Update copyright comment in innochecksum.

OLD VALUE OF INPUT PARAMETER.

The user-visible problem was that CASE-control-flow function
(not CASE-statement) misbehaved in stored routines under some
circumstances. The problem resulted in a crash or wrong data
returned. The error happened when expressions in CASE-function
were not of the same character set.

A CASE-function should return values of the same character set
for all branches. Internally, that means a new Item-instance
for the CONVERT(... USING <some charset>)-function is added
to the item tree when needed. The problem was that such changes
were not properly recorded using THD::change_item_tree(),
thus dangling pointers remain in the item tree after
THD::rollback_item_tree_changes(), which lead to undefined
behavior (i.e. crash / wrong data) for subsequent executions of
the stored routine.

This bug was introduced by a patch for Bug 11753363
(44793 - CHARACTER SETS: CASE CLAUSE, UCS2 OR UTF32, FAILURE).

The fixed function is Item_func_case::fix_length_and_dec().
New CONVERT-items are added in agg_item_set_converter(),
which calls THD::change_item_tree().

The problem was that an intermediate array was passed
to agg_item_set_converter(). Thus, THD::change_item_tree() there
was called on intermediate objects.

Note: those intermediate objects are allocated on THD's
memory root, so it's Ok to put them into "changed item lists".

The fix is to track changes on the correct objects.

              UPDATED TWICE

For multi update it is not allowed to update a column
of a table if that table is accessed through multiple aliases
and either
1) the updated column is used as partitioning key
2) the updated column is part of the primary key 
   and the primary key is clustered

This check is done in unsafe_key_update().

The bug was that for case 2), it was checked whether
updated_column_number == table_share->primary_key 
However, the primary_key variable is the index number of the 
primary key, not a column number.

Prior to this bugfix, the first column was wrongly believed to be
the primary key. The columns covered by an index is found in
table->key_info[idx_number]->key_part. The bugfix is to check if
any of the columns in the keyparts of the primary key are
updated.

The user-visible effect is that for storage engines with
clustered primary key (e.g. InnoDB but not MyISAM) queries
like 
"UPDATE t1 AS A JOIN t2 AS B SET A.primkey=..."
will now error with 
"ERROR HY000: Primary key/partition key update is not allowed 
since the table is updated both as 'A' and 'B'." 
instead of 
"ERROR 1032 (HY000): Can't find record in 't1_tb'"
even if primkey is not the first column in the table. This 
was the intended behavior of bugfix 11764529.

can't parse relative paths "higher" than 3 levels up

When trying to LOAD DATA LOCAL INFILE using a relative path with 3 or
more levels up in the directory hierarchy, mysqld wrongly parses 
the path and as a consequence, can't find the file.

This bug was introduced by patch for bug#58205.
The reason for bug is that implementaiton of function cleanup_dirname()
doesn't take into account the begin of buffer being processed during
handling of path to file.

Some ut_a(!rec_offs_any_null_extern()) assertion failures are indicating
genuine BLOB bugs, others are bogus failures when rolling back incomplete
transactions at crash recovery. This needs more work, and until I get a
chance to work on it, other testing must not be disrupted by this.

revno 2995.37.209
revision id marko.makela@oracle.com-20110518120508-qhn7vz814vn77v5k
parent marko.makela@oracle.com-20110517121555-lmple24qzxqkzep4
timestamp: Wed 2011-05-18 15:05:08 +0300
message:
  Fix a bogus UNIV_SYNC_DEBUG failure in the fix of Bug #59641
  or Oracle Bug #11766513.

  trx_undo_free_prepared(): Do not acquire or release trx->rseg->mutex.
  This code is invoked in the single-threaded part of shutdown, therefore
  a mutex is not needed.

Issue:
When libmysqld/example/mysql_embedded is executed, it was getting abort. Its a
regression as it was working in 5.1 and failed in 5.5. Issue is there because 
remaining_argc/remaining_argv were not getting assigned correctly in 
init_embedded_server() which were being used later in init_common_variable().

Solution:
Rectified code to pass correct argc/argv to be used in init_common_variable().

COPYRIGHT NOTICE

Fixed copyright headers of updated files.

               COLUMNS IN VIEWS

Issue:
charset value for a Column, returned by MYSQL_LIST_FIELDS(), was not same
for Table and View. This was because, for view, field charset was not being
returned.

Solution:
Added definition of function "charset_for_protocol()" in calss 
Item_ident_for_show to return field charset value.