MySQL Community Server 5.6.2 has been released (part 2 - bug fixes)

Dear MySQL users,

This is the list of bug fixes. For the functional enhancements, see part
1 of this mail:

Bugs fixed:

* Performance: InnoDB Storage Engine: An UPDATE statement for an
InnoDB table could be slower than necessary if it changed a
column covered by a prefix index, but did not change the
prefix portion of the value. The fix improves performance for
InnoDB 1.1 in MySQL 5.5 and higher, and the InnoDB Plugin for
MySQL 5.1. (Bug #58912, Bug #11765900)

* Incompatible Change: When auto_increment_increment is greater
than one, values generated by a bulk insert that reaches the
maximum column value could wrap around rather producing an
overflow error.
As a consequence of the fix, it is no longer possible for an
auto-generated value to be equal to the maximum BIGINT
UNSIGNED value. It is still possible to store that value
manually, if the column can accept it. (Bug #39828, Bug
#11749800)

* Important Change: Partitioning: Date and time functions used
as partitioning functions now have the types of their operands
checked; use of a value of the wrong type is now disallowed in
such cases. In addition, EXTRACT(WEEK FROM col), where col is
a DATE or DATETIME column, is now disallowed altogether
because its return value depends on the value of the
default_week_format system variable. (Bug #54483, Bug
#11761948)
See also Bug #57071, Bug #11764255.

* Important Change: Replication: The CHANGE MASTER TO statement
required the value for RELAY_LOG_FILE to be an absolute path,
while the MASTER_LOG_FILE path could be relative.
The inconsistent behavior is resolved by permitting relative
paths for RELAY_LOG_FILE, and by using the same basename for
RELAY_LOG_FILE as for MASTER_LOG_FILE. For more information,
see Section 12.5.2.1, "CHANGE MASTER TO Syntax." (Bug #12190,
Bug #11745232)

* Partitioning: InnoDB Storage Engine: The partitioning handler
did not pass locking information to a table's storage engine
handler. This caused high contention and thus slower
performance when working with partitioned InnoDB tables. (Bug
#59013)

* InnoDB Storage Engine: The presence of a double quotation mark
inside the COMMENT field for a column could prevent a foreign
key constraint from being created properly. (Bug #59197, Bug
#11766154)

* InnoDB Storage Engine: It was not possible to query the
information_schema.innodb_trx table while other connections
were running queries involving BLOB types. (Bug #55397, Bug
#11762763)

* Partitioning: Failed ALTER TABLE ... PARTITION statements
could cause memory leaks. (Bug #56380, Bug #11763641)
See also Bug #46949, Bug #11755209, Bug #56996, Bug #11764187.

* Replication: When using the statement-based logging format,
INSERT ON DUPLICATE KEY UPDATE and INSERT IGNORE statements
affecting transactional tables that did not fail were not
written to the binary log if they did not insert any rows.
(With statement-based logging, all successful statements
should be logged, whether they do or do not cause any rows to
be changed.) (Bug #59338, Bug #11766266)

* Replication: Formerly, STOP SLAVE stopped the slave I/O thread
first and then stopped the slave SQL thread; thus, it was
possible for the I/O thread to stop after replicating only
part of a transaction which the SQL thread was executing, in
which case---if the transaction could not be rolled back
safely---the SQL thread could hang.
Now, STOP SLAVE stops the slave SQL thread first and then
stops the I/O thread; this guarantees that the I/O thread can
fetch any remaining events in the transaction that the SQL
thread is executing, so that the SQL thread can finish the
transaction if it cannot be rolled back safely. (Bug #58546,
Bug #11765563)

* Replication: mysqlbinlog printed USE statements to its output
only when the default database changed between events. To
illustrate how this could cause problems, suppose that a user
issued the following sequence of statements:
CREATE DATABASE mydb;
USE mydb;
CREATE TABLE mytable (column_definitions);
DROP DATABASE mydb;
CREATE DATABASE mydb;
USE mydb;
CREATE TABLE mytable (column_definitions);
When played back using mysqlbinlog, the second CREATE TABLE
statement failed with Error: No Database Selected because the
second USE statement was not played back, due to the fact that
a database other than mydb was never selected.
This fix insures that mysqlbinlog outputs a USE statement
whenever it reads one from the binary log. (Bug #50914, Bug
#11758677)

