Add a new autoconf paremeter --{en,dis}able-community-features .  The
default is disable for enterprise servers.

Though this is a 5.0 tree, it is only to be merged into the 5.0-community
tree and the global 5.1 tree, never to the 5.0-enterprise tree.


configure.in:
  Add a new configure parameter, --enable-community-features for community 
  features.
mysql-test/t/profiling.test:
  Add testing for whether profiling is enabled or not.
sql/mysqld.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/set_var.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_class.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_class.h:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_parse.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_prepare.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_profile.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_profile.h:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_show.cc:
  Add "COMMUNITY_SERVER" cpp definition test.
mysql-test/include/profiling.inc:
  Add testing for whether profiling is enabled or not.
mysql-test/r/profiling.require:
  Add testing for whether profiling is enabled or not.

Additional changes to test:  "flush tables" so that Windows releases
the files.


mysql-test/r/mysqlcheck.result:
  Add "flush tables" to get windows to release the files, so that 
  we can test truncation properly.
mysql-test/t/mysqlcheck.test:
  Add "flush tables" to get windows to release the files, so that 
  we can test truncation properly.

halfway through a query (as happens in "SET SESSION PROFILING = ...")
has a few side-effects, the worst of which is a memory leak for
prepared statements, which poke directly from the parser into the 
profiling code (we don't have the query text when we need it) and 
that overwrites a pointer to heap-allocated memory when the previous
statement turns on profiling.

Instead, now set a flag when we begin a new statement that tracks 
whether profiling is on _at the start_ of the query.  Use that to
track whether we gather info.

Additionally, use that AND use the state of the profiling variable
after the end of a query to know whether to store information about 
the query that just finished.


mysql-test/r/profiling.result:
  Testing whether profiling is on at the beginning of a query and at
  the end of a query makes "SET SESSION PROFILING = ..." statements
  disappear from the profiling.  They were never reliable before.
sql/sql_profile.cc:
  Check to see if profiling was enabled at the beginning of this query
  before trying to store query_source.  This avoids a memory leak for
  prepared statements, which get here by direct means.
  
  If profiling was toggled in this query, then don't store this query
  profile.
sql/sql_profile.h:
  Keep track of whether profiling is on.

B-g#27427: resolveip fails on hostnames with a leading digit

We need inet_aton for the extra/resolveip tool.  Some OSes put this
in nonstandard libraries.


configure.in:
  We need inet_aton for the extra/resolveip tool.

is a special case in "SHOW PROFILE FOR QUERY n".  No one can get
the zero item (which is always the statement that turns on profiling),
because zero represents the final item, internally.

Now, order the queries starting at one.


mysql-test/r/profiling.result:
  Renumber the query IDs.
sql/sql_profile.cc:
  Start the profile_id_counter at 1, to overstep the special-case 
  value of zero.
  
  Unrelated, but looks similar: don't use -1 to initialize an unsigned 
  integer field.  That causes warnings in some environments.

B-g#27501: 5.0 significantly more sys ("kernel") time than 4.1 \
      due to getrusage() calls

Even if profiling is turned off, the parser makes calls to reset 
the state at the beginning of each query.  That would eventually 
instantiate a PROFILE_ENTRY, which does indeed capture resource 
usage.

Instead, now check that profiling is active before progressing
far into the storage/expiration of old entries in the history.
This has the pleasant side-effect that queries to toggle profiling
are not recorded in the history.


mysql-test/r/profiling.result:
  Now after we turn off profiling, the beginning of the next query 
  refuses to enter the profiling code and it discards the info.
sql/sql_profile.cc:
  Add the same condition twice:  Once to abort storing previous 
  query information and the other to abort initialization for this 
  query that is starting.
  
  We do this symmetrically, before and after expiring old history 
  entries, so that the counts are correct.

B-g#26600: table PROFILING in INFORMATION SCHEMA has wrong data type

B-g#27047[partial]: INFORMATION_SCHEMA table cannot have BIGINT \
      fields

No Information_schema table has ever needed floating-point data 
before.  Transforming all floating point to a string and back to a
number causes a real data problem on Windows, where the libc may 
pad the exponent with more leading zeroes than we expect and the
significant digits are truncated away.

This also makes interpreting an unimplemented type as a string into
a fatal error in debug builds.  Thus, we will catch problems when we
try to use those types in new I_S tables.


sql/sql_show.cc:
  Add floating-point types to Information_schema output.

