if cached query uses many tables

The problem was that query cache would not properly cache
queries which used 256 or more tables but yet would leave
behind query cache blocks pointing to freed (destroyed)
data. Later when invalidating (due to a truncate) query cache
would attempt to grab a lock which resided in the freed data,
leading to hangs or undefined behavior.

This was happening due to a improper return value from the
function responsible for registering the tables used in the
query (so the cache can be invalidated later if one of the
tables is modified). The function expected a return value of
type boolean (char, 8 bits) indicating success (1) or failure
(0) but the number of tables registered (unsigned int, 32 bits)
was being returned instead. This caused the function to return
failure for cases where it had actually succeed because when
a type (unsigned int) is converted to a narrower type (char),
the excess bits on the left are discarded. Thus if the 8
rightmost bits are zero, the return value will be 0 (failure).

The solution is to simply return true (1) only if the number of
registered table is greater than zero and false (0) otherwise.

mysql-test/r/query_cache_merge.result:
  Add test case result for Bug#33362
mysql-test/t/query_cache_merge.test:
  Add test case for Bug#33362
sql/sql_cache.cc:
  Return 1 or 0 depending on the number of registered tables.

Bug 36788 Multiple funcs_1 'trig' tests are failing on vanilla builds

Fix for this bug and additional improvements/fixes
In detail:
- Remove unicode attribute from several columns
  (unicode properties were nowhere needed/tested)
  of the table tb3
  -> The runnability of these tests depends no more on
     the availibility of some optional collations.
- Use a table tb3 with the same layout for all
  engines to be tested and unify the engine name
  within the protocols.
  -> <engine>_trig_<abc>.result have the same content
- Do not load data into tb3 if these rows have no
  impact on result sets
- Add tests for NDB (they exist already in 5.1)
- "--replace_result" at various places because
  NDB variants of tests failed with "random" row
  order in results
  This fixes a till now unknown weakness within the
  funcs_1 NDB tests existing in 5.1 and 6.0
- Fix the expected result of ndb_trig_1011ext
  which suffered from Bug 32656
  + disable this test
- funcs_1 could be executed with the mysql-test-run.pl
  option "--reorder", which saves some runtime by
  optimizing server restarts.
  Runtimes on tmpfs (one attempt only):
  with    reorder 132 seconds
  without reorder 183 seconds
- Adjust two "check" statements within func_misc.test
  which were incorrect (We had one run with result set
  difference though the server worked good.)
- minor fixes in comments

Upmerge of fix for this bug and a second similar problem
found during experimenting.

This replaces the first fix (already pushed to 5.1
and merged to 6.0) which
- failed in runs with the embedded server
- cannot be ported back to 5.0

Fix for this bug and a second similar problem
found during experimenting.

This replaces the first fix (already pushed to 5.1
and merged to 6.0) which
- failed in runs with the embedded server
- cannot be ported back to 5.0

sql/share/charsets/README:
  merged bug 36676 to 5.1-bugteam
strings/CHARSET_INFO.txt:
  merged bug 36676 to 5.1-bugteam

Thanks to Paul for preparing the up-to-date files
reflecting 4.1 changes.

Bug#36724 - Test funcs_1.<engine>_storedproc_02 needs to be updated
Bug#36726 - Test funcs_1.<engine>_storedproc failing - Needs to be updated on 5.1+

func_view bug:  re-records .result files to account for addition of charset and collation data 
                to SHOW CREATE VIEW output
storedproc bugs:  Added expected errors for those storedprocs that use SQLSTATE:00000
                  in their handlers.  re-recorded .result files to account for these
                  expected errors.

mysql-test/suite/funcs_1/r/innodb_func_view.result:
  Update result set for changes to SHOW CREATE VIEW output
mysql-test/suite/funcs_1/r/memory_func_view.result:
  Updated result set due to changes in SHOW CREATE VIEW output
mysql-test/suite/funcs_1/r/myisam_func_view.result:
  Updated result set due to changes in SHOW CREATE VIEW output

BUILD/compile-pentium-valgrind-max-no-ndb:
  Disable ndb.

