THOUGH IT IS NOT.

The following error message is misleading because it claims 
that the BLOB space is not counted.  

"ERROR 1118 (42000): Row size too large. The maximum row size for 
the used table type, not counting BLOBs, is 8126. You have to 
change some columns to TEXT or BLOBs"

When the ROW_FORMAT=compact or ROW_FORMAT=REDUNDANT is used,
the BLOB prefix is stored inline along with the row.  So 
the above error message is changed as follows depending on
the row format used:

For ROW_FORMAT=COMPRESSED or ROW_FORMAT=DYNAMIC, the error
message is as follows:

"ERROR 42000: Row size too large (> 8126). Changing some
columns to TEXT or BLOB may help. In current row format, 
BLOB prefix of 0 bytes is stored inline."

For ROW_FORMAT=COMPACT or ROW_FORMAT=REDUNDANT, the error
message is as follows:

"ERROR 42000: Row size too large (> 8126). Changing some
columns to TEXT or BLOB or using ROW_FORMAT=DYNAMIC or 
ROW_FORMAT=COMPRESSED may help. In current row
format, BLOB prefix of 768 bytes is stored inline."

rb://1252 approved by Marko Makela

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PAGE SPLIT

page_rec_get_nth_const(): Map nth==0 to the page infimum.

btr_compress(adjust=TRUE): Add a debug assertion for nth>0. The cursor
should never be positioned on the page infimum.

btr_index_page_validate(): Add test instrumentation for checking the
return values of page_rec_get_nth_const() during CHECK TABLE, and for
checking that the page directory slot 0 always contains only one
record, the predefined page infimum record.

page_cur_delete_rec(), page_delete_rec_list_end(): Add debug
assertions guarding against accessing the page slot 0.

page_copy_rec_list_start(): Clarify a comment about ret_pos==0.

rb:1248 approved by Jimmy Yang

ha_innodb::records_in_range(): Remove a debug assertion
that prohibits an open range (full table).

The patch by Jorgen Loland only removed the assertion from the
built-in InnoDB, not from the InnoDB Plugin.

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The use of Thread_iterator did not work on windows (linking problems).
Solution: Change the interface between the thread_pool and the server
to only use simple free functions.

This patch is for 5.5 only (mimicks similar solution in 5.6)

ha_innobase::records_in_range(): Remove a debug assertion
that prohibits an open range (full table).
This assertion catches unnecessary calls to this method, 
but such calls are not harming correctness.

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Backport from mysql-5.6 the fix
(revision-id sunny.bains@oracle.com-20120315045831-20rgfa4cozxmz7kz)

  Bug#13839886 - CRASH IN INNOBASE_NEXT_AUTOINC
  
  The assertion introduce in the fix for Bug#13817703 
  is too strong, a negative  number can be greater 
  than the column max value, when the column value is
  a negative number.
  
  rb://978 Approved by Jimmy Yang.

rb:1236 approved by Marko Makela

              ENABLE AUDI PLUGIN WHEN DDL
              OPERATION HAPPENING

PROBLEM: While unloading the plugin, state is
         not checked before it is to be reaped.
         This can lead to simultaneous free of
         plugin memory by more than one thread.
         Multiple deallocation leads to server
         crash. In the present bug two threads
         deallocate the alog_log plugin.

SOLUTION: A check is added to ensure that only
          one thread is unloading the plugin.

NOTE: No mtr test is added as it requires
      multiple threads to access critical
      section. debug_sync cannot be used in
      the current senario because we dont
      have access to thread pointer in
      some of the plugin functions. IMHO no
      test case in the current time frame.

NUMBERS

If a system variable was declared as deprecated without mention of an
alternative, the message would look funny, e.g. for @@delayed_insert_limit:

Warning 1287 '@@delayed_insert_limit' is deprecated and
will be removed in MySQL .

The message was meant to display the version number, but it's not
possible to give one when declaring a system variable.

The fix does two things:

1) The definition of the message
ER_WARN_DEPRECATED_SYNTAX_NO_REPLACEMENT is changed so that it does
not display a version number. I.e. in English the message now reads:

Warning 1287 The syntax '@@delayed_insert_limit' is deprecated and
will be removed in a future version.

2) The message ER_WARN_DEPRECATED_SYNTAX_WITH_VER is discontinued in
favor of ER_WARN_DEPRECATED_SYNTAX for system variables. This change
was already done in versions 5.6 and above as part of wl#5265. This
part is simply back-ported from the worklog.

WARNING

This patch is for mysql-5.5 only,
to be null-merged to mysql-5.6 and mysql-trunk.

This is a partial rollback of the file io instrumentation,
removing the instrumentation for mysql_file_stat in the archive engine.

See the bug comments for details.

             FAILED IN CHECK_LOCK_AND_ST

Problem:
--------
lock_tables() is supposed to invoke check_lock_and_start_stmt()
for TABLE_LIST which are directly used by top level statement.
TABLE_LIST->prelocking_placeholder is set only for TABLE_LIST
which are used indirectly by stored programs invoked by top
level statement. Hence check_lock_and_start_stmt() should have
TABLE_LIST->prelocking_placeholder==false always, but it is
observed that this assert fails.

The failure is found during RQG test rqg_signal_resignal.

Analysis:
---------
open_tables() invokes open_and_process_routines() where it
finds all the TABLE_LIST that belong to the routine and
adds it to thd->lex->query_tables. During this process if
the open_and_process_routines() fail for some reason,
we are supposed to chop-off all the TABLE_LIST found during
calls to open_and_process_routines(). But, in practice this
is not happening.

thd->lex->query_tables_own_last is supposed to point to a
node in thd->lex->query_tables, which would be a first
TABLE_LIST used indirectly by stored programs invoked by
top level statement. This is found to be not-set correctly
when we plan to chop-off TABLE_LIST's, when
open_and_process_routines() failed.

close_tables_for_reopen() does chop-off all the TABLE_LIST
added after thd->lex->query_table_own_last. This is invoked
upon error in open_and_process_routines(). This call would
not work as expected as thd->lex->query_tables_own_last
is not set, or is not set to correctly.

