_block_validate(). This implementation
is present in 5.1 code.  

[ Approved by sunny rb.no.oracle.com/rb/r/2152/ ]

Description: Null merge from 5.1.

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COLUMNS ARE USED INSIDE A STORED PROCEDURE                                      
                                                                                
Problem: When 'SET' type columns are used in a DML                              
inside a stored procedure and a NULL value is passed                            
to that column, replication is breaking.                                        
                                                                                
Analysis: All stored procedure variables used inside                            
a DML will be substituted with NAME_CONST functions.                            
While NAME_CONST are used in this particular scenario,                          
i.e., when NULL value is passed then charset is copied                          
from 'empty_set_string' member of Field_set class.                              
The operator '=' overload method inside 'String' class                          
is not coping str_charset from R.H.S object to L.H.S object.                    
Hence charset is wrongly copied in the string assignment                        
                                                                                
Fix: Handle coping str_charset member in operator '=' overload                  
method.

COLUMNS ARE USED INSIDE A STORED PROCEDURE                                      
                                                                                
Problem: The operator '=' overload method inside
'String' class is not coping str_charset member from
R.H.S object to L.H.S object. Hence charset is wrongly
set while using string assignments

Analaysis: The above mentioned problem is
identified while doing the analaysis of bug#14593883.
Though the test scenario mentioned in the bug page
is not  an issue in mysql-5.1 code, the actual root cause
ie., "str_charset member is not copied" exists in the 
mysql-5.1 code base. 

Fix: Handle coping str_charset member in operator '=' overload                  
method.

IBUF, FREE SPACE MANAGEMENT

ibuf_merge_or_delete_for_page(): Declare the user index page latched
for UNIV_SYNC_DEBUG after opening the change buffer cursor. This
should avoid the bogus latching order violation.

ibuf_delete_rec(): Add assertions to the callers, checking that the
mini-transaction was committed when the function returned TRUE. This
is a non-functional change, just clarifying the code.

rb#2136 approved by Kevin Lewis

For a fresh insert, page_zip_available() was counting some fields twice.
In the worst case, the compressed page size grows by PAGE_ZIP_DIR_SLOT_SIZE
plus the size of the record that is being inserted. The size of the record
already includes the fields that will be stored in the uncompressed portion
of the compressed page.

page_zip_get_trailer_len(): Remove the output parameter entry_size,
because no caller is interested in it.

page_zip_max_ins_size(), page_zip_available(): Assume that the page grows
by PAGE_ZIP_DIR_SLOT_SIZE and the record size (which includes the fields
that would be stored in the uncompressed portion of the page).

rb#2169 approved by Sunny Bains

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The check for unsigned time_t failed, on all platforms, due to missing #include.

from CMakeFiles/CMakeError.log
with this patch: error: size of array array is negative
without this patch: error: time_t undeclared (first use in this function)

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               MEM_HEAP_CREATE_BLOCK() 

PROBLEM
-------

If we give start mysqld with the option --innodb_log_buffer_size=50GB
,then  mem_area_alloc() function fails to allocate memory and returns
NULL.In debug version we assert at this point,but there is no check in
release version and we get a segmentation fault.

FIX
---
Added a log message saying that we are unable to allocate memory.
After this message we assert.

[Approved by Kevin http://rb.no.oracle.com/rb/r/2065 ]

Don't use CMAKE_OSX_ARCHITECTURES to determine DEFAULT_MACHINE
if it is not defined.

If we're 64bit, then use "x86_64" rather than "x86"

PROBLEM: If multiple statements are sent by a single
         request then only the last statement was
         getting logged. An attacker can bypass the
         audit log just by sending two comsecutive
         statements in one request.

SOLUTION: Each statements from a single request are
          logged.

INSERT WITH SAME VALUES

Problem:

When a transaction is in READ COMMITTED isolation level, gap locks are still
taken in the secondary index, when row is inserted.  This happens when the
secondary index is scanned for duplicate.  

The function row_ins_scan_sec_index_for_duplicate() always calls the 
function row_ins_set_shared_rec_lock() with LOCK_ORDINARY irrespective of
the transaction isolation level.

Solution:

The function row_ins_scan_sec_index_for_duplicate() calls the 
function row_ins_set_shared_rec_lock() with LOCK_ORDINARY or 
LOCK_REC_NOT_GAP based on the transaction isolation level.

rb://2035 approved by Krunal and Marko

Approved by: Marko Makela (patch in bug report)

Reduce the number of debug buf_validate() calls

Fixing post push issue
Simulator name used needs to be changed to make it
work properly.

