When values of different types are compared they're converted to a type that
allows correct comparison. This conversion is done for each comparison and
takes some time. When a constant is being compared it's possible to cache the
value after conversion to speedup comparison. In some cases (large dataset,
complex WHERE condition with many type conversions) query might be executed
7% faster.

A test case isn't provided because all changes are internal and isn't visible
outside.

The behavior of the Item_cache is changed to cache values on the first request
of cached value rather than at the moment of storing item to be cached.
A flag named value_cached is added to the Item_cache class. It's set to TRUE
when cache holds the value of the last stored item.
Function named cache_value() is added to the Item_cache class and derived classes.
This function actually caches the value of the saved item.
Item_cache_xxx::store functions now only store item to be cached and set
value_cached flag to FALSE.
Item_cache_xxx::val_xxx functions are changed to call cache_value function
prior to returning cached value if value_cached is FALSE.
The Arg_comparator::set_cmp_func function now calls cache_converted_constant
to cache constants if they need a type conversion.
The Item_cache::get_cache function is overloaded to allow setting of the
cache type.
The cache_converted_constant function is added to the Arg_comparator class.
It checks whether a value can and should be cached and if so caches it.

            only const tables

The problem was caused by two shortcuts in the optimizer that
are inapplicable in the ROLLUP case.

Normally in a case when only const tables are involved in a
query, DISTINCT clause can be safely optimized away since there
may be only one row produced by the join. Similarly, we don't
need to create a temporary table to resolve DISTINCT/GROUP
BY/ORDER BY. Both of these are inapplicable when the WITH
ROLLUP modifier is present.

Fixed by disabling the said optimizations for the WITH ROLLUP
case.

Just change mysql_foo to mysql_cv_foo for one cache-id variable name.  There
was only one bad variable name, present in 5.0 and 5.1, but not in the -pe
branch.

The SE API requires mysql to notify the storage engine that
it's going to read certain tables at the beginning of the 
statement (by calling start_stmt(), store_lock() or
external_lock()).
These are typically called by the lock_tables(). 
However SHOW CREATE TABLE is not pre-locking the tables
because it's not expected to access the data at all.
But for some view definitions (that include comparing a
date/datetime/timestamp column to a string returning
scalar subquery) the JOIN::prepare may still access data
when materializing the scalar non-correlated subquery
in Arg_comparator::can_compare_as_dates().
Fixed by not materializing the subquery when the function
is called in a SHOW/EXPLAIN/CREATE VIEW

If --log-bin is set to a directory name with the trailing 'FN_LIBCHAR', 
which will be '/' on Unix like systems, and '\\' on Windows like systems. 
the basename of the binlog is empty so that the created files named 
'.000001' and '.index'. It is not expected. 
The same thing happened to --log-bin-index, --relay-log and 
--relay-log-index options.

To resolve the problem, in these cases the program should report an error 
and abort.

BUG#47983: rpl_extraColmaster_myisam failed in PB2 with "Found
warnings!!"

BUG 45214 fixed the case when get_master_version_and_clock
function, used by the slave, would not report errors. The slave
now detects them and if related to transient network failures, it
prints some warnings and retries to connect. On the other hand,
if not network related, it just gives up and fails.

As such, sometimes, in PB2, the slave comes across some transient
communication issues between master and slave, while calling
get_master_version_and_clock, causing warnings print outs to the
error log. Nevertheless, in such cases slave retries to connect,
in which it succeeds, and the test case continues as it normally
would. But then, at the end of a successful test run, MTR checks
the error log, finds the unexpected warnings and considers them
harmful. This causes MTR to report error and, consequently, PB2
to report a failing test.

We fix this by adding to the global warnings suppress list the
warnings related to transient network failures only, which are
reported while in function get_master_version_and_clock.

  special chars

This script failed when the user tried passwords with multiple spaces, \, # or
' characters.  Now proper escaping and quoting is used in all contexts.

