to cleanup open connections

It was possible to UNINSTALL storage engine plugin when binding
between THD object and storage engine is still active (e.g. in
the middle of transaction).

To avoid unclean deactivation (uninstall) of storage engine plugin
in the middle of transaction, additional storage engine plugin
lock is acquired by thd_set_ha_data().

If ha_data is not null and storage engine plugin was not locked
by thd_set_ha_data() in this connection before, storage engine
plugin gets locked.

If ha_data is null and storage engine plugin was locked by
thd_set_ha_data() in this connection before, storage engine
plugin lock gets released.

If handlerton::close_connection() didn't reset ha_data, server does
it immediately after calling handlerton::close_connection().

Note that this is just a framework fix, storage engines must switch
to thd_set_ha_data() from thd_ha_data() if they want to see fit.

include/mysql/plugin.h:
  As thd_{get|set}_ha_data() have some extra logic now, they
  must be implemented on server side.
include/mysql/plugin.h.pp:
  As thd_{get|set}_ha_data() have some extra logic now, they
  must be implemented on server side.
sql/handler.cc:
  Make sure ha_data is reset and ha_data lock is released.
sql/handler.h:
  hton is not supposed to be updated by ha_lock_engine(),
  make it const.
sql/sql_class.cc:
  As thd_{get|set}_ha_data() have some extra logic now, they
  must be implemented on server side.
sql/sql_class.h:
  Added ha_data lock.

Added a filter to mysqlhotcopy to filter out the same tables in the 'mysql' 
database that mysqldump filters out.

Add ignore pattern for valgrind messages.

Several problems addressed:

1. The maximum value for --open_files_limit on non-windows boxes
is now raised to UINT_MAX (the maximum possible without significant
changes in the code). The maximum value on windows is kept to be
2048 due to a known limitation (bug 24509).

2. mysqld_safe now supports --open_files_limit=xx in addition to 
--open-files-limit=xx

3. mysqld_safe always passes through --open[_-]files[_-]limit
to the underlying mysqld. It used to pass it through only if it 
the user running the script has access to the root directory or
there was an --user argument specified.

4. Fixed a prototype in my_file.c to match its counterpart in 
the other #ifdef branch.

mistake in previous push

We should disable const subselect item evaluation because
subselect transformation does not happen in view_prepare_mode
and thus val_...() methods can not be called.


mysql-test/r/ctype_ucs.result:
  test case
mysql-test/r/view.result:
  test case
mysql-test/t/ctype_ucs.test:
  test case
mysql-test/t/view.test:
  test case
sql/item.cc:
  disabled const subselect item evaluation in
  view prepare mode.
sql/item_subselect.cc:
  added Item_subselect::safe_charset_converter which
  prevents const item evaluation in view prepare mode.
sql/item_subselect.h:
  added Item_subselect::safe_charset_converter which
  prevents const item evaluation in view prepare mode.

The problem is that we can not use make_cond_for_table().
This function relies on used_tables() condition
which is not set properly for subqueries.
As result subquery is not filtered out.
The fix is to use remove_eq_conds() function instead
of make_cond_for_table() func. 'remove_eq_conds()'
algorithm relies on const_item() value and it allows
to handle subqueries in right way.


mysql-test/r/having.result:
  test case
mysql-test/t/having.test:
  test case
sql/sql_select.cc:
  The fix is to use remove_eq_conds() function instead
  of make_cond_for_table() function.

            Procedure, while DECIMAL works

Selecting of the CONCAT(...<SP variable>...) result into
a user variable may return wrong data.


Item_func_concat::val_str contains a number of memory
allocation-saving tricks. One of them concatenates
strings inplace inserting the value of one string
at the beginning of the other string. However,
this trick didn't care about strings those points
to the same data buffer: this is possible when
a CONCAT() parameter is a stored procedure variable -
Item_sp_variable::val_str() uses the intermediate
Item_sp_variable::str_value field, where it may
store a reference to an external buffer.


The Item_func_concat::val_str function has been
modified to take into account val_str functions
(such as Item_sp_variable::val_str) that return
a pointer to an internal Item member variable
that may reference to a buffer provided.


mysql-test/r/func_concat.result:
  Test case for the bug #40625.
mysql-test/t/func_concat.test:
  Test case for the bug #40625.
sql/item_strfunc.cc:
  Bug #40625: Concat fails on DOUBLE values in a Stored
              Procedure, while DECIMAL works
  
  The Item_func_concat::val_str function has been
  modified to take into account val_str functions
  (such as Item_sp_variable::val_str) that return
  a pointer to an internal Item member variable
  that may reference to a buffer provided.

       on index

'my_decimal' class has two members which can be used to access the 
value. The member variable buf (inherited from parent class decimal_t) 
is set to member variable buffer so that both are pointing to same value.

