Fixing the 5.5 part (the 5.6 part will go in a separate commit soon).

Problem:
  Item_direct_ref::get_date() incorrectly calculated its "null_value",
  which made UNIX_TIMESTAMP(view_column) incorrectly return NULL
  for a NOT NULL view_column.

Fix:
  Make Item_direct_ref::get_date() calculate null_value
  in the similar way with the other methods 
  (val_real,val_str,val_int,val_decimal):
  copy null_value from the referenced Item.

modified:
  mysql-test/r/func_time.result
  mysql-test/t/func_time.test
  sql/item.cc

                     routines.

mysqldump in xml mode did not dump routines, events or
triggers.

This patch fixes this issue by fixing the if conditions
that disallowed the dump of above mentioned objects in
xml mode, and added the required code to enable dump
in xml format.

Moving query_cache_size_basic_32.test and query_cache_size_basic_64.test from experimental
to disabled as a solution has still not been found.

If we meet DB_TOO_MANY_CONCURRENT_TRXS during the execution tab_create_graph from row_create_table_for_mysql(), .ibd file for the table should be created already but was not deleted for the error handling.

rb:875 approved by Jimmy Yang

If we meet DB_TOO_MANY_CONCURRENT_TRXS during the execution tab_create_graph from row_create_table_for_mysql(), .ibd file for the table should be created already but was not deleted for the error handling.

rb:875 approved by Jimmy Yang

Null merge from  5.1 for Bug 12872803 - 62154: FEDERATED.FEDERATED_SERVER TEST FAILS WITH RUN --REPEAT=2

Fixed it to work with "--repeat" option.

Fixed the testcase using timestamp logic while doing grep from the error file.

Fixed the testcase using timestamp logic while doing grep from the error file.

Use new syntax to mask different error output in affected tests

If init_command was incorrect, we couldn't let users execute
queries, but we couldn't report the issue to the client either
as it does not expect error messages before even sending a
command. Thus, we simply disconnected them without throwing
a clear error.

We now go through the proper sequence once (without executing
any user statements) so we can report back what the problem
is. Only then do we disconnect the user.

As always, root remains unaffected by this as init_command is
(still) not executed for them.

Port vasil.dimov@oracle.com-20111205083046-jtgi1emlvtfnjatt from mysql-trunk

Port vasil.dimov@oracle.com-20111205082900-lx9om1joscejr25e from mysql-trunk

Port vasil.dimov@oracle.com-20111205082831-7v1qu50hvd9hjr3g from mysql-trunk

Port vasil.dimov@oracle.com-20111205082756-wtlg8isyn4yohyny from mysql-trunk

Port vasil.dimov@oracle.com-20111205082626-87j5f48dq1ouk86r from mysql-trunk

InnoDB: Remove HAVE_purify, UNIV_INIT_MEM_TO_ZERO, UNIV_SET_MEM_TO_ZERO.

The compile-time setting HAVE_purify can mask potential bugs.
It is being set in PB2 Valgrind runs. We should simply get rid of it,
and replace it with UNIV_MEM_INVALID() to declare uninitialized memory
as such in Valgrind-instrumented binaries.

os_mem_alloc_large(), ut_malloc_low(): Remove the parameter set_to_zero.

ut_malloc(): Define as a macro that invokes ut_malloc_low().

buf_pool_init(): Never initialize the buffer pool frames. All pages
must be initialized before flushing them to disk.

mem_heap_alloc(): Never initialize the allocated memory block.

os_mem_alloc_nocache(), ut_test_malloc(): Unused function, remove.

rb:813 approved by Jimmy Yang

The rpl.rpl_known_bugs_detection fails on pb2 as warnings were found in the
mysqld log file. We fix this problem by suppressing the warning.

             --FLUSH-LOG BREAKS CONSISTENCY

Post-fix for some failing tests.

             --FLUSH-LOG BREAKS CONSISTENCY

The transaction started by mysqldump gets committed
implicitly when flush-log is specified along with
single-transaction option, and hence can break
consistency.

This is because, COM_REFRESH is executed in order
to flush logs and starting from 5.5 this command
performs an implicit commit.

Fixed by making sure that COM_REFRESH is executed
before the transaction has started and not after it.

Note : This patch triggers following behavioral
       changes in mysqldump :

1) After this patch we no longer flush logs before
   dumping each database if --single-transaction
   option is given like it was done before (in the
   absence of --lock-all-tables and --master-data
   options).

2) Also, after this patch, we start acquiring
   FTWRL before flushing logs in cases when only
   --single-transaction and --flush-logs are given.
   It becomes safe to use mysqldump with these two
   options and without --master-data parameter for
   backups.

COMMUNICATION PACKETS, ERROR_CODE: 1160

Addendum: for some queries table->in_use might be NULL -
check it.

COMMUNICATION PACKETS, ERROR_CODE: 1160

If idle FEDERATED table is evicted from the table cache when 
a connection to remote server is lost, query that initiated 
eviction may fail.
If this query is executed by slave SQL thread it may fail as well.

An error of close was stored in diagnostics area, which was later
attributed to the statement that caused eviction.

With this patch FEDERATED clears an error of close.

An extra space was inserted in the code by mistake which was producing a result content mismatch.

unix_timestamp() is implemented in this part of the code in place of current_time().
Also, since the pb2 machines may be extremely fast, instead of looping through the code,
we use sleep(1.1) so that the variables t0 and t1 have different values.

rb://865
approved by: Jimmy

Integer overflow causes division by zero.

THE ORACLE_WELCOME_COPYRIGHT_NOTICE TWICE.

Fix of a merge error.

Unix_timestamp for time comparison has some problems...Re-using current_time for 
time comparison.

The time comparison using current_time() stored in an int variable was giving wrong results as 
the current_time() format as an int implementation has been changed in mysql-trunk but not in mysql-5.5.

The time is stored in the format hh:mm:ss as 'time' datatype.But as an int, it is stored as hhmmss,
but only on the trunk. On mysql-5.5,as an int, it is stored as hh.
Hence, the current_time() function has been changed to unix_timestamp() function.