Analysis: 
Debug control list addition (ListAddDel function
dbug.c file) code was written in such a way that
if new element is subset of already existing element,
then the new element is not added.
i.e., set @@global.debug = '+d,abcd', is existing in
the list then you cannot add "a" or "ab" or "abc"
in the list.

              PROBLEM AFTER MYSQL_HA_FIND

This problem occured if a prepared statement tried to create a table
for which there already existed a view with the same name while a
SQL handler was opened.

Before DDL statements are executed, mysql_ha_rm_tables() is called
to remove any matching tables from the internal list of opened SQL
handler tables. This match was done on TABLE_LIST::db and 
TABLE_LIST::table_name. This is problematic for views (which use
TABLE_LIST::view_db and TABLE_LIST::view_name) and anonymous
derived tables.

This patch fixes the problem by skipping TABLE_LISTs representing
anonymous derived tables and using get_db_name()/get_table_name()
which handles views when looking for SQL handler tables to remove.

Before this fix, the command
  SHOW ENGINE PERFORMANCE_SCHEMA STATUS
could report wrong amount of memory allocated,
when the amount of memory used exceeds 4GB.

The problem is that size computations are not done using size_t,
so that overflows do occur, truncating the results.

This fix compute memory sizes properly with size_t.

Tested manually.

No test script provided, as the script would need to allocate too much 
memory for the test.

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IN IN-CLAUSE USING MYISAM OR MEMORY ENGINE

Backport from 5.6. Original message:

The coincidences caused a data loss:
* The query has IN subqueries nested twice,
* the WHERE clause of the inner subquery refers to the
  outer field, and the whole WHERE clause returns FALSE,
* the inner subquery has a LEFT JOIN that joins a single
  row with a row of NULLs; one of that NULL columns
  represents the select list of the subquery.

Normally, that inner subquery should return empty record set.
However, in our case:
* the Item_is_not_null_test item goes constant, since
  its underlying field is NULL (because of LEFT JOIN ... ON 
  FALSE of const table row with a row of nulls);
* we evaluate Item_is_not_null_test::val_int() as a part
  of fake HAVING expression of the transformed subquery;
* as far as the underlying field is NULL, we optimize
  out the whole fake HAVING expression as FALSE as well
  as a whole subquery with a zero result:
  Impossible HAVING noticed after reading const tables";
* thus, the optimizer ignores the presence of the WHERE
  clause (the WHERE expression is FALSE in our case, so
  the subquery should return empty set);
* however, during the evaluation of the 
  Item_is_not_null_test::val_int() in the optimizer,
  it marked its "owner" with the "was_null" flag -- that
  forced the subquery to return UNKNOWN instead of empty
  set.
That caused a wrong result.


The problem is a regression of the small cleanup in
the fix for the bug11827369 (the Item_is_not_null_test part)
that conflicts with optimizations in the fix for the bug11752543.
Before that regression the Item_is_not_null_test items
never were constants.

The fix is the rollback of Item_is_not_null_test parts
of the bug11827369 fix.

This is a deadlock that will also be fixed in the server by
Bug #11844915 - HANG IN THDVAR MUTEX ACQUISITION.
So this is a simple alternate method of fixing the same problem,
but from within InnoDB.

The simple change is to make rename table start a transaction
before locking dict_sys->mutex since thd_supports_xa() can call
THDVAR which can lock a mutex, LOCK_global_system_variables, that
is used in the server by many other activities.  At least one of
those, sys_var::update(), can call back into InnoDB and try to
lock dict_sys->mutex while holding LOCK_global_system_variables.

The other bug fix for 11844915 eliminates the use of
LOCK_global_system_variables for calls to THDVAR.

Approved by marko in http://rb.no.oracle.com/rb/r/2000/

page_zip_compress_node_ptrs(): Do not attempt to invoke deflate() with
c_stream->avail_in, because it will result in Z_BUF_ERROR (and
page_zip_compress() failure and unnecessary further splits of the node
pointer page). A node pointer record can have empty payload, provided
that all key fields are empty.

Approved by Jimmy Yang

              GRANT STATEMENT

Description: Merge from 5.1.

              GRANT STATEMENT

Description: A missing length check causes problem while
             copying source to destination when
             lower_case_table_names is set to a value
             other than 0. This patch fixes the issue
             by ensuring that requried bound check is
             performed.

1.  remove dummy.bak
2.  create a db.opt file containing two lines:

---
default-character-set=latin1
default-collation=latin1_swedish_ci

ANALYSIS
--------
 
When we open the view using open_new_frm() ,it doesnt set the
table-list->table variable and any access to table_list->table 
will cause a crash.
 
FIX
---
 
Added a check during execution of the alter partition to return 
error if table is view.

[http://rb.no.oracle.com/rb/r/2001/  Approved by Mattias J ]

                                                TO EXPECT FILE

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