This is a back port from 5.1 to 5.0.

Fix for BUG 20023: mysql_change_user() resets the value
of SQL_BIG_SELECTS.
  
The bug was that SQL_BIG_SELECTS was not properly set
in COM_CHANGE_USER.
  
The fix is to update SQL_BIG_SELECTS properly.



sql/sql_class.cc:
  Update THD::options with the respect to SQL_BIG_SELECTS
  in COM_CHANGE_USER.
tests/mysql_client_test.c:
  Add a test case BUG#20023.

Backporting patch to 5.0.

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

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.

mysql-test/r/group_min_max.result:
  Bug #41610: test case
mysql-test/t/group_min_max.test:
  Bug #41610: test case
sql/opt_range.cc:
  Bug #41610: copy the infix data for the current best index

of a view are selected by * wildcard

Backported a part of the fix for 36086 to 5.0

mysql-test/r/view_grant.result:
  Bug #41354: test case
mysql-test/t/view_grant.test:
  Bug #41354: test case
sql/sql_acl.cc:
  Bug #41354: return table error when no access and *
sql/sql_base.cc:
  Bug #41354: backported the check in bug 36086 to 5.0

Fixed a typo in the bug fix patch.

Started fix in 5.0 as the same issue is here.
Revising queries used given what appears to be the scope of this test to only select the manipulated variables.
Added tests for values that are / are not multiples of 1024 to test rounding / constraints.
This behavior is not currently documented (docs bug has been opened)

*with --with-charset=utf8*

Problem: wrong LONG TEXT field length is sent to a client 
when multibyte server character set used.

Fix: always limit field length sent to a client to 2^32,
as we store it in 4 byte slot.

Note: mysql_client_test changed accordingly.


sql/protocol.cc:
  Fix for bug#19829:make test Failed in mysql_client_test 
  *with --with-charset=utf8*
    - limit field length sent to client to UINT_MAX32 as 
      it may exceeds 32 bit slot for LONG TEXT fields if
      thd_charset->mbmaxlen > 1.
tests/mysql_client_test.c:
  Fix for bug#19829:make test Failed in mysql_client_test
  *with --with-charset=utf8*
    - checking field members have in mind that field length
      is limited to UINT_MAX32.

usermode address space limit.

Fix: use /LARGEADDRESSAWARE link option when linking 32 bit
executables

print compact view name if the view belongs to the current database


mysql-test/r/information_schema_db.result:
  result fix
mysql-test/r/mysqldump.result:
  result fix
mysql-test/r/view_grant.result:
  result fix
sql/sql_show.cc:
  print compact view name if the view belongs to the current database

Changed context of Create routine to Databases.


mysql-test/r/grant.result:
  result fix
mysql-test/r/sp.result:
  result fix
sql/sql_show.cc:
  Changed context of Create routine to Databases.

for bug #15936.

On some platforms fenv.h may #undef the min/max macros
defined in my_global.h.

Fixed by moving the #include directive for fenv.h from
mysqld.cc to my_global.h before definitions for min/max.

include/my_global.h:
  Moved #include <fenv.h> from mysqld.cc.
sql/mysqld.cc:
  Moved #include <fenv.h> to my_global.h.

      
There was a problem when a DELIMITER COMMAND is not the first 
command on the line. I this case an extra line feed was added
to the glob buffer and this was causing subsequent attempts 
to enter this delimiter to fail.
Fixed by not adding a new line to the glob buffer if the 
command being added is a DELIMITER

client/mysql.cc:
  Bug #31060: Don't add a new line if DELIMTER is added to
  the glob buffer
mysql-test/r/mysql.result:
  Bug #31060: test case
mysql-test/t/mysql.test:
  Bug #31060: test case

Add all HA error numbers and descriptions to perror.

Add reminder to header.

This is already fixed in smarter ways in future codebases, and this 
codebase is unlikely to change, since new development is forbidden
here.

Bug#41112: crash in mysql_ha_close_table/get_lock_data with alter table

The problem is that the server wasn't handling robustly failures
to re-open a table during a HANDLER .. READ statement. If the
table needed to be re-opened due to it's storage engine being
altered to one that doesn't support HANDLER, a reference (dangling
pointer) to a closed table could be left in place and accessed in
later attempts to fetch from the table using the handler. Also,
if the server failed to set a error message if the re-open
failed. These problems could lead to server crashes or hangs.

The solution is to remove any references to a closed table and
to set a error if reopening a table during a HANDLER .. READ
statement fails.

There is no test case in this change set as the test depends on
a testing feature only available on 5.1 and later.

sql/sql_handler.cc:
  Remove redundant reopen check.
  Set errors even if reopening table.
  Reset TABLE_LIST::table reference when the table is closed.

Both of our own implementations of rint(3) were inconsistent with the
most common behavior of rint() on those platforms that have it: round
to nearest, break ties by rounding to nearest even.

Fixed by leaving just one implementation of rint() in our source tree,
and changing its behavior to match the most common native
implementations on other platforms.

configure.in:
  Added checks for fenv.h and fesetround().
include/config-win.h:
  Removed the incorrect implementation of rint() for Windows.
include/my_global.h:
  Added an rint() implementation for platforms that do not have it.
mysql-test/r/func_math.result:
  Added a test case for bug #15936.
mysql-test/t/func_math.test:
  Added a test case for bug #15936.
sql/mysqld.cc:
  Explicitly set the FPU rounding mode with fesetround().