This problem occurs in the Perl version of this script, too, so fix it in both
places.

Remove a bash-ism (if ! ...).

Bug#41756 "Strange error messages about locks from InnoDB".
      
In JT_EQ_REF (join_read_key()) access method, 
don't try to unlock rows in the handler, unless certain that 
a) they were locked
b) they are not used.

Unlocking of rows is done by the logic of the nested join loop,
and is unaware of the possible caching that the access method may
have. This could lead to double unlocking, when a row
was unlocked first after reading into the cache, and then 
when taken from cache, as well as to unlocking of rows which
were actually used (but taken from cache).
      
Delegate part of the unlocking logic to the access method,
and in JT_EQ_REF count how many times a record was actually 
used in the join. Unlock it only if it's usage count is 0.

Implemented review comments.

Bug#41756 "Strange error messages about locks from InnoDB".

In JT_EQ_REF (join_read_key()) access method,
don't try to unlock rows in the handler, unless certain that
a) they were locked
b) they are not used.

Unlocking of rows is done by the logic of the nested join loop,
and is unaware of the possible caching that the access method may
have. This could lead to double unlocking, when a row
was unlocked first after reading into the cache, and then
when taken from cache, as well as to unlocking of rows which
were actually used (but taken from cache).

Delegate part of the unlocking logic to the access method,
and in JT_EQ_REF count how many times a record was actually
used in the join. Unlock it only if it's usage count is 0.

Implemented review comments.

- re-enabled main.innodb_bug44369;
- re-enabled main.innodb_bug47777;
- re-enabled innodb.innodb_information_schema.

            values return too many records

WHERE clauses with "outer_value_list NOT IN subselect" were
handled incorrectly if the outer value list contained multiple 
items where at least one of these could be NULL. The first 
outer record with NULL value was handled correctly, but if a 
second record with NULL value existed, the optimizer would 
choose to reuse the result it got on the last execution of the 
subselect. This is incorrect if the outer value list has 
multiple items.
     
The fix is to make Item_in_optimizer::val_int (in 
item_cmpfunc.cc) reuse the result of the latest execution
for NULL values only if all values in the outer_value_list 
are NULL.

Detailed revision comments:

r6126 | vasil | 2009-10-30 10:36:07 +0200 (Fri, 30 Oct 2009) | 45 lines
branches/zip: Merge r6112:6125 from branches/5.1:

(skipping r6122 and r6123, Jimmy says these are already present and need
not be merged):

  ------------------------------------------------------------------------
  r6122 | jyang | 2009-10-30 05:18:38 +0200 (Fri, 30 Oct 2009) | 7 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     M /branches/5.1/mysql-test/innodb_bug44369.result
     M /branches/5.1/mysql-test/innodb_bug44369.test
     M /branches/5.1/mysql-test/innodb_bug46000.result
     M /branches/5.1/mysql-test/innodb_bug46000.test
  
  branches/5.1: Chnage WARN_LEVEL_ERROR to WARN_LEVEL_WARN
  for push_warning_printf() call in innodb.
  Fix Bug#47233: Innodb calls push_warning(MYSQL_ERROR::WARN_LEVEL_ERROR)
  
  rb://170 approved by Marko.
  
  
  ------------------------------------------------------------------------
  r6123 | jyang | 2009-10-30 05:43:06 +0200 (Fri, 30 Oct 2009) | 8 lines
  Changed paths:
     M /branches/5.1/os/os0proc.c
  
  branches/5.1: In os_mem_alloc_large(), if we fail to attach
  the shared memory, reset memory pointer ptr to NULL, and
  allocate memory from conventional pool. This is a port
  from branches/zip.
  Bug #48237 Error handling in os_mem_alloc_large appears to be incorrect
  rb://198  Approved by: Marko
  
  
  ------------------------------------------------------------------------
  r6125 | vasil | 2009-10-30 10:31:23 +0200 (Fri, 30 Oct 2009) | 4 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
  
  branches/5.1:
  
  White-space fixup.
  