Item_copy_decimal::copy() uses memcpy to clone 'my_decimal'. The member
buffer is declared as an array and memcpy results in copying the values
of the array, but the inherited member buf, which should be pointing at
the begining of the array 'buffer' starts pointing to the begining of 
buffer in original object (which is being cloned). Further updates on 
'my_decimal' updates only the inherited member 'buf' but leaves 
buffer unchanged.

Later when the new object (which now holds a inconsistent value) is cloned
again using proper cloning function 'my_decimal2decimal' the buf pointer
is fixed resulting in loss of the current value.

Using my_decimal2decimal instead of memcpy in Item_copy_decimal::copy()
fixed this problem.


mysql-test/r/subselect.result:
  Updated result file after addding test case for bug#47904.
mysql-test/t/subselect.test:
  Added test case for bug#47904.
sql/item.cc:
  Memcopy shouldn't be used to clone my_decimal. Use my_decimal2decimal
  instead.

            data and index files

It was possible if DATA/INDEX DIRECTORY is pointing to
symlinked MySQL data home directory.

Do not allow to drop data/index files implicitly symlinked
to data home directory. For such tables remove symlink only.

mysql-test/r/symlink.result:
  A test case for BUG#40980.
mysql-test/t/symlink.test:
  A test case for BUG#40980.
storage/myisam/mi_delete_table.c:
  Do not allow to drop data/index files implicitly symlinked
  to data home directory. For such tables remove symlink only.

Detailed revision comments:

r6900 | mmakela | 2010-03-29 13:54:57 +0300 (Mon, 29 Mar 2010) | 5 lines
branches/zip: Merge c6899 from branches/innodb+:

Add debug assertions to track down Bug #52360.
hash_table_t::magic_n: Add HASH_TABLE_MAGIC_N checks, which were fully absent.
ut_hash_ulint(): Assert table_size > 0 before division.

Detailed revision comments:

r6897 | mmakela | 2010-03-29 11:36:19 +0300 (Mon, 29 Mar 2010) | 3 lines
branches/zip: innodb_mutex_show_status(): Fix a condition
that was accidentally negated in r6781, making SHOW ENGINE INNODB MUTEX STATUS
display only locks with no OS waits.

Detailed revision comments:

r6891 | vdimov | 2010-03-26 16:19:01 +0200 (Fri, 26 Mar 2010) | 5 lines
Non-functional change: update copyright year to 2010 of the files
that have been modified after 2010-01-01 according to svn.

for f in $(svn log -v -r{2010-01-01}:HEAD |grep "^   M " |cut -b 16- |sort -u) ; do sed -i "" -E 's/(Copyright \(c\) [0-9]{4},) [0-9]{4}, (.*Innobase Oy.+All Rights Reserved)/\1 2010, \2/' $f ; done

Detailed revision comments:

r6875 | vdimov | 2010-03-25 18:18:15 +0200 (Thu, 25 Mar 2010) | 4 lines
branches/zip:

Wrap line at 78 column in ChangeLog.

Detailed revision comments:

r6874 | vdimov | 2010-03-25 17:17:52 +0200 (Thu, 25 Mar 2010) | 4 lines
branches/zip:

Wrap ChangeLog at 78th column

Detailed revision comments:

r6873 | vdimov | 2010-03-25 17:06:56 +0200 (Thu, 25 Mar 2010) | 4 lines
branches/zip:

Use Bug#N instead of Bug #N to be consistent with the rest of the fil.

Detailed revision comments:

r6872 | vdimov | 2010-03-25 17:03:17 +0200 (Thu, 25 Mar 2010) | 4 lines
branches/zip:

Fix ChangeLog - write only the bug title in bugs.mysql.com-related entires.

Detailed revision comments:

r6871 | vdimov | 2010-03-25 16:39:44 +0200 (Thu, 25 Mar 2010) | 4 lines
branches/zip:

Whitespace fixup to be consistent with the rest of the file.

Detailed revision comments:

r6868 | mmakela | 2010-03-25 13:03:08 +0200 (Thu, 25 Mar 2010) | 1 line
branches/zip: page_validate(): Check the buf[] bounds.

Detailed revision comments:

r6864 | mmakela | 2010-03-24 14:05:53 +0200 (Wed, 24 Mar 2010) | 1 line
branches/zip: dtype_new_store_for_order_and_null_size(): Add ut_ad() on mtype.

