Please refer http://dev.mysql.com/doc/refman/5.1/en/news-5-1-50.html
for full changes .
InnoDB Notes:
InnoDB Plugin has been upgraded to version 1.0.11. This version is
considered of General Availability (GA) quality.
In this release, the InnoDB Plugin is included in source and binary
distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64),
generic Linux RPM packages, and any builds produced with the icc
compiler. It also does not work for FreeBSD 6 and HP-UX or for Linux
on generic ia64.
Bugs fixed:
Important Change: Replication: The LOAD DATA INFILE statement is now
considered unsafe for statement-based replication. When using
statement-based logging mode, the statement now produces a warning;
when using mixed-format logging, the statement is made using the
row-based format. (Bug#34283)
Partitioning: UPDATE and INSERT statements affecting partitioned
tables performed poorly when using row-based replication. (Bug#52517)
Partitioning: INSERT ON DUPLICATE KEY UPDATE statements performed
poorly on tables having many partitions. This was because the handler
function for reading a row from a specific index was not optimized in
the partitioning handler. (Bug#52455)
The server could crash on shutdown, if started with
--innodb-use-system-malloc=0. (Bug#55581)
GROUP BY operations used max_sort_length inconsistently. (Bug#55188)
Building MySQL on Solaris 8 x86 failed when using Sun Studio due to
gcc inline assembler code. (Bug#55061)
In debug builds, an assertion could be raised when the server tried to
send an OK packet to the client after having failed to detect errors
during processing of the WHERE condition of an UPDATE
statement. (Bug#54734)
The database server could crash when renaming a table that had active
transactions. (This issue only affected the database server when built
for debugging.) (Bug#54453)
The server could crash during the recovery phase of startup, if it
previously crashed while inserting BLOB or other large columns that
use off-page storage into an InnoDB table created with
ROW_FORMAT=REDUNDANT or ROW_FORMAT=COMPACT. (Bug#54408)
For an InnoDB table created with ROW_FORMAT=COMPRESSED or
ROW_FORMAT=DYNAMIC, a query using the READ UNCOMMITTED isolation level
could cause the server to stop with an assertion error, if BLOB or
other large columns that use off-page storage were being inserted at
the same time. (Bug#54358)
A client could supply data in chunks to a prepared statement parameter other than of type TEXT or BLOB using the mysql_stmt_send_long_data() C API function (or COM_STMT_SEND_LONG_DATA command). This led to a crash because other data types are not valid for long data. (Bug#54041)
mysql_secure_installation did not properly identify local accounts and
could incorrectly remove nonlocal root accounts. (Bug#54004)
Transactions could be incorrectly committed during recovery, rather
than rolled back, if the server crashed and was restarted after
performing ALTER TABLE...ADD PRIMARY KEY on an InnoDB table, or some
other operation that involves copying the entire table. (Bug#53756)
Portability problems in SHOW STATUS could lead to incorrect results on
some platforms. (Bug#53493)
Builds of MySQL generated a large number of warnings. (Bug#53445)
With lower_case_table_names set to a nonzero value, searches for table
or database names in INFORMATION_SCHEMA tables could produce incorrect
results. (Bug#53095)
The ABI check for MySQL failed to compile with gcc 4.5. (Bug#52514)
mysql_secure_installation sometimes failed to locate the mysql
client. (Bug#52274)
Reading a ucs2 data file with LOAD DATA INFILE was subject to three
problems. 1) Incorrect parsing of the file as ucs2 data, resulting in
incorrect length of the parsed string. This is fixed by truncating the
invalid trailing bytes (incomplete multibyte characters) when reading
from the file. 2) Reads from a proper ucs2 file did not recognize
newline characters. This is fixed by first checking whether a byte is
a newline (or any other special character) before reading it as a part
of a multibyte character. 3) When using user variables to hold column
data, the character set of the user variable was set incorrectly to
the database charset. This is fixed by setting it to the character set
specified in the LOAD DATA INFILE statement, if any. (Bug#51876)
Searches in INFORMATION_SCHEMA tables for rows matching a nonexistent
database produced an error instead of an empty query
result. (Bug#49542)
On FreeBSD, memory mapping for MERGE tables could fail if underlying
tables were empty. (Bug#47139)
The my_like_range_xxx() functions returned badly formed maximum
strings for Asian character sets, which caused problems for storage
engines. (Bug#45012)
A debugging assertion could be raised after a write failure to a
closed socket. (Bug#42496)
An assertion failure occurred within yaSSL for very long keys. (Bug#29784)
See also Bug#53463.
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