Holding on to the temporary inno hash index latch is an optimization in
many cases, but a pessimization in some others.

Release temporary latches for those corner cases we (or rather, or customers,
thanks!) have identified, that is, when we are about to do something that
might take a really long time, like REPAIR or filesort.

sql/ha_myisam.cc:
  Let go of (inno, for now) latch when doing MyISAM-repair.
  (optimize passes through repair.) ("Stuck" in "Repair with
  keycache".)
sql/sql_insert.cc:
  Let go of (inno, for now) latch when doing CREATE...SELECT
  in select_insert::send_data() -- it might take a while.
  ("stuck" in "Sending data")
sql/sql_select.cc:
  Release temporary (inno, for now) latch on
  - free_tmp_table() (this can take surprisingly long, "removing tmp table")
  - create_myisam_from_heap() (HEAP table overflowing onto disk as MyISAM,
    "converting HEAP to MyISAM")

The crash happens because of uninitialized
lex->ssl_cipher, lex->x509_subject, lex->x509_issuer variables.
The fix is to add initialization of these variables for
stored procedures&functions.


mysql-test/r/sp_notembedded.result:
  test result
mysql-test/t/sp_notembedded.test:
  test case
sql/sql_acl.cc:
  The crash happens because of uninitialized
  lex->ssl_cipher, lex->x509_subject, lex->x509_issuer variables.
  The fix is to add initialization of these variables for
  stored procedures&functions.

The crash happens due to wrong max_length value which is set on
Item_func_round::fix_length_and_dec() stage. The value is set to
args[0]->max_length which is too big in case of LONGTEXT(LONGBLOB) fields.
The fix is to set max_length using float_length() function.



mysql-test/r/func_math.result:
  test result
mysql-test/t/func_math.test:
  test case
sql/item_func.cc:
  The crash happens due to wrong max_length value which is set on
  Item_func_round::fix_length_and_dec() stage. The value is set to
  args[0]->max_length which is too big in case of LONGTEXT(LONGBLOB) fields.
  The fix is to set max_length using float_length() function.

BEGIN/COMMIT/ROLLBACK was subject to replication db rules, and
caused the boundary of a transaction not recognized correctly 
when these queries were ignored by the rules.

Fixed the problem by skipping replication db rules for these
statements.


sql/log_event.cc:
  Skip checking replication db rules for BEGIN/COMMIT/ROLLBACK statements

Bug#34309: '_PC' macro redefinition

For reasons that are now a mystery, we had defined a CPP symbol to
help ancient compilers work better (in some way that's lost to history).
This interferes with at least one modern compiler.

Now, don't define the _PC symbol.  Those other underscore-leading
symbols are suspect also, but at least the names aren't inscrutable.
Let's leave them for now.

The fix is to use case insensitive collation
for mysql client command search.



client/mysql.cc:
  The fix is to use case insensitive collation
  for mysql client command search.
mysql-test/r/mysql.result:
  test result
mysql-test/t/mysql.test:
  test case

On 64-bit Windows: querying MERGE table with keys may cause
server crash.The problem is generic and may affect any statement
accessing MERGE table cardinality values.
When MERGE engine was copying cardinality statistics, it was
using incorrect size of element in cardinality statistics array
(sizeof(ptr)==8 instead of sizeof(ulong)==4), causing access
of memory beyond of the allocated bounds.


sql/ha_myisam.cc:
  When copying rec_per_key array (an array of ulong) use proper
  size of element, that is sizeof(ulong).
sql/ha_myisammrg.cc:
  When copying rec_per_key array (an array of ulong) use proper
  size of element, that is sizeof(ulong).
sql/table.cc:
  When allocating rec_per_key array (an array of ulong) use proper
  size of element, that is sizeof(ulong).

            old_password() functions   
The PASSWORD() and OLD_PASSWORD() functions could lead to   
memory reads outside of an internal buffer when used with BLOB   
arguments.   
  