B-g#27060: SQL Profile utility may not be reporting right duration \
      for each step

Whenever the profiler is reset at the beginning of a query, there's
a "hidden" profiling entry that represents that point in time.  It 
has no status description, as those are set by state changes and no
such point has yet been encountered.  That profiling entry is not
in the list of entries generated when we change states.

The profiling code had the problem that each step of printing 
profiling data subtracted the previous "step"'s data, but gave the
label to that data of the current step, which is wrong.  The label/
state refers to the period beginning with that profiling data, not
ending with it.

Now, give a label to the first profiling pseudo-entry, so that we 
have a name to assign to the period that ends with the first state 
change.  Now also use the state name of the previous step in showing 
the delta values that end with this step.


sql/sql_profile.cc:
  Store a status of "initializing" whenever we construct the first
  profile entry -- the one that gets reset whenever we're starting 
  a new query, before the server sets a real status.
  
  Additionally, associate the previous status with the time period
  that ends with the current profile entry's stats.
  
  Since we need yet another piece of info from the previous profiling
  entry, take out the piecemeal ways we currently do it and make a
  general pointer to the whole thing.

Patch contributed by Jocelyn Fournier.  CLA received 2007-02-27.
  
B-g#25347: mysqlcheck -A -r doesn't repair table marked as crashed
  
mysqlcheck tests nullness of the engine type to know whether the
"table" is a view or not.  That also falsely catches tables that 
are severly damaged.
  
Instead, use SHOW FULL TABLES to test whether a "table" is a view
or not.
  
(Don't add new function.  Instead, get original data a smarter way.)

Make it safe for use against databases before when views appeared.


client/mysqlcheck.c:
  Use SHOW FULL TABLES to test better whether a name in the table
  list is one of a view.  Checking that the engine is NULL is 
  insufficient.
  
  Implemented suggestion from jimw that involved removing most of 
  original patch and getting data a better way
mysql-test/r/mysqlcheck.result:
  Verify that tables that have NULL/unreadable engine types are 
  processed and not interpreted as views.
mysql-test/t/mysqlcheck.test:
  Verify that tables that have NULL/unreadable engine types are 
  processed and not interpreted as views.

B-g#24795: SHOW PROFILE implementation

Don't use memory roots to store profiling information, because
memory roots make freeing the data a no-op, and thus long-running
processes with profiling turned on the whole time could eventually 
use all available memory.

Instead, use regular heap allocation and deallocation calls to 
manage profiling data.  Replace the leaky List usage with a similar-
behaving structure named "Queue".


sql/sql_profile.cc:
  Don't use C++ iterators on our simple Queue implementation.  They're
  not implemented and we don't really need them.
  
  Rip out idea of swapping out the thd's mem_root.
sql/sql_profile.h:
  Rip out idea of needing a mem_root.
  
  Implement a Queue that looks and behaves very similarly to memroot-
  using List.

Fixed bug #27362: crash at evaluation of IN predicate when one
of its argument happened to be a decimal expression returning
the NULL value.
The crash was due to the fact the function in_decimal::set did
not take into account that val_decimal() could return 0 if 
the decimal expression had been evaluated to NULL.  


mysql-test/r/func_in.result:
  Added a test case for bug #27362.
mysql-test/t/func_in.test:
  Added a test case for bug #27362.
sql/item_cmpfunc.cc:
  Fixed bug #27362: crash at evaluation of IN predicate when one
  of its argument happened to be a decimal expression returning
  the NULL value.
  The crash was due to the fact the function in_decimal::set did
  not take into account that val_decimal() could return 0 if 
  the decimal expression had been evaluated to NULL.

The test fails, and it shouldn't.


mysql-test/r/information_schema.result:
  The query to generate this list is pretty bogus in any case.  Listing 
  all columns of a particular type tells us nothing at all.

