On shutdown(), Windows can drop traffic still queued for sending even if that
wasn't specifically requested. As a result, fatal errors (those after
signaling which the server will drop the connection) were sometimes only
seen as "connection lost" on the client side, because the server-side
shutdown() erraneously discarded the correct error message before sending
it.

If on Windows, we now use the Windows API to access the (non-broken) equivalent
of shutdown().

Backport from trunk

error LNK2001: unresolved external symbol _debug_sync_C_callback_ptr

OF WIDE RECORDS

row_ins_index_entry_low(), row_upd_clust_rec(): Make a redo log
checkpoint if a DEBUG flag is set. Add DEBUG_SYNC around
btr_store_big_rec_extern_fields().

rb:946 approved by Jimmy Yang

Before killing the server, tell mysql-test-run that it is to be expected.

Discussed with Bjorn Munch on IM.

$SUBJ$
1. Took a diff between the previous base version and the
mysql sources.
2. Added the new 2.1.4 base version.
3. Reviewed and re-applied the diff from step #1.

AND 5.5 YASSL FIXES.

Took the 5.5 yassl directory and moved it to the 5.1 tree, while
preserving the makefiles.

AND 5.5 YASSL FIXES.

Took the 5.5 yassl code and applied it to the 5.0 codebase, keeping the
compilation files.

            
During FIC error handling the trx->error_state was not being set to DB_SUCCESS
after failure, before attempting the next DDL SQL operation. This reset to
DB_SUCCESS is somewhat of a requirement though not explicitly stated anywhere.
The fix is to reset it to DB_SUCCESS in row0merge.cc if row_merge_rename_indexes
or row_merge_drop_index functions fail, also reset to DB_SUCCESS at trx commit.
				          
rb://935 Approved by Jimmy Yang.

IS EXECUTED TWICE FROM P

This bug is a duplicate of bug 12567331, which was pushed to the
optimizer backporting tree on 2011-06-11. This is just a back-port of
the fix. Both test cases are included as they differ somewhat.

GRACEFUL SHUTDOWN

During startup mysql picks up .frm files from the tmpdir directory and
tries to drop those tables in the storage engine.

The problem is that when tmpdir ends in / then ha_innobase::delete_table()
is passed a string like "/var/tmp//#sql123", then it wrongly normalizes it
to "/#sql123" and calls row_drop_table_for_mysql() which of course fails
to delete the table entry from the InnoDB dictionary cache.
ha_innobase::delete_table() returns an error but nevertheless mysql wipes
away the .frm file and the entry in the InnoDB dictionary cache remains
orphaned with no easy way to remove it.

The "no easy" way to remove it is to create a similar temporary table again,
copy its .frm file to tmpdir under "#sql123.frm" and restart mysqld with
tmpdir=/var/tmp (no trailing slash) - this way mysql will pick the .frm file
after restart and will try to issue drop table for "/var/tmp/#sql123"
(notice do double slash), ha_innobase::delete_table() will normalize it to
"tmp/#sql123" and row_drop_table_for_mysql() will successfully remove the
table entry from the dictionary cache.

The solution is to fix normalize_table_name_low() to normalize things like
"/var/tmp//table" correctly to "tmp/table".

This patch also adds a test function which invokes
normalize_table_name_low() with various inputs to make sure it works
correctly and a mtr test that calls this test function.

Reviewed by:	Marko (http://bur03.no.oracle.com/rb/r/929/)

                      CORRUPTED WHEN RUN CONCURRENTLY WITH

ISSUE: Table corruption due to concurrent queries.
       Different threads running check, repair query
       along with insert. Locks not properly acquired
       in repair query. Rows are inserted inbetween
       repair query.

SOLUTION: Mutex lock is acquired before the
          repair call. Concurrent queries wont
          effect the call to repair.

Recording correct test results.

modified:
  mysql-test/suite/engines/funcs/r/db_alter_collate_ascii.result
  mysql-test/suite/engines/funcs/r/db_alter_collate_utf8.result

row_merge_buf_write(): Relax the bogus assertion.

                      CASES RESETS DATA POINTER TO SMAL

ISSUE: Myisamchk doing sort recover
       on a table reduces data_file_length.
       Maximum size of data file decreases,
       lesser number of rows are stored.

SOLUTION: Size of data_file_length is
          fixed to the original length.

                      CASES RESETS DATA POINTER TO SMAL

ISSUE: Myisamchk doing sort recover
       on a table reduces data_file_length.
       Maximum size of data file decreases,
       lesser number of rows are stored.

SOLUTION: Size of data_file_length is
          fixed to the original length.

rb://914
approved by: Marko Makela

Poll in fil_rename_tablespace() after setting ::stop_ios flag can
result in a hang because the other thread actually dispatching the IO
won't wake IO helper threads or flush the tablespace before starting
wait in fil_mutex_enter_and_prepare_for_io().

No commit message

Fix for #36428/#38364 backported into 5.0.

      KEY HANDLING ON SUBSEQUENT CREATE TABLE IF NOT EXISTS
      
      PROBLEM:
      --------
      Consider a SP routine which does CREATE TABLE
      with REFERENCES clause. The first call to this routine
      invokes parser and the parsed items are cached, so as 
      to avoid parsing for the second execution of the routine.
      
      It is obsevered that valgrind reports a warning
      upon read of thd->lex->alter_info->key_list->Foreign_key object,
      which seem to be pointing to a invalid memory address
      during second time execution of the routine. Accessing this object
      theoretically could cause a crash.
      
      ANALYSIS:
      ---------
      The problem stems from the fact that for some reason
      elements of ref_columns list in thd->lex->alter_info->
      key_list->Foreign_key object are changed to point to
      objects allocated on runtime memory root.
      
      During the first execution of routine we create
      a copy of thd->lex->alter_info object.
      As part of this process we create a clones of objects in
      Alter_info::key_list and of Foreign_key object in particular.
      Then Foreign_key object is cloned for some reason we
      perform shallow copies of both Foreign_key::ref_columns
      and Foreign_key::columns list. So new instance of 
      Foreign_key object starts to SHARE contents of ref_columns
      and columns list with the original instance.
      After that as part of cloning process we call
      list_copy_and_replace_each_value() for elements of
      ref_columns list. As result ref_columns lists in both
      original and cloned Foreign_key object start to contain
      pointers to Key_part_spec objects allocated on runtime
      memory root because of shallow copy.
      
      So when we start copying of thd->lex->alter_info object
      during the second execution of stored routine we indeed
      encounter pointer to the Key_part_spec object allocated
      on runtime mem-root which was cleared during at the end
      of previous execution. This is done in sp_head::execute(), 
      by a call to free_root(&execute_mem_root,MYF(0));
      As result we get valgrind warnings about accessing 
      unreferenced memory.
      
      FIX:
      ----
      The safest solution to this problem is to 
      fix Foreign_key(Foreign_key, MEM_ROOT) constructor to do
      a deep copy of columns lists, similar to Key(Key, MEM_ROOT) 
      constructor.

Bug#13011410 CRASH IN FILESORT CODE WITH GROUP BY/ROLLUP

The assert in 13580775 is visible in 5.6 only, 
but shows that all versions are vulnerable.
13011410 crashes in all versions.

filesort tries to re-use the sort buffer between invocations in order to save
malloc/free overhead.
The fix for Bug 11748783 - 37359: FILESORT CAN BE MORE EFFICIENT.
added an assert that buffer properties (num_records, record_length) are
consistent between invocations. Indeed, they are not necessarily consistent.
  
Fix: re-allocate the sort buffer if properties change.