  ------------------------------------------------------------------------

Detailed revision comments:

r6121 | sunny | 2009-10-30 01:42:11 +0200 (Fri, 30 Oct 2009) | 7 lines
branches/zip: This test has been problematic for sometime now. The underlying
bug is that the data dictionaries get out of sync. In the AUTOINC code we
try and apply salve to the symptoms. In the past MySQL made some unrelated
change and the dictionaries stopped getting out of sync and this test started
to fail. Now, it seems they have reverted that changed and the test is
passing again. I suspect this is not he last time that this test will change.

r6124 | jyang | 2009-10-30 10:02:31 +0200 (Fri, 30 Oct 2009) | 5 lines
branches/zip: Correct the bug number for -r6109 change
from # 48273 to #48237

Detailed revision comments:

r6114 | vasil | 2009-10-29 18:43:51 +0200 (Thu, 29 Oct 2009) | 6 lines
branches/zip:

* Add ChangeLog entries for latest changes
* Obey alphabetical order in the list of the files
* White-space fixup

Detailed revision comments:

r6113 | vasil | 2009-10-29 18:15:50 +0200 (Thu, 29 Oct 2009) | 93 lines
branches/zip: Merge r5912:6112 from branches/5.1:

(after this merge the innodb-autoinc test starts to fail, but
I commit anyway because it would be easier to investigate the
failure this way)

  ------------------------------------------------------------------------
  r5952 | calvin | 2009-09-22 19:45:07 +0300 (Tue, 22 Sep 2009) | 7 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
  
  branches/5.1: fix bug#42383: Can't create table 'test.bug39438'
  
  For embedded server, MySQL may pass in full path, which is
  currently disallowed. It is needed to relax the condition by
  accepting full paths in the embedded case.
  
  Approved by: Heikki (on IM)
  ------------------------------------------------------------------------
  r6032 | vasil | 2009-10-01 15:55:49 +0300 (Thu, 01 Oct 2009) | 8 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
  
  branches/5.1:
  
  Fix Bug#38996 Race condition in ANALYZE TABLE
  
  by serializing ANALYZE TABLE inside InnoDB.
  
  Approved by:	Heikki (rb://175)
  
  ------------------------------------------------------------------------
  r6045 | jyang | 2009-10-08 02:27:08 +0300 (Thu, 08 Oct 2009) | 7 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     A /branches/5.1/mysql-test/innodb_bug47777.result
     A /branches/5.1/mysql-test/innodb_bug47777.test
  
  branches/5.1: Fix bug #47777. Treat the Geometry data same as
  Binary BLOB in ha_innobase::store_key_val_for_row(), since the
  Geometry data is stored as Binary BLOB in Innodb.
  
  Review: rb://180 approved by Marko Makela.
  
  
  ------------------------------------------------------------------------
  r6051 | sunny | 2009-10-12 07:05:00 +0300 (Mon, 12 Oct 2009) | 6 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     M /branches/5.1/mysql-test/innodb-autoinc.result
     M /branches/5.1/mysql-test/innodb-autoinc.test
  
  branches/5.1: Ignore negative values supplied by the user when calculating the
  next value to store in dict_table_t. Setting autoincrement columns top negative
  values is undefined behavior and this change should bring the behavior of
  InnoDB closer to what users expect. Added several tests to check.
  rb://162
  
  ------------------------------------------------------------------------
  r6052 | sunny | 2009-10-12 07:09:56 +0300 (Mon, 12 Oct 2009) | 4 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     M /branches/5.1/mysql-test/innodb-autoinc.result
     M /branches/5.1/mysql-test/innodb-autoinc.test
  
  branches/5.1: Reset the statement level autoinc counter on ROLLBACK. Fix
  the test results too.
  rb://164
  