Further, when open_tables() restarts the process of finding
TABLE_LIST belonging to stored programs, and as the
thd->lex->query_tables_own_last points to in-correct node,
there is possibility of new iteration setting the
thd->lex->query_tables_own_last past some old nodes that
belong to stored programs, added earlier and not removed.
Later when open_tables() completes, lock_tables() ends up
invoking check_lock_and_start_stmt() for TABLE_LIST which
belong to stored programs, which is not expected behavior
and hence we hit the assert
TABLE_LIST->prelocking_placeholder==false.

Due to above behavior, if a user application tries to
execute a SQL statement which invokes some stored function
and if the lock grant on stored function fails due to a
deadlock, then mysqld crashes.

Fix:
----
open_tables() remembers save_query_tables_last which points
to thd-lex->query_tables_last before calls to
open_and_process_routines(). If there is no known
thd->lex->query_tables_own_last set, we are now setting
thd->lex->query_tables_own_last to save_query_tables_last.
This will make sure that the call to close_tables_for_reopen()
will chop-off the list correctly, in other words we now
remove all the nodes added to thd->lex->query_tables, by
previous calls to open_and_process_routines().

Further, it is found that the problem exists starting
from 5.5, due to a code refactoring effort related to
open_tables(). Hence, the fix will be pushed in 5.5, 5.6
and trunk.

Documentation for class Item_outer_ref was wrong:
(*ref) may point to Item_field as well
(see e.g. Item_outer_ref::fix_fields)

So this casting in get_store_key() was wrong:
(*(Item_ref**)((Item_ref*)keyuse->val)->ref)->ref_type()

HEURISTICS FOR COMPRESSED PAGE SIZE

The fix of Bug#12845774 was supposed to skip known-to-fail
btr_cur_optimistic_insert() calls. There was only one such call, in
btr_cur_pessimistic_update(). All other callers of
btr_cur_pessimistic_insert() would release and reacquire the B-tree
page latch before attempting the pessimistic insert. This would allow
other threads to restructure the B-tree, allowing (and requiring) the
insert to succeed as an optimistic (single-page) operation.

Failure to attempt an optimistic insert before a pessimistic one would
trigger an attempt to split an empty page.

rb:1234 approved by Sunny Bains

pre-push fix, removed unused variable.

DURING SERVER STARTUP

The options parser now correctly checks for ambiguous prefixes in 
enumerated variables and emits an error when the value supplied is
ambiguous.

No test added since mysql-test-run.pl can't handle server startup 
failures as an expected state.

Additional patch to remove the part_id -> ref_buffer offset.

The partitioning id and the associate record buffer can
be found without having to calculate it.

By initializing it for each used partition, and then reuse
the key-buffer from the queue, it is not needed to have
such map.

Facebook got a case where the page compresses really well so that
btr_cur_optimistic_update() returns DB_UNDERFLOW, but when a record
gets updated, the compression rate radically changes so that
btr_cur_insert_if_possible() can not insert in place despite
reorganizing/recompressing the page, leading to the assertion failing.

rb:1220 approved by Sunny Bains

COMPRESSED PAGE SIZE

This was submitted as MySQL Bug 61456 and a patch provided by
Facebook. This patch follows the same idea, but instead of adding a
parameter to btr_cur_pessimistic_insert(), we simply remove the
btr_cur_optimistic_insert() call there and add it to the only caller
that needs it.

btr_cur_pessimistic_insert(): Do not try btr_cur_optimistic_insert().

btr_insert_on_non_leaf_level_func(): Invoke btr_cur_optimistic_insert()
before invoking btr_cur_pessimistic_insert().

btr_cur_pessimistic_update(): Clarify in a comment why it is not
necessary to invoke btr_cur_optimistic_insert().

btr_root_raise_and_insert(): Assert that the root page is not empty.
This could happen if a pessimistic insert (involving a split or merge)
is performed without first attempting an optimistic (intra-page) insert.

rb:1219 approved by Sunny Bains

btr_cur_optimistic_insert(): Remove a bogus assertion. The insert may
fail after reorganizing the page.

btr_cur_optimistic_update(): Do not attempt to reorganize compressed pages,
because compression may fail after reorganization.

page_copy_rec_list_start(): Use page_rec_get_nth() to restore to the
ret_pos, which may also be the page infimum.

rb:1221

The buffer for the current read row from each partition
(m_ordered_rec_buffer) used for sorted reads was
allocated on open and freed when the ha_partition handler
was closed or destroyed.

For tables with many partitions and big records this could
take up too much valuable memory.

Solution is to only allocate the memory when it is needed
and free it when nolonger needed. I.e. allocate it in
index_init and free it in index_end (and to handle failures
also free it on reset, close etc.)

Also only allocating needed memory, according to
partitioning pruning.

Manually tested that it does not use as much memory and
releases it after queries.

Problem description:
mysqlhotcopy fails if a view presents in the database.

Analysis:
Before 5.5 'FLUSH TABLES <tbl_name> ... WITH READ LOCK' will able 
to get lock for all tables (i.e. base tables and view tables). 
In 5.5 onwards 'FLUSH TABLES <tbl_name> ... WITH READ LOCK' for 
'view tables' will not work, because taking flush locks on view 
tables is not valid.

Fix:
Take flush lock for 'base tables' and read lock for 'view table' 
separately.

Note: most of the patch has been backported from bug#13006947's patch