Bug#319  if while a non-transactional slave is replicating a transaction possible problem

only testing related: addressing reviewers' comments.

Bug#319  if while a non-transactional slave is replicating a transaction possible problem 

It is impossible to roll back a mixed engines transaction when one of the engine is
non-transaction. In replication that fact is crucial because the slave can not safely
re-apply a transction that was interrupted with STOP SLAVE.

Fixed with making STOP SLAVE not be effective immediately in the case the current
group of replication events has modified a non-transaction table. In order for slave to leave
either the group needs finishing or the user issues KILL QUERY|CONNECTION slave_thread_id.

                          
When using mixed mode the record values stored inside the storage
engine differed from the ones computed from the row event. This
happened because the prepare_record function was calling
empty_record macro causing some don't care bits to be left set.
                          
Replacing the empty_record plus explicitly setting defaults with 
restore_record to restore the record default values fixes this.                          

      
When binlog_format is STATEMENT and the statement is unsafe before,
the unsafe warning/error message was issued without checking
whether the SQL_LOG_BIN was turned on or not.
      
Fixed with adding a sql_log_bin_toplevel flag in THD to check
whether SQL_LOG_BIN is ON in current session whatever the current is in sp or not.

set user variable max length on
fix_length_and_dec() stage
using real value length.

remove 'unsigned', 'zerofill' attributes
from DATA_TYPE column value.

Backporting patch to 5.0.

of system errnos when opening a table are masked 
as ER_FILE_NOT_FOUND. This patch handles this as
"Operation failed" as well.

pushbuild".

Under new MTR the server is not restarted for every test, so
threads started in the previous test case can show up in the
results of SHOW PROCESSLIST statement in this test, causing a
test failure.

Since we are not really interested in results of SHOW PROCESSLIST
in this test but rather in fact that server doesn't crash when
executing this statement this fix simply disables output of this
statement.

Bug #42152: Race condition in lock_is_table_exclusive()

Detailed revision comments:

r4005 | marko | 2009-01-20 16:22:36 +0200 (Tue, 20 Jan 2009) | 8 lines
branches/5.1: lock_is_table_exclusive(): Acquire kernel_mutex before
accessing table->locks and release kernel_mutex before returning from
the function.  This fixes a portential race condition in the
"commit every 10,000 rows" in ALTER TABLE, CREATE INDEX, DROP INDEX,
and OPTIMIZE TABLE. (Bug #42152)

rb://80 approved by Heikki Tuuri

Bug #41571: MySQL segfaults after innodb recovery

Detailed revision comments:

r4004 | marko | 2009-01-20 16:19:00 +0200 (Tue, 20 Jan 2009) | 12 lines
branches/5.1: Merge r4003 from branches/5.0:

rec_set_nth_field(): When the field already is SQL null,
do nothing when it is being changed to SQL null. (Bug #41571)

Normally, MySQL does not pass "do-nothing" updates to the storage engine.
When it does and a column of an InnoDB table that is in ROW_FORMAT=COMPACT
is being updated from NULL to NULL, the InnoDB buffer pool will be corrupted
without this fix.

rb://81 approved by Heikki Tuuri

Bug #42075: dict_load_indexes failure in dict_load_table will corrupt the dictionary cache

Detailed revision comments:

r3930 | marko | 2009-01-14 15:51:30 +0200 (Wed, 14 Jan 2009) | 4 lines
branches/5.1: dict_load_table(): If dict_load_indexes() fails,
invoke dict_table_remove_from_cache() instead of dict_mem_table_free(),
so that the data dictionary will not point to freed data.
(Bug #42075, Issue #153, rb://76 approved by Heikki Tuuri)

Bug #38187: Error 153 when creating savepoints

Detailed revision comments:

r3911 | sunny | 2009-01-13 14:15:24 +0200 (Tue, 13 Jan 2009) | 13 lines
branches/5.1: Fix Bug#38187 Error 153 when creating savepoints
InnoDB previously treated savepoints as a stack e.g.,
  SAVEPOINT a;
  SAVEPOINT b;
  SAVEPOINT c;
  SAVEPOINT b; <- This would delete b and c.