* Replication: The --help text for mysqlbinlog now indicates
that the --verbose (-v) option outputs pseudo-SQL that is not
necessarily valid SQL and cannot be guaranteed to work
verbatim in MySQL clients. (Bug #47557, Bug #11755743)

* An assertion was raised if an XA COMMIT was issued when an XA
transaction had already encountered an error (such as a
deadlock) that required the transaction to be rolled back.
(Bug #59986, Bug #11766788)

* On some systems, debug builds of comp_err.c could fail due to
an uninitialized variable. (Bug #59906, Bug #11766729)

* Attempting to create a spatial index on a CHAR column longer
than 31 bytes led to an assertion failure if the server was
compiled with safemutex support. (Bug #59888, Bug #11766714)

* Aggregation followed by a subquery could produce an incorrect
result. (Bug #59839, Bug #11766675)

* The Performance Schema did not update status handler status
variables, so SHOW STATUS LIKE '%handler%' produced
undercounted values. (Bug #59799, Bug #11766645)

* Internally, XOR items partially behaved like functions and
partially as conditions. This resulted in inconsistent
handling and crashes. The issue is fixed by consistently
treating XOR items as functions. (Bug #59793, Bug #11766642)

* An incorrect character set pointer passed to
my_strtoll10_mb2() caused an assertion to be raised. (Bug
#59648, Bug #11766519)

* DES_DECRYPT() could crash if the argument was not produced by
DES_ENCRYPT(). (Bug #59632, Bug #11766505)

* The server and client did not always properly negotiate
authentication plugin names. (Bug #59453, Bug #11766356)

* --autocommit=ON did not work (it set the global autocommit
value to 0, not 1). (Bug #59432, Bug #11766339)

* mysqldump did not quote database names in ALTER DATABASE
statements in its output, which could cause an error at reload
time for database names containing a dash. (Bug #59398, Bug
#11766310)

* If filesort fell back to an ordinary sort/merge, it could fail
to handle memory correctly. (Bug #59331, Bug #11766260)

* Comparisons of aggregate values with TIMESTAMP values were
incorrect. (Bug #59330, Bug #11766259)

* The "greedy" query plan optimizer failed to consider the size
of intermediate query results when calculating the cost of a
query. This could result in slowly executing queries when
there are much faster execution plans available. (Bug #59326,
Bug #11766256)

* A query of the following form returned an incorrect result,
where the values for col_name in the result set were entirely
replaced with NULL values:
SELECT DISTINCT col_name ... ORDER BY col_name DESC;
(Bug #59308, Bug #11766241)

* The MYSQL_HOME environment variable was being ignored. (Bug
#59280, Bug #11766219)

* SHOW PRIVILEGES did not display a row for the PROXY privilege.
(Bug #59275, Bug #11766216)

* SHOW PROFILE could truncate source file names or fail to show
function names. (Bug #59273, Bug #11766214)

* For DIV expressions, assignment of the result to multiple
variables could cause a server crash. (Bug #59241, Bug
#11766191)
See also Bug #8457, Bug #11745058.

* MIN(year_col) could return an incorrect result in some cases.
(Bug #59211, Bug #11766165)

* With index condition pushdown enabled, a join could produce an
extra row due to parts of the select condition for the second
table in the join not being evaluated. (Bug #59186, Bug
#11766144)

* DELETE or UPDATE statements could fail if they used DATE or
DATETIME values with a year, month, or day part of zero. (Bug
#59173)

* The ESCAPE clause for the LIKE operator allows only
expressions that evaluate to a constant at execution time, but
aggregate functions were not being rejected. (Bug #59149, Bug
#11766110)

* Valgrind warnings about uninitialized variables were
corrected. (Bug #59145, Bug #11766106)

* Memory leaks detected by Valgrind, some of which could cause
incorrect query results, were corrected. (Bug #59110, Bug
#11766075)

* mysqlslap failed to check for a NULL return from
mysql_store_result() and crashed trying to process the result
set. (Bug #59109, Bug #11766074)

