Problem: in 5.0 'check table for upgrade' doesn't detect
incompatible collation changes made in 5.0.48.

Fix: backport #39585 fix to 5.0

Altering how MTR checks global variable status to exclude timestamp
Changed SQL statements to update style.

Problem was usage of read_range_first with an empty key.

Solution was to not to give a key if it was empty.

ONLY_FULL_GROUP_BY

The check for non-aggregated columns in queries with aggregate function, but without
GROUP BY was treating all the parts of the query as if they are in the SELECT list.
Fixed by ignoring the non-aggregated fields in the WHERE clause.

Several system variables did not behave like system variables should do.
When trying to SET them or use them in SELECT, they were reported as
"unknown system variable". But they appeared in SHOW VARIABLES.

This has been fixed by removing the "fixed_vars" array of variables
and integrating the variables into the normal system variables chain.
All of these variables do now behave as read-only global-only
variables. Trying to SET them tells they are read-only, trying to
SELECT the session value tells they are global only. Selecting the
global value works. It delivers the same value as SHOW VARIABLES.

the problem is the same as reported in bug#20835,
so the fix is backport of bug#20835 patch.

returns truncated results

Problem: performig conversion from {INT, DECIMAL, REAL} to CHAR
we incorrectly set its max length in some cases that may lead
to truncated results returned.

Fix: properly set CONVERT({INT, DECIMAL, REAL}, CHAR) result's
max length.

temporarily if yassl maintainer has plans for other error handling.

variable settings (rpl_sys)

Problem: under certain conditions (e.g. user variables usage in triggers)
accessing a user defined variable we may use a variables hash table that
belongs to already deleted thread. It happens if
thd= new THD;
has the same address as just deleted thd as we use
if (stored_thd == thd)
to check.
That may lead to unpredictable results, server crash etc.

Fix: use thread_id instead of thd address to distinguish threads.

Note: no simple and repeatable test case.

Problem: memory leak occurs when we open a federated table
that has its share in the hash.

Fix: free not used memory.

Note: the fix should NOT be merged to 5.1 (the code changed).

set but is ignored".
                                  
This patch makes @@session.max_allowed_packed and
@@session.net_buffer_length read-only as suggested in the bug
report. The user will have to use SET GLOBAL (and reconnect)
to alter the session values of these variables.
                            
The error string ER_VARIABLE_IS_READONLY is introduced.
                            
Tests are modified accordingly.

Cache size  is truncated via 32bit ulong  in  ha_init_key_cache() and 
ha_resize_key_cache() 

This change fixes the cast to size_t instead of ulong. This cast is safe,
because key_buffer_size parameter is limited to SIZE_T_MAX

   additional fix - the 'debug' keyword removed

    That's a Win-specific error.
    When we create libmysqld.dll we have many libraries like mysys, dbug,
    strings, etc linked into that dll, so the application built upon
    this library shouldn't link these libraries to itself, rather use
    those inside the dll.

    Fixed by redirecting calls into the libmysqld.dll

per-file comments:
  dbug/dbug.c
Bug#38293 Libmysqld crash in mysql_library_init if language file missing
    fake _db_something definitions added

  include/my_dbug.h
Bug#38293 Libmysqld crash in mysql_library_init if language file missing
  fake _db_something declarations added

  libmysqld/examples/CMakeLists.txt
Bug#38293 Libmysqld crash in mysql_library_init if language file missing
    superfluous libraries removed from linking

  libmysqld/libmysqld.def
Bug#38293 Libmysqld crash in mysql_library_init if language file missing
    set of mysys functions added to the export section

		using crashes server

When the server is configured to use a RSA key, and when the client sends
a cipher-suite list that contains a non-RSA key as acceptable, the server 
would try to process that key even though it was impossible.

Now, yaSSL sets its own acceptable-cipher list according to what kind of
key the server is started with, and will never explore and try to pair 
impossible combinations.

This involves a partial import of the current YaSSL tree, not the whole
thing, so as to try to avoid introducing new bugs.

(Updated to avoid many whitespace changes and make diff smaller.)