This fix changes the behavior to:
  SAVEPOINT a;
  SAVEPOINT b;
  SAVEPOINT c;
  SAVEPOINT b; <- Does not delete savepoint c

Bug #41571: MySQL segfaults after innodb recovery

This 5.0 fix will not be pushed into 5.1; a separate fix (from
innodb-5.1-ss4007) will be pushed into 5.1+.

Detailed revision comments:

r4003 | marko | 2009-01-20 16:12:50 +0200 (Tue, 20 Jan 2009) | 10 lines
branches/5.0: rec_set_nth_field(): When the field already is SQL null,
do nothing when it is being changed to SQL null. (Bug #41571)

Normally, MySQL does not pass "do-nothing" updates to the storage engine.
When it does and a column of an InnoDB table that is in ROW_FORMAT=COMPACT
is being updated from NULL to NULL, the InnoDB buffer pool will be corrupted
without this fix.

rb://81 approved by Heikki Tuuri

Bug #18828: If InnoDB runs out of undo slots, it returns misleading 'table is full'

This is a backport of code already in 5.1+.  The error message change referred
to in the detailed revision comments is still pending.

Detailed revision comments:

r3937 | calvin | 2009-01-15 03:11:56 +0200 (Thu, 15 Jan 2009) | 17 lines
branches/5.0:

Backport the fix for Bug#18828. Return DB_TOO_MANY_CONCURRENT_TRXS
when we run out of UNDO slots in the rollback segment. The backport
is requested by MySQL under bug#41529 - Safe handling of InnoDB running
out of undo log slots.

This is a partial fix since the MySQL error code requested to properly
report the error condition back to the client has not yet materialized.
Currently we have #ifdef'd the error code translation in ha_innodb.cc.
This will have to be changed as and when MySQl add the new requested
code or an equivalent code that we can then use.

Given the above, currently we will get the old behavior, not the
"fixed" and intended behavior.

Approved by:	Heikki (on IM)

Bug #39939: DROP TABLE/DISCARD TABLESPACE takes long time in buf_LRU_invalidate_tablespace()

This was already fixed in 5.1+; this is a backport to 5.0.

Detailed revision comments:

r2743 | inaam | 2008-10-08 22:18:12 +0300 (Wed, 08 Oct 2008) | 13 lines
branches/5.0:

Backport of r2742 from branches/5.1:

Fix Bug#39939 DROP TABLE/DISCARD TABLESPACE takes long time in
buf_LRU_invalidate_tablespace()

Improve implementation of buf_LRU_invalidate_tablespace by attempting
hash index drop in batches instead of doing it one by one.

Reviewed by: Heikki, Sunny, Marko
Approved by: Heikki

      
Set wrong sql_mode when creating a procedure. 
So that the sql_mode can't be writen into binary log correctly.
      
Restore the current session sql_mode right before generating the binlog event
when creating a procedure.

return no rows

The algorithm of determining the best key for loose index scan is doing a loop
over the available indexes and selects the one that has the best cost.
It retrieves the parameters of the current index into a set of variables.
If the cost of using the current index is lower than the best cost so far it 
copies these variables into another set of variables that contain the 
information for the best index so far.
After having checked all the indexes it uses these variables (outside of the 
index loop) to create the table read plan object instance.
The was a single omission : the key_infix/key_infix_len variables were used 
outside of the loop without being preserved in the loop for the best index 
so far.
This causes these variables to get overwritten by the next index(es) checked.
Fixed by adding variables to hold the data for the current index, passing 
the new variables to the function that assigns values to them and copying 
the new variables into the existing ones when selecting a new current best 
index.
To avoid further such problems moved the declarations of the variables used 
to keep information about the current index inside the loop's compound 
statement.