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-community


VC++Files/sql/mysqld.vcproj:
  Auto merged
include/config-win.h:
  Auto merged
myisam/mi_open.c:
  Auto merged
mysql-test/r/information_schema_db.result:
  Auto merged
ndb/src/common/util/File.cpp:
  Auto merged
sql/Makefile.am:
  Auto merged
sql/ha_archive.cc:
  Auto merged
sql/ha_berkeley.cc:
  Auto merged
sql/ha_myisam.cc:
  Auto merged
sql/ha_myisammrg.cc:
  Auto merged
sql/ha_ndbcluster.cc:
  Auto merged
sql/item_cmpfunc.cc:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/lock.cc:
  Auto merged
sql/log_event.cc:
  Auto merged
sql/repl_failsafe.cc:
  Auto merged
sql/set_var.cc:
  Auto merged
sql/set_var.h:
  Auto merged
sql/sp_head.cc:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_cache.cc:
  Auto merged
sql/sql_class.cc:
  Auto merged
sql/sql_class.h:
  Auto merged
sql/sql_delete.cc:
  Auto merged
sql/sql_insert.cc:
  Auto merged
sql/sql_lex.cc:
  Auto merged
sql/sql_lex.h:
  Auto merged
sql/sql_prepare.cc:
  Auto merged
sql/sql_repl.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
sql/sql_show.cc:
  Auto merged
sql/sql_table.cc:
  Auto merged
sql/sql_update.cc:
  Auto merged
sql/sql_view.cc:
  Auto merged
sql/sql_yacc.yy:
  Auto merged
sql/table.h:
  Auto merged
support-files/mysql.spec.sh:
  Auto merged
configure.in:
  Manual merge.
include/my_dbug.h:
  Manual merge.
sql/mysql_priv.h:
  Manual merge.
sql/mysqld.cc:
  Manual merge.
sql/slave.cc:
  Manual merge.
sql/sql_parse.cc:
  Manual merge.

into  trift2.:/MySQL/M50/clone-5.0

into  trift2.:/MySQL/M50/test-help-5.0


mysql-test/t/help.test:
  Auto merged
mysql-test/r/help.result:
  Manual merge:
  5.0 has warnings "Field 'url' doesn't have a default value" which 4.1 doesn't have.

Shift the ID values up into a range where they will not collide with those
which we use for real data, when we fill the system tables.

Will be merged up to 5.0 where it is needed for 5.0.38.


mysql-test/r/help.result:
  Fix the result file according to the changed ID values in "help.test".
mysql-test/t/help.test:
  Now that (at least in 5.0) the system tables are filled with real data,
  inserting rows vith ID values 1 .. 5 will fail in release build tests (it did in 5.0.38)
  like it should already have done in customer installations.
  
  Shift the ID values up into a high area where they will not conflict,
  also make the distinct for the different kinds of values (= unique throughout the test).
  
  No change to the logic.

into  trift2.:/MySQL/M50/test-help-5.0

Shift the ID values up into a range where they will not collide with those
which we use for real data, when we fill the system tables.

Will be merged up to 5.0 where it is needed for 5.0.38.


mysql-test/t/help.test:
  Now that (at least in 5.0) the system tables are filled with real data,
  inserting rows vith ID values 1 .. 5 will fail in release build tests (it did in 5.0.38)
  like it should already have done in customer installations.
  
  Shift the ID values up into a high area where they will not conflict,
  also make the distinct for the different kinds of values (= unique throughout the test).
  
  No change to the logic.

into  quadxeon.mysql.com:/benchmarks/ext3/TOSAVE/tsmith/bk/mar20/mysql-5.0-release

into  quadxeon.mysql.com:/benchmarks/ext3/TOSAVE/tsmith/bk/mar20/b27231/50


sql/sql_class.cc:
  Auto merged

- Problem: data separators were copied to a fixed-size buffer
  on the stack; memcpy was used, without bounds checking; a
  server crash could result if long FIELDS ENCLOSED BY, etc.,
  was given
- Fix: write the separators directly, instead of copying to
  a buffer first (in select_export::send_data())


sql/sql_class.cc:
  In select_export::send_data(), write data separators
  directly, instead of copying into a fixed-size memory
  buffer before writing.  This avoids a buffer overflow
  when very large separators are specified.