String::c_ptr() assumes there is at least one extra byte  
in the internally allocated buffer when adding the trailing  
'\0'.  This, however, may not be the case when a String object  
was initialized with externally allocated buffer.  
  
The bug was fixed by adding an additional "length" argument to  
make_scrambled_password_323() and make_scrambled_password() in  
order to avoid String::c_ptr() calls for  
PASSWORD()/OLD_PASSWORD().  
  
However, since the make_scrambled_password[_323] functions are  
a part of the client library ABI, the functions with the new  
interfaces were implemented with the 'my_' prefix in their  
names, with the old functions changed to be wrappers around  
the new ones to maintain interface compatibility.  

mysql-test/r/func_crypt.result:
  Added a test case for bug #44767.
mysql-test/t/func_crypt.test:
  Added a test case for bug #44767.
sql/item_strfunc.cc:
  Use the new my_make_scrambled_password*() to avoid 
  String::c_ptr().
sql/item_strfunc.h:
  Changed Item_func[_old]_password::alloc() interfaces so that
  we can use the new my_make_scrambled_password*() functions.
sql/mysql_priv.h:
  Added declarations for the new my_make_scrambled_password*() 
  functions.
sql/password.c:
  Added new my_make_scrambled_password*() functions with an
  additional "length" argument. Changed ones to be wrappers
  around the new ones to maintain interface compatibility.
sql/sql_yacc.yy:
  Utilize the new password hashing functions with additional length
  argument.

stop/start slave
      
When stopping and restarting the slave while it is replicating
temporary tables, the server would crash or raise an assertion
failure. This was due to the fact that although temporary tables are
saved between slave threads restart, the reference to the thread in
use (table->in_use) was not being properly updated when the restart
happened (it would still reference the old/invalid thread instead of
the new one).
      
This patch addresses this issue by resetting the reference to the new
slave thread on slave thread restart.

mysql-test/r/rpl_temporary.result:
  Result file.
mysql-test/t/rpl_temporary.test:
  Test case that checks that both failures go away.
sql/slave.cc:
  Changed slave.cc to reset sql_thd reference in temporary tables.

Created new .test file - mysqldump_restore that does test restore from mysqldump
output for a limited number of basic cases.
Create new .inc file - mysqldump.inc - renames original table and uses mysqldump
output to recreate the table, then uses diff_tables.inc to compare the two tables.
Backported include/diff_tables.inc to facilitate this testing.
New patch incorporating review feedback prior to push.

mysqldump.test - removed redundant call to include/have_log_bin.inc (was used twice in the test!)

Created new .test file - mysqldump_restore that does this for a limited number
of basic cases.
Created new .inc file - mysqldump.inc - renames original table and uses mysqldump
output to recreate the table, then uses diff_tables.inc to compare the two tables.
Backported include/diff_tables.inc to facilitate this testing.

Since max_allowed_packet is a read-only variable in 5.1 and up,
disable warnings to avoid unnecessary test case complication.

Set max_allowed_packet to get a consistent error message.

             warnings after uncompressed_length 
 
UNCOMPRESSED_LENGTH() did not validate its argument. In 
particular, if the argument length was less than 4 bytes, 
an uninitialized memory value was returned as a result. 
 
Since the result of COMPRESS() is either an empty string or 
a 4-byte length prefix followed by compressed data, the bug was 
fixed by ensuring that the argument of UNCOMPRESSED_LENGTH() is 
either an empty string or contains at least 5 bytes (as done in 
UNCOMPRESS()). This is the best we can do to validate input 
without decompressing. 

mysql-test/r/func_compress.result:
  Added a test case for bug #44796.
mysql-test/t/func_compress.test:
  Added a test case for bug #44796.
sql/item_strfunc.cc:
  Make sure that the argument of UNCOMPRESSED_LENGTH() contains 
  at least 5 bytes (as done in UNCOMPRESS()).