There was a typo in a error check causing wrong thing to be ckecked 
and a possible error not being caught.
Fixed by using the correct variable to test for malloc() errors. 

tests/mysql_client_test.c:
  Bug #36887: fixed a typo

rpl_slave_status failed on pushbuild. The slave stopped with an
error. Adding sync_slave_with_master fixes the problem. Updated
test case. 

mysql-test/suite/rpl/r/rpl_slave_status.result:
  Updated result file.
mysql-test/suite/rpl/t/rpl_slave_status.test:
  - Added comment explaining what the test does.
  - Added sync_slave_with_master in two places where it was missing. This
    caused sporadic pushbuild errors.
  - Added wait_for_slave_to_{start,stop} after {START,STOP} SLAVE queries.
  - Removed 'drop table if exists' from setup code.
  - Replaced save_master_pos;connection slave;sync_with_master by
    sync_slave_with_master.
  - Replaced 'delete from mysql.user' by 'drop user'.
  - Wrapped 'show slave status' inside query_get_value(), so that only what
    we test is in the output.

   Bug#36345 Test 'func_misc' fails on RHAS3 x86_64
and a second similar problem within this test found
during experimenting.

mysql-test/r/status.result:
  reverted merging misstake
mysql-test/t/status.test:
  reverted merging misstake

  
The Diagnostic_area caused an assertion failure in debug mode when
the disk was full.
  
By setting the internal error handler to ignore errors caused by
underlying logging methods, the error is avoided.


sql/log.cc:
  MYSQL_QUERY_LOG::write uses IOCACHE for writing data. If writing fails 
  an error is pushed by the procedure my_error which in turn invokes
  the default error handler my_message_sql. When the error is set the
  Diagnostic_area status changes and later trigger an assertion on the
  next consecutive status change which happens by for example the 
  function my_ok(). By intercepting the error handler from the logger
  interface this error can be silenced.

The failing test case is depending on unnecessary status variable output
which changes based on build configuration. By reducing the output the test
becomes more stable.

mysql-test/r/status.result:
  Modified test case
mysql-test/t/disabled.def:
  Enabled status.test
mysql-test/t/status.test:
  Modified test case.

and table DDL changed after PREPARE" to pass in embedded mode.


mysql-test/r/ps.result:
  Update results (Bug#27430)
mysql-test/r/ps_ddl.result:
  Update results (Bug#27430)
mysql-test/t/ps.test:
  Add a test case for Bug#27430. ps.test is not run in --embedded-server,
  thus it now contains the part of the test for Bug#27430 that
  doesn't work in embedded server.
mysql-test/t/ps_ddl.test:
  Move a part of the test for Bug#27430 that doesn't work
  in embedded server to ps.test, that includes not_embedded.inc.

the local tree contains a fix for 
Bug#32748 "Inconsistent handling of assignments to 
general_log_file/slow_query_log_file",
which changes output of a number of tests.


mysql-test/r/general_log_file_basic.result:
  Update results (Bug#32748)
mysql-test/r/log_output_basic.result:
  Update the test with results of the fix for Bug#32748
mysql-test/r/slow_query_log_file_basic.result:
  Update the test with results of the fix for Bug#32748
mysql-test/t/general_log_file_basic.test:
  Adjust to take into account the fix for Bug#32748 
  (a port from 6.0-bugteam)
mysql-test/t/log_output_basic.test:
  Adjust to take into account the fix for Bug#32748 
  (a port from 6.0-bugteam)
mysql-test/t/slow_query_log_file_basic.test:
  Adjust to take into account the fix for Bug#32748 
  (a port from 6.0-bugteam)
tests/mysql_client_test.c:
  Fix a compilation warning.

after PREPARE"
Update test results after a merge with the main tree: the new minimum for 
the table definition cache is 256.


mysql-test/r/table_definition_cache_basic.result:
  Update test results: the new minimum for table definition cache is 256

