UPDATES

After checking that the table has changed too much in
row_update_statistics_if_needed() and calling dict_update_statistics(),
also check if the same condition holds after acquiring the table stats
latch. This is to avoid multiple threads concurrently entering and
executing the stats update code.

Approved by:	Marko (rb:2186)

Problem:
=======
Found using AddressSanitizer testing.

The mysqlbinlog utility may result in out-of-bound heap
buffer reads and thus, undefined behaviour, when processing
RBR events in the old (pre-5.1 GA) format.

The following code in process_event() would only be correct
if Rows_log_event was the base class for
Write,Update,Delete_rows_log_event_old classes:

    case PRE_GA_WRITE_ROWS_EVENT:
    case PRE_GA_DELETE_ROWS_EVENT:
    case PRE_GA_UPDATE_ROWS_EVENT:
...
        Rows_log_event *e= (Rows_log_event*) ev;
        Table_map_log_event *ignored_map=
          print_event_info->m_table_map_ignored.get_table(e->get_table_id());
...
        if (e->get_flags(Rows_log_event::STMT_END_F))
        {
...
        }

However, Rows_log_event is only the base class for the
Write,Update_Delete_rows_event family of classes, but not
for their *_old counterparts. So the above typecasts are
incorrect for the old-format RBR events and may result (and
do result according to AddressSanitizer reports) in reading
memory outside of the previously allocated on heap buffer.

Fix:
===
The above mentioned invalid type cast has been replaced with
appropriate old counterpart.

Note:The above mentioned issue is present only mysql-5.1 and
5.5. This is fixed in mysql-5.6 and above as part of 
Bug#55790. Hence few of the relevant changes of Bug#55790 are
being back ported to fix the current issue.

	
	Backport the changes for bug#14786792 which is regression 
	of fix for bug#11761854.So backported both changes.

  INTERACTIVE MODE

In interactive mode, libedit/readline allocates memory
for every new line entered & later the allocated memory
never gets freed.

Fixed by freeing the allocated memory blocks appropriately.

Null merge from mysql-5.1

Back porting fix from mysql-5.5

We need to take 'n_sum_items' into the calculation
when allocating the ref_ptr_array.

Item_func_group_concat::copy_or_same() creates a copy of original object.
It also creates a copy of ORDER structure because ORDER struct elements may
be modified in find_order_in_list() called from Item_func_group_concat::setup().
As ORDER copy is created using memcpy, ORDER::next elements point to original
ORDER structs. Thus find_order_in_list() called from EXECUTE stmt modifies
ordinal ORDER item pointers so they point to runtime items, these items are
freed after execution, so original ORDER structure becomes invalid.
The fix is to properly update ORDER::next fields so that they point to
new ORDER elements.

COLUMNS ARE USED INSIDE A STORED PROCEDURE 
Merging post-push fix from mysql-5.1

COLUMNS ARE USED INSIDE A STORED PROCEDURE

Post-push fix.
String::operator=() in client/sql_string.h also 
needs to be updated with fix.

             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.

No commit message

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

No commit message

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)

No commit message

No commit message

               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.