UNION could convert fixed-point FLOAT(M,D)/DOUBLE(M,D) columns  
to FLOAT/DOUBLE when aggregating data types from the SELECT  
substatements. While there is nothing particularly wrong with  
this behavior, especially when M is greater than the hardware  
precision limits, it could be confusing in cases when all  
SELECT statements in a union have the same  
FLOAT(M,D)/DOUBLE(M,D) columns with equal precision  
specifications listed in the same position.  
  
Since the manual is quite vague on what data type should be  
returned in such cases, the bug was fixed by implementing the  
most 'expected' behavior: do not convert FLOAT(M,D)/DOUBLE(M,D)  
to anything else if all SELECT statements in a UNION have the  
same precision for that column.  

Replaced a call to load_defaults() in sql_plugin.cc with 
its thread-safe version.

select where .. (col=col and col=col) or ... (false expression)

Problem: optimizer didn't take into account a singular case 
when we eliminated all the predicates at the AND level of WHERE.
That may lead to wrong results.

Fix: replace (a=a AND a=a...) with TRUE if we eliminated all the
predicates.

      
There are some recursive targets that automake generates which reference
DIST_SUBDIRS.  It's critical, then, for such subdirs to exist even if they
won't be built as part of SUBDIRS.

During a VPATH build, it is the configure script which creates the subdirs
(when it processes the AC_CONFIG_FILES() for each subdir's Makefile).  If
autoconf doesn't create a subdir's Makefile, then the recursive make will fail
when it is unable to cd into that subdir.

This isn't a problem in non-VPATH builds, because the subdirs are all present
in the source tarball.  So the problem only shows up during 'make distcheck',
which does a VPATH build.

The fix is to look, when configure is being created by autoconf, for any
plugin subdirectories.  These are the dynamic subdirectories which need to be
handled specially.  It's enough to tell autoconf to generate a Makefile for
any Makefile.am found in the plugin directory - all plugin subdirectories
using automake (i.e., listed in the plugin's DIST_SUBDIRS) will have a
Makefile.am.

This is done by calling 'find'.  This means that 'find' must be in the PATH on
the host that is running autoconf.  'find' is NOT needed when calling
configure, so it is not an additional dependency for the user.

Finally, ha_ndbcluster.m4 had called AC_CONFIG_FILES() on all those subdir
Makefiles, but only when the plugin was actually being built.  So it didn't
work in the case that NDB was not being built.  All of those Makefiles have to
be removed from this static list, since the plugin machinery is now adding
them automatically.  autoconf fails if a file is duplicated in
AC_CONFIG_FILES().

--added ability to obtain plugin variables from my.cnf on INSTALL PLUGIN stage
--option 'ignore-builtin-innodb' disables all InnoDB builtin plugins
  (including I_S plugins)

test and (slightly different than 5.0) results.

Bug #43203  	Overflow from auto incrementing causes server segv

Detailed revision comments:

r4325 | sunny | 2009-03-02 02:28:52 +0200 (Mon, 02 Mar 2009) | 10 lines
branches/5.1: Bug#43203: Overflow from auto incrementing causes server segv
It was not a SIGSEGV but an assertion failure. The assertion was checking
the invariant that *first_value passed in by MySQL doesn't contain a value
that is greater than the max value for that type. The assertion has been
changed to a check and if the value is greater than the max we report a
generic AUTOINC failure.

rb://93
Approved by Heikki

Bug #42714  	AUTO_INCREMENT errors in 5.1.31

Detailed revision comments:

r4287 | sunny | 2009-02-25 05:32:01 +0200 (Wed, 25 Feb 2009) | 10 lines
branches/5.1: Fix Bug#42714 AUTO_INCREMENT errors in 5.1.31. There are two
changes to the autoinc handling.

1. To fix the immediate problem from the bug report, we must ensure that the
   value written to the table is always less than the max value stored in
   dict_table_t.

2. The second related change is that according to MySQL documentation when
   the offset is greater than the increment, we should ignore the offset.

Detailed revision comments:

r4165 | calvin | 2009-02-12 01:34:27 +0200 (Thu, 12 Feb 2009) | 1 line
branches/5.1: minor non-functional changes.

Bug #42400  	InnoDB autoinc code can't handle floating-point columns

Detailed revision comments:

r4065 | sunny | 2009-01-29 16:01:36 +0200 (Thu, 29 Jan 2009) | 8 lines
branches/5.1: In the last round of AUTOINC cleanup we assumed that AUTOINC
is only defined for integer columns. This caused an assertion failure when
we checked for the maximum value of a column type. We now calculate the
max value for floating-point autoinc columns too.

Fix Bug#42400 - InnoDB autoinc code can't handle floating-point columns
rb://84 and Mantis issue://162

r4111 | sunny | 2009-02-03 22:06:52 +0200 (Tue, 03 Feb 2009) | 2 lines
branches/5.1: Add the ULL suffix otherwise there is an overflow.

Bug #42279  	Race condition in btr_search_drop_page_hash_when_freed()

Detailed revision comments:

r4032 | marko | 2009-01-23 15:43:51 +0200 (Fri, 23 Jan 2009) | 10 lines
branches/5.1: Merge r4031 from branches/5.0:

btr_search_drop_page_hash_when_freed(): Check if buf_page_get_gen()
returns NULL.  The page may have been evicted from the buffer pool
between buf_page_peek_if_search_hashed() and buf_page_get_gen(),
because the buffer pool mutex will be released between these two calls.
(Bug #42279)

rb://82 approved by Heikki Tuuri

normalize error-messages

Since there is more than one duplicate value in the table, when adding the
unique index it is not deterministic which value will be reported as causing a
problem.  Replace the reported value with '' so that it doesn't affect the
results.

The problem is that creating a event could fail if the value of
the variable server_id didn't fit in the originator column of
the event system table. The cause is two-fold: it was possible
to set server_id to a value outside the documented range (from
0 to 2^32-1) and the originator column of the event table didn't
have enough room for values in this range.

The log tables (general_log and slow_log) also don't have a proper
column type to store the server_id and having a large server_id
value could prevent queries from being logged.

The solution is to ensure that all system tables that store the
server_id value have a proper column type (int unsigned) and that
the variable can't be set to a value that is not within the range.

      
The copy of the original arguments of a aggregate function was not
initialized until after fix_fields().
Sometimes (e.g. when there's an error processing the statement)
the print() can be called with no corresponding fix_fields() call.
      
Fixed by adding a check if the Item is fixed before using the arguments
copy.

The method to purge binary log files produces different results in some platforms.
The reason is that the purge time is calculated based on table modified time and
that can't guarantee to purge master-bin.000002 in all platforms.(eg. windows)

Use a new way that sets the time to purge binlog file 1 second after the last modified time of master-bin.000002.
That can be sure that the file is always deleted in any platform.