  ------------------------------------------------------------------------
  r6053 | sunny | 2009-10-12 07:37:49 +0300 (Mon, 12 Oct 2009) | 6 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     M /branches/5.1/mysql-test/innodb-autoinc.result
     M /branches/5.1/mysql-test/innodb-autoinc.test
  
  branches/5.1: Copy the maximum AUTOINC value from the old table to the new
  table when MySQL does a CREATE INDEX ON T. This is required because MySQL
  does a table copy, rename and drops the old table.
  Fix Bug#47125: auto_increment start value is ignored if an index is created and engine=innodb
  rb://168
  
  ------------------------------------------------------------------------
  r6076 | vasil | 2009-10-14 19:30:12 +0300 (Wed, 14 Oct 2009) | 4 lines
  Changed paths:
     M /branches/5.1/row/row0mysql.c
  
  branches/5.1:
  
  Fix typo.
  
  ------------------------------------------------------------------------

Detailed revision comments:

r6112 | calvin | 2009-10-29 16:21:15 +0200 (Thu, 29 Oct 2009) | 4 lines
branches/zip: consideration for icc compilers

Proposed by MySQL, and approved by Marko.

Detailed revision comments:

r6110 | marko | 2009-10-29 12:44:57 +0200 (Thu, 29 Oct 2009) | 2 lines
branches/zip: Makefile.am (INCLUDES): Merge a change from MySQL:
Use $(srcdir)/include instead of $(top_srcdir)/storage/innobase/include.
r6111 | marko | 2009-10-29 13:04:11 +0200 (Thu, 29 Oct 2009) | 33 lines
branches/zip: Fix corruption of buf_pool->LRU_old and improve debug assertions.
This was reported as Issue #381.

buf_page_set_old(): Assert that blocks may only be set old if
buf_pool->LRU_old is initialized and buf_pool->LRU_old_len is nonzero.
Assert that buf_pool->LRU_old points to the block at the old/new boundary.

buf_LRU_old_adjust_len(): Invoke buf_page_set_old() after adjusting
buf_pool->LRU_old and buf_pool->LRU_old_len, in order not to violate
the added assertions.

buf_LRU_old_init(): Replace buf_page_set_old() with a direct
assignment to bpage->old, because these loops that initialize all the
blocks would temporarily violate the assertions about
buf_pool->LRU_old.

buf_LRU_remove_block(): When setting buf_pool->LRU_old = NULL, also
clear all bpage->old flags and set buf_pool->LRU_old_len = 0.

buf_LRU_add_block_to_end_low(), buf_LRU_add_block_low(): Move the
buf_page_set_old() call later in order not to violate the debug
assertions.  If buf_pool->LRU_old is NULL, set old=FALSE.

buf_LRU_free_block(): Replace the UNIV_LRU_DEBUG assertion with a
dummy buf_page_set_old() call that performs more thorough checks.

buf_LRU_validate(): Do not tolerate garbage in buf_pool->LRU_old_len
even if buf_pool->LRU_old is NULL.  Check that bpage->old is monotonic.

buf_relocate(): Make the UNIV_LRU_DEBUG checks stricter.

buf0buf.h: Revise the documentation of buf_page_t::old and
buf_pool_t::LRU_old_len.

Detailed revision comments:

r6109 | jyang | 2009-10-29 10:37:32 +0200 (Thu, 29 Oct 2009) | 7 lines
branches/zip: In os_mem_alloc_large(), if we fail to attach
the shared memory, reset memory pointer ptr to NULL, and
 allocate memory from conventional pool.
Bug #48237 Error handling in os_mem_alloc_large appears to be incorrect
rb://198  Approved by: Marko

Detailed revision comments:

r6108 | calvin | 2009-10-29 07:58:04 +0200 (Thu, 29 Oct 2009) | 5 lines
branches/zip: close file handle when building with UNIV_HOTBACKUP

The change does not affect regular InnoDB engine. Confirmed by
Marko.