Internal InnoDN FK parser does not recognize '\'' as quotation symbol.
Suggested fix is to add '\'' symbol check for quotation condition
(dict_strip_comments() function).


innobase/dict/dict0dict.c:
  Internal InnoDN FK parser does not recognize '\'' as quotation symbol.
  Suggested fix is to add '\'' symbol check for quotation condition
  (dict_strip_comments() function).
mysql-test/r/innodb_mysql.result:
  test result
mysql-test/t/innodb_mysql.test:
  test case

           with a "HAVING" clause though query works

SELECT from views defined like:

  CREATE VIEW v1 (view_column)
    AS SELECT c AS alias FROM t1 HAVING alias

fails with an error 1356:
  View '...' references invalid table(s) or column(s)
  or function(s) or definer/invoker of view lack rights
  to use them


CREATE VIEW form with a (column list) substitutes
SELECT column names/aliases with names from a
view column list.
However, alias references in HAVING clause was
not substituted.


The Item_ref::print function has been modified
to write correct aliased names of underlying
items into VIEW definition generation/.frm file.


mysql-test/r/view.result:
  Added test file for bug #40825.
mysql-test/t/view.test:
  Added test file for bug #40825.
sql/item.cc:
  Bug#40825: Error 1356 while selecting from a view
             with a "HAVING" clause though query works
  
  The Item_ref::print function has been modified
  to write correct aliased names of underlying
  items into VIEW definition generation/.frm file.

  It turns out that this test case no longer fails with the discrepancy
  in numbers that was the original cause for disabling this test (and showed
  potential genuine issues with the query cache). Therefore
  this test is being enabled after some minor adjustment of error codes and
  messages.

Details:
1. Add missing "disconnect <session>"
2. Take care that the disconnects are finished when the test terminates
3. Replace error names by error numbers
4. Minor beautifying of script code

 
Field_time::get_time() did not initialize some members of 
MYSQL_TIME which led to valgrind warnings when those members 
were accessed in Protocol_simple::store_time(). 
 
It is unlikely that this bug could result in wrong data 
being returned, since Field_time::get_time() initializes the 
'day' member of MYSQL_TIME to 0, so the value of 'day' 
in Protocol_simple::store_time() would be 0 regardless 
of the values for 'year' and 'month'.

mysql-test/r/type_time.result:
  Added a test case for bug #44792.
mysql-test/t/type_time.test:
  Added a test case for bug #44792.
sql/field.cc:
  Field_time::get_time() did not initialize some members of 
  MYSQL_TIME which led to valgrind warnings when those members 
  were accessed in Protocol_simple::store_time().

In UNION if we use last SELECT without braces and this
SELECT have ORDER BY clause, such clause belongs to
global UNION. It is parsed like last SELECT
part and used further as 'unit->global_parameters->order_list' value.
During DESCRIBE EXTENDED we call select_lex->print_order() for
last SELECT where order fields refer to tmp table 
which already freed. It leads to crash.
The fix is clean up global_parameters->order_list
instead of fake_select_lex->order_list.


mysql-test/r/union.result:
  test result
mysql-test/t/union.test:
  test case
sql/sql_union.cc:
  In UNION if we use last SELECT without braces and this
  SELECT have ORDER BY clause, such clause belongs to
  global UNION. It is parsed like last SELECT
  part and used further as 'unit->global_parameters->order_list' value.
  During DESCRIBE EXTENDED we call select_lex->print_order() for
  last SELECT where order fields refer to tmp table 
  which already freed. It leads to crash.
  The fix is clean up global_parameters->order_list
  instead of fake_select_lex->order_list.

  UNIX sockets need to be on a path shorter than 70 characters on some older platofrms.
  MTRv1 tries to fix this by moving the socket to the $TMPDIR, however this causes
  issues with certain tests on Windows.

  Fixed by not applying any hacks on Windows - Windows does not need them.

UNIX sockets need to be on a path shorter than 70 characters on some older platofrms.
MTRv1 tries to fix this by moving the socket to the $TMPDIR, however this causes
issues with certain tests on Windows.

Fixed by not applying any hacks on Windows - Windows does not need them.