  No need to set LICENSE or USE_SYMDIR from project files
make_win_bin_dist:
  Changed location of SQL initialization files to be "share/"


scripts/make_win_bin_dist:
  Changed location of SQL initialization files to be "share/"
VC++Files/libmysqld/libmysqld.vcproj:
  No need to set LICENSE or USE_SYMDIR from project files
VC++Files/mysqldemb/mysqldemb.vcproj:
  No need to set LICENSE or USE_SYMDIR from project files
VC++Files/mysys/mysys.vcproj:
  No need to set LICENSE or USE_SYMDIR from project files
VC++Files/sql/mysqld.vcproj:
  No need to set LICENSE or USE_SYMDIR from project files
VC++Files/vio/vio.vcproj:
  No need to set LICENSE or USE_SYMDIR from project files

  Removed accidently added my_winsem.c
make_win_bin_dist:
  Corrected test for relwithdebinfo target
mysql.sln:
  Specify that comp_err depends on zlib


VC++Files/mysys/mysys.vcproj:
  Removed accidently added my_winsem.c
VC++Files/mysql.sln:
  Specify that comp_err depends on zlib
scripts/make_win_bin_dist:
  Corrected test for relwithdebinfo target

  Restore accidently removed line


scripts/make_win_bin_dist:
  Restore accidently removed line

  Major cleanup of old Visual Studio project files, aligning engines etc


VC++Files/bdb/bdb.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/client/mysql.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/client/mysql_upgrade.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/client/mysqladmin.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/client/mysqlclient.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/client/mysqldump.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/client/mysqlimport.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/client/mysqlshow.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/client/mysqltest.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/comp_err/comp_err.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/dbug/dbug.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/heap/heap.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/innobase/innobase.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/libmysql/libmysql.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/libmysqld/examples/test_libmysqld.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/libmysqld/libmysqld.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/libmysqltest/myTest.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/my_print_defaults/my_print_defaults.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/myisam/myisam.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/myisam_ftdump/myisam_ftdump.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/myisamchk/myisamchk.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/myisamlog/myisamlog.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/myisammrg/myisammrg.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/myisampack/myisampack.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/mysql.sln:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/mysqlbinlog/mysqlbinlog.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/mysqlcheck/mysqlcheck.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/mysqldemb/mysqldemb.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/mysqlserver/mysqlserver.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/mysys/mysys.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/perror/perror.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/regex/regex.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/replace/replace.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/sql/gen_lex_hash.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/sql/mysqld.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/strings/strings.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/test1/test1.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/tests/mysql_client_test.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/thr_test/thr_test.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/vio/vio.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
VC++Files/zlib/zlib.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
extra/yassl/taocrypt/taocrypt.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
extra/yassl/yassl.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
ndb/src/cw/cpcc-win32/C++/CPC_GUI.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc
scripts/make_win_bin_dist:
  Major cleanup of old Visual Studio project files, aligning engines etc
server-tools/instance-manager/mysqlmanager.vcproj:
  Major cleanup of old Visual Studio project files, aligning engines etc

into  trift2.:/MySQL/M50/clone-5.0

netware/Makefile.am:
  "libmysql.imp" must survive a "make clean" for the NetWare builds.

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.0-release


scripts/make_win_bin_dist:
  Auto merged

  - Support both "release" and "relwithdebinfo" targets
  - Copy ".pdb" and ".pdb" files for the server and instance manager
  - Removed the examples directory, unsupported
  - Handle both old and new builds in the same script, "-debug" and "-nt"
    extensions, directory "data" and "share" in different location


scripts/make_win_bin_dist:
  - Support both "release" and "relwithdebinfo" targets
  - Copy ".pdb" and ".pdb" files for the server and instance manager
  - Removed the examples directory, unsupported
  - Handle both old and new builds in the same script, "-debug" and "-nt"
    extensions, directory "data" and "share" in different location

sql/item_cmpfunc.cc:
  Ensure both operands of a comparison are cast to "ulonglong", not just one only.
  Without this, some 64-bit big-endian hosts failed test "func_in" when 5.0.38 builds were started.
  
  Patch provided by Timothy.

 - Build sql files for netware from the mysql_system_tables*.sq files
 - Fix comments about mysql_create_system_tables.sh
 - Use mysql_install_db.sh to create system tables for mysql_test-run-shell
 - Fix mysql-test-run.pl to also look in share/mysql for the msyql_system*.sql files

Changeset coded today by Magnus Svensson, just the application to 5.0.38 is by Joerg Bruehe.


