FORMAT_DESCRIPTION_LOG_EVENT::CALC_SERVER_VERSION_SPLIT

Problem: When reading a Format_description_log_event, it supposes MySQL
version is always valid and DBUG_ASSERTION is used check the version number.
However, user may give a wrong binlog offset, even give a faked binary event
which includes an invalid MySQL version. This will cause server crash.

Fix: The assertions are removed and an error will be reported if MySQL
version in Format_description_log_event is invalid.

                           IN DEACTIVATE_DDL_LOG_ENTRY

Update of comments according to reviewers request.

revid that is being reverted: marko.makela@oracle.com-20121128070024-hb56t41limja8edz

    frac is the number of decimal digits after the point
For each multiplication in the expression, decimal_mul() does this:
  to->frac= from1->frac + from2->frac;              /* store size in digits */
which will eventually overflow.
The code for handling the overflow, will truncate the two digits in "1.75" to "1"

Solution:
Truncate to 31 significant fractional digits, when doing decimal multiplication.

LESS COLUMNS THAN MASTER

Problem:
========
If DML operation requires a converstion at slave and if slave contains
less number of columns than master, slave is crashing.

Fix:
====
When Slave applies any DML operation, it sees if any of the columns 
requires conversion. If yes, it creates conversion table. 
While creating the coversion table, it should look into the actual number 
of columns required to create the table instead of getting the number
of columns from Master (size()). Columns would have dropped or added
at Slave. So the value should be min(columns@master, columns@slave)

Description: Null merge.

Description: A very large database name causes buffer
             overflow in functions acl_get() and
             check_grant_db() in sql_acl.cc. It happens
             due to an unguarded string copy operation.
             This puts required sanity checks before
             copying db string to destination buffer.

No commit message

The converted implicit lock should wait for the prior conflicting lock if found.

rb://1437 approved by Marko

The converted implicit lock should wait for the prior conflicting lock if found.

rb://1437 approved by Marko

BUF_PAGE_GET_GEN REDUNDANT?

buf_page_get_gen(): When decompressing a compressed page that had
already been accessed in the buffer pool, do not attempt to merge
buffered changes.

rb:1602 approved by Inaam Rana

 trx_undo_prev_version_build() should confirm existence of inherited (not-own) external pages.

Bug #14676084 : ROW_UNDO_MOD_UPD_DEL_SEC() DOESN'T NEED UNDO_ROW AND UNDO_EXT INITIALIZED
 mtr script could hit the assertion error !bpage->file_page_was_freed using this path.
 So, also fixed

rb://1337 approved by Marko Makela.

 trx_undo_prev_version_build() should confirm existence of inherited (not-own) external pages.

Bug #14676084 : ROW_UNDO_MOD_UPD_DEL_SEC() DOESN'T NEED UNDO_ROW AND UNDO_EXT INITIALIZED
 mtr script could hit the assertion error !bpage->file_page_was_freed using this path.
 So, also fixed

rb://1337 approved by Marko Makela.

Description: Null merge from 5.1 to 5.5

Description: Updated yassl to version 2.2.2

When a binlog is replayed into a server, e.g.:
  $ mysqlbinlog binlog.000001 | mysql
it sets a pseudo slave mode on the client connection in order to server
be able to read binlog events, there is, a format description event is
needed to correctly read following events.
Also this pseudo slave mode applies to the current connection
replication rules that are needed to correctly apply binlog events.

If a binlog dump is sourced on a connection, this pseudo slave mode will
remains after it, what will apply unexpected rules from customer
perspective to following commands.

Added a new SET statement to binlog dump that will unset pseudo slave
mode at the end of dump file.

                   MYSQLDUMP OUTPUT
      
      A patch is pushed on this bug. A result mismatch
      occured for the test main.ddl_i18n_utf8 in
      x86_64 gcov build of linux in pb2. This commit is
      to modify ddl_i18n_utf8.result to match the
      changes made for the bug.

             MYSQLDUMP OUTPUT

A patch is pushed on this bug. A result mismatch
occured for the test main.ddl_i18n_koi8r in
x86_64 gcov build of linux in pb2. This commit is
to modify ddl_i18n_koi8r.result to match the
changes made for the bug.

             MYSQLDUMP OUTPUT

Problem: mysqldump when used with option --routines, dumps
         all the routines of the specified database into
         output. The statements in this output are written
         in such a way that they are version safe using C
         style version commenting (of the format
         /*!<version num> <sql statement>*/). If a semicolon
         is present right before closing of the comment in
         dump output, it results in a syntax error while
         importing.


Solution: Version comments for dumped routines are
          specifically to protect the ones older than 5.0.
          When the import is done on 5.0 or later versions,
          entire create statement gets executed as all the
          check conditions at the beginning of the comments
          are cleared. Since the trade off is between the
          performance of newer versions which are more in
          use and protection of very old versions which are
          no longer supported, it is proposed that these
          comments be removed altogether to maintain
          stability of the versions supported.

This bug is fixed by Bug#14251529. Only testcase from the 
contribution is used.

rb://1546
approved by: Sunny Bains and Marko Makela

Our dealing of buf_page_t::access_time flag is inaccurate.
* If LRU eviction has not started we don't set the access_time
* If LRU eviction is started we set it only if the block is not
'too old'.
* Not a correctness issue but we hold buf_pool::mutex when
setting the flag

This patch fixes this by:
* Setting flag unconditionally whenever the first page access happens
* Use buf_page_t mutex to protect write to the flag

              INC_HOST_ERRORS() IS CALLED.

Description: Null merge from 5.1 to 5.5

No commit message