 PREPARE", review fixes:
- make the patch follow the specification of WL#4166 and remove  
the new error that was originally introduced.
Now the client never gets an error from reprepare, unless it failed.
I.e. even if the statement at hand returns a completely different
result set, this is not considered a server error.
The C API library, that can not handle this situation, was modified to
return a client error.
Added additional test coverage.


include/errmsg.h:
  Add a new client side error: now when we automatically
  reprepare a statement, the new result set may contain a different
  number of columns.
include/mysql_com.h:
  Add a new server status to be sent to the client if the 
  number of columns in the result set is different.
libmysql/errmsg.c:
  Add a new error message.
libmysql/libmysql.c:
  Make the client library robust against a result set that
  contains a different number of columns from prepare time.
  Previously that could never happen, and we simply had an assert.
  That means in particular that all clients are advised to upgrade
  with transition to 5.1, if they are using prepared statements C API.
  Make mysql_stmt_store_result() and mysql_stmt_execute() robust against 
  "broken" statement handles (those that have an error).
sql/sql_parse.cc:
  Clear transient server status flags at start of statement more 
  systematically.
sql/share/errmsg.txt:
  Remove an error that is unused and is not part of any public release.
sql/sql_prepare.cc:
  Instead of returning an error in case the number of result set columns
  has changed, simply update the client in server status.
  That will allow modern clients automatically recover from an error.
tests/mysql_client_test.c:
  Add additional coverage to the cases when the number of result
  set columns changed as a result of reprepare.
  Cover conversion and truncation of result set columns.

The test is vulnerable because it does not check if slave has stopped at time
of the new session is requested `start slave;'

Fixed with deploying explicitly wait_for_slave_to_stop synchronization macro.

into  bodhi.(none):/opt/local/work/mysql-5.1-27430


Makefile.am:
  Auto merged
include/my_global.h:
  Auto merged
mysql-test/include/mix1.inc:
  Auto merged
sql/item.cc:
  Auto merged
sql/my_decimal.h:
  Auto merged
sql/mysqld.cc:
  Auto merged
sql/set_var.cc:
  Auto merged
sql/set_var.h:
  Auto merged
sql/sp.cc:
  Auto merged
sql/sp_head.cc:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_class.cc:
  Auto merged
sql/sql_class.h:
  Auto merged
sql/sql_parse.cc:
  Auto merged
sql/sql_table.cc:
  Auto merged
sql/sql_update.cc:
  Auto merged
sql/share/errmsg.txt:
  Auto merged
sql/sql_yacc.yy:
  Auto merged
libmysqld/CMakeLists.txt:
  Manual merge.
libmysqld/lib_sql.cc:
  Manual merge.
mysql-test/t/disabled.def:
  Manual merge.

into  bodhi.(none):/opt/local/work/mysql-5.1-27430


sql/sql_base.cc:
  Manual merge.

PREPARE": rename members, methods, classes to follow the spec 
(a code review request)


sql/mysql_priv.h:
  enum_metadata_type -> enum_table_ref_type
sql/sp_head.cc:
  Metadata_version_observer -> Reprepare_observer
sql/sql_base.cc:
  metadata -> table_ref
sql/sql_class.cc:
  Replace an abstract interface with a concrete implementation.
sql/sql_class.h:
  enum_metadata_type -> enum_table_ref_type
sql/sql_prepare.cc:
  Move implementation of Execute_observer to sql_class.cc and
  rename the class to Reprepare_observer.
  Use getters instead of direct access to the members.
sql/table.h:
  metadata -> table_ref

Add test target to the makefile that will cause all
statements to be re-prepared before execution.


Makefile.am:
  Add test-reprepare target. In combination with the
  --ps-protocol this will cause that every statement
  in the test suite be re-prepared before execution.
sql/sql_base.cc:
  Re-prepare each statement before execution.

into  mysql.com:/d2/hf/mysql-5.1-bugteam

  rpl_innodb_bug28430 disabled


mysql-test/suite/rpl/t/disabled.def:
  rpl_innodb_bug28430 disabled

into  host.loc:/work/bk/5.1-bugteam


sql/sql_update.cc:
  Auto merged