BitKeeper/deleted/.del-init_db.sql~e2b8d0c8390e8023:
  Delete: netware/init_db.sql
BitKeeper/deleted/.del-test_db.sql:
  Delete: netware/test_db.sql
BitKeeper/etc/ignore:
  Added netware/init_db.sql netware/test_db.sql to the ignore list
mysql-test/install_test_db.sh:
  Use mysql_install_db from install_test_db(which is used by mysql-test-run-shell)
  to install the system tables
mysql-test/mysql-test-run.pl:
  Look for the mysql_system_tables*.sql also in share/mysql
netware/Makefile.am:
  Build netware/init_db.sql and netware/test_db.sql from
  the sources in scripts/msyql_system_tables*.sql
scripts/make_binary_distribution.sh:
  netware/init_db.sql and netware/test_db.sql are now built by the Makefiles
  from the scripts/mysql_system_tables*.sql files
sql/mysql_priv.h:
  Update comment remindging to update the MySQL system table definitions
  when adding a new SQL_MODE
sql/sql_acl.h:
  Update comment reminding to update the MySQL System tables
  when changing the ACL defines

mysql-test/r/loaddata.result:
  Fix bug#27212:  Do not try to read a file which is not contained in a binary distribution,
  because it will be missing when the tests are run during release build or by a customer.
mysql-test/t/loaddata.test:
  Fix bug#27212:  Do not try to read a file which is not contained in a binary distribution,
  because it will be missing when the tests are run during release build or by a customer.

into  mysql.com:/home/svoj/devel/bk/mysql-5.0-engines

into  mockturtle.local:/home/dlenev/src/mysql-4.1-merge

into  mockturtle.local:/home/dlenev/src/mysql-5.0-merge

into  mockturtle.local:/home/dlenev/src/mysql-5.0-bg25966-2


sql/mysqld.cc:
  Auto merged

TABLE ... WRITE".

Memory and CPU hogging occured when connection which had to wait for table
lock was serviced by thread which previously serviced connection that was
killed (note that connections can reuse threads if thread cache is enabled).
One possible scenario which exposed this problem was when thread which
provided binlog dump to replication slave was implicitly/automatically
killed when the same slave reconnected and started pulling data through
different thread/connection.
The problem also occured when one killed particular query in connection
(using KILL QUERY) and later this connection had to wait for some table
lock.

This problem was caused by the fact that thread-specific mysys_var::abort
variable, which indicates that waiting operations on mysys layer should
be aborted (this includes waiting for table locks), was set by kill
operation but was never reset back. So this value was "inherited" by the
following statements or even other connections (which reused the same
physical thread). Such discrepancy between this variable and THD::killed
flag broke logic on SQL-layer and caused CPU and memory hogging.

This patch tries to fix this problem by properly resetting this member.

There is no test-case associated with this patch since it is hard to test
for memory/CPU hogging conditions in our test-suite.


sql/mysqld.cc:
  We should not forget to reset THD::mysys_var::abort after kill operation
  if we are going to use thread to which this operation was applied for
  handling of other connections.
sql/sp_head.cc:
  We should not forget to reset THD::mysys_var::abort after kill operation
  if we are going to use thread to which this operation was applied for
  handling of further statements.
sql/sql_parse.cc:
  We should not forget to reset THD::mysys_var::abort after kill operation
  if we are going to use thread to which this operation was applied for
  handling of further statements.

TABLE ... WRITE".

CPU hogging occured when connection which had to wait for table lock was
serviced by thread which previously serviced connection that was killed
(note that connections can reuse threads if thread cache is enabled).
One possible scenario which exposed this problem was when thread which
provided binlog dump to replication slave was implicitly/automatically
killed when the same slave reconnected and started pulling data through
different thread/connection.
In 5.* versions memory hogging was added to CPU hogging. Moreover in
those versions the problem also occured when one killed particular query
in connection (using KILL QUERY) and later this connection had to wait for
some table lock.

This problem was caused by the fact that thread-specific mysys_var::abort
variable, which indicates that waiting operations on mysys layer should
be aborted (this includes waiting for table locks), was set by kill
operation but was never reset back. So this value was "inherited" by the
following statements or even other connections (which reused the same
physical thread). Such discrepancy between this variable and THD::killed
flag broke logic on SQL-layer and caused CPU and memory hogging.

This patch tries to fix this problem by properly resetting this member.

There is no test-case associated with this patch since it is hard to test
for memory/CPU hogging conditions in our test-suite.


sql/mysqld.cc:
  We should not forget to reset THD::mysys_var::abort after kill operation
  if we are going to use thread to which this operation was applied for
  handling of other connections.