Detailed revision comments:

r6861 | vdimov | 2010-03-23 19:31:02 +0200 (Tue, 23 Mar 2010) | 36 lines
branches/zip:

Merge joerg@mysql.com-20100322150231-vdq0afbqtmbs6phy from BZR,

Including univ.i before mysql/plugin.h is needed to avoid this
compiler error:

o  This is how gcc puts it:
o  > > ccache /usr/local/gcc-4.3.2/bin/gcc -static-libgcc -DHAVE_CONFIG_H -I. -I../../include -I../../include -I../../include -I../../regex -I./include -I../../sql -I. -I../../zlib    -g -O3 -march=i686   -DUNIV_LINUX -MT libinnobase_a-trx0i_s.o -MD -MP -MF .deps/libinnobase_a-trx0i_s.Tpo -c -o libinnobase_a-trx0i_s.o `test -f 'trx/trx0i_s.c' || echo './'`trx/trx0i_s.c
o  > > In file included from ./include/univ.i:114,
o  > >                  from trx/trx0i_s.c:36:
o  > > ../../include/my_pthread.h:628: error: expected ')' before '*' token
o  > > In file included from ../../include/my_pthread.h:732,
o  > >                  from ./include/univ.i:114,
o  > >                  from trx/trx0i_s.c:36:
o  > > ../../include/mysql/psi/mysql_thread.h:100: error: expected specifier-qualifier-list before 'pthread_rwlock_t'
o  > > ../../include/mysql/psi/mysql_thread.h:116: error: expected specifier-qualifier-list before 'pthread_rwlock_t'
o  > > ../../include/mysql/psi/mysql_thread.h: In function 'inline_mysql_rwlock_init':
o  > > ../../include/mysql/psi/mysql_thread.h:711: error: 'mysql_rwlock_t' has no member named 'm_psi'
o  > > ../../include/mysql/psi/mysql_thread.h:716: error: 'mysql_rwlock_t' has no member named 'm_rwlock'
o  > > .... ((continued))
o  
o  Intel's icc gives slightly clearer messages:
o  > > icc -static-intel -static-libgcc -DHAVE_CONFIG_H -I. -I../../include -I../../include -I../../include -I../../regex -I./include -I../../sql -I. -I../../zlib    -O3 -g -unroll2 -ip -mp -restrict -no-ftz -no-prefetch   -DUNIV_LINUX -MT libinnobase_a-trx0i_s.o -MD -MP -MF .deps/libinnobase_a-trx0i_s.Tpo -c -o libinnobase_a-trx0i_s.o `test -f 'trx/trx0i_s.c' || echo './'`trx/trx0i_s.c
o  > > ../../include/my_pthread.h(628): error: identifier "pthread_rwlock_t" is undefined
o  > >   extern int rw_pr_init(rw_pr_lock_t *);
o  > >                         ^
o  > > 
o  > > ../../include/mysql/psi/mysql_thread.h(100): error: identifier "pthread_rwlock_t" is undefined
o  > >     rw_lock_t m_rwlock;
o  > >     ^
o  > > 
o  > > ../../include/mysql/psi/mysql_thread.h(116): error: identifier "pthread_rwlock_t" is undefined
o  > >     rw_pr_lock_t m_prlock;
o  > >     ^

Detailed revision comments:

r6860 | jyang | 2010-03-23 18:20:36 +0200 (Tue, 23 Mar 2010) | 5 lines
branches/zip: This is patch from Inaam that uses red-black tree
to speed up insertions into the flush_list and thus the recovery
process. The patch has been tested by Nokia.

Detailed revision comments:

r6858 | mmakela | 2010-03-23 14:09:24 +0200 (Tue, 23 Mar 2010) | 1 line
branches/zip: innodb_read_ahead_threshold: Add missing space to help string.

Detailed revision comments:

r6857 | mmakela | 2010-03-23 14:07:53 +0200 (Tue, 23 Mar 2010) | 1 line
branches/zip: innodb_change_buffering: Correct the documentation.

Detailed revision comments:

r6853 | marko | 2010-03-22 13:35:29 +0200 (Mon, 22 Mar 2010) | 1 line
branches/zip: mutex_own(), rw_lock_own(): Add attribute((warn_unused_result)).

Detailed revision comments:

r6840 | calvin | 2010-03-19 00:32:23 +0200 (Fri, 19 Mar 2010) | 6 lines
branches/zip: Fix Bug #52102 InnoDB Plugin shows performance drop
comparing to builtin InnoDB (Windows only).

Disable Windows atomics by default.

Approved by: Inaam

Detailed revision comments:

r6830 | marko | 2010-03-18 09:48:18 +0200 (Thu, 18 Mar 2010) | 3 lines
branches/zip: buf_page_peek_if_too_old(): Use 32-bit arithmetics
when comparing the age of access_time to buf_LRU_old_threshold_ms.
This fixes a bug on 64-bit systems.

Detailed revision comments:

r6828 | calvin | 2010-03-17 17:16:38 +0200 (Wed, 17 Mar 2010) | 7 lines
branches/zip: rename IB_HAVE_PAUSE_INSTRUCTION to
HAVE_IB_PAUSE_INSTRUCTION in CMakeLists.txt.

The rename was done as r5871, but CMakeLists.txt was
forgotten. Also, add INNODB_RW_LOCKS_USE_ATOMICS to
CMake.