* There was an erroneous restriction on file attributes for LOAD
DATA INFILE. (Bug #59085, Bug #11766052)

* SHOW CREATE TRIGGER failed if there was a temporary table with
the same name as the trigger subject table. (Bug #58996, Bug
#11765972)

* The DEFAULT_CHARSET and DEFAULT_COLLATION CMake options did
not work. (Bug #58991, Bug #11765967)

* In a subquery, a UNION with no referenced tables (or only a
reference to the virtual table dual) did not allow an ORDER BY
clause. (Bug #58970, Bug #11765950)

* OPTIMIZE TABLE for an InnoDB table could raise an assertion if
the operation failed because it had been killed. (Bug #58933,
Bug #11765920)

* If max_allowed_packet was set larger than 16MB, the server
failed to reject too-large packets with "Packet too large"
errors. (Bug #58887, Bug #11765878)

* With index condition pushdown enabled, incorrect results were
returned for queries on MyISAM tables involving HAVING and
LIMIT, when the column in the WHERE condition contained NULL.
(Bug #58838, Bug #11765835)

* An uninitialized variable for the index condition pushdown
access method could result in a server crash or Valgrind
warnings. (Bug #58837, Bug #11765834)

* A NOT IN predicate with a subquery containing a HAVING clause
could retrieve too many rows, when the subquery itself
returned NULL. (Bug #58818, Bug #11765815)

* Running a query against an InnoDB table twice, first with
index condition pushdown enabled and then with it disabled,
could produce different results. (Bug #58816, Bug #11765813)

* An assertion was raised if a stored routine had a DELETE
IGNORE statement that failed but due to the IGNORE had not
reported any error. (Bug #58709, Bug #11765717)

* WHERE conditions of the following forms were evaluated
incorrectly and could return incorrect results:
WHERE null-valued-const-expression NOT IN (subquery)
WHERE null-valued-const-expression IN (subquery) IS UNKNOWN
(Bug #58628, Bug #11765642)

* Issuing EXPLAIN EXTENDED for a query that would use condition
pushdown could cause mysqld to crash. (Bug #58553, Bug
#11765570)

* An OUTER JOIN query using WHERE column IS NULL could return an
incorrect result. (Bug #58490, Bug #11765513)

* Starting the server with the --defaults-file=file_name option,
where the file name had no extension, caused a server crash.
(Bug #58455, Bug #11765482)

* Outer joins with an empty table could produce incorrect
results. (Bug #58422, Bug #11765451)

* In debug builds, SUBSTRING_INDEX(FORMAT(...), FORMAT(...))
could cause a server crash. (Bug #58371, Bug #11765406)

* When mysqladmin was run with the --sleep and --count options,
it went into an infinite loop executing the specified command.
(Bug #58221, Bug #11765270)

* Some string manipulating SQL functions use a shared string
object intended to contain an immutable empty string. This
object was used by the SQL function SUBSTRING_INDEX() to
return an empty string when one argument was of the wrong
datatype. If the string object was then modified by the SQL
function INSERT(), undefined behavior ensued. (Bug #58165, Bug
#11765225)

* Condition pushdown optimization could push down conditions
with incorrect column references. (Bug #58134, Bug #11765196)

* injector::transaction did not have support for rollback. (Bug
#58082, Bug #11765150)

* Parsing nested regular expressions could lead to recursion
resulting in a stack overflow crash. (Bug #58026, Bug
#11765099)

* The fix for Bug#25192 caused load_defaults() to add an
argument separator to distinguish options loaded from
configure files from those provided on the command line,
whether or not the application needed it. (Bug #57953, Bug
#11765041)
See also Bug #11746296.

* The mysql client went into an infinite loop if the standard
input was a directory. (Bug #57450, Bug #11764598)

* If a multiple-table update updated a row through two aliases
and the first update physically moved the row, the second
update failed to locate the row. This resulted in different
errors depending on storage engine, although these errors did
not accurately describe the problem:

+ MyISAM: Got error 134 from storage engine

+ InnoDB: Can't find record in 'tbl'
For MyISAM, which is nontransactional, the update executed
first was performed but the second was not. In addition, for
two equal multiple-table update statements, one could succeed
and the other fail depending on whether the record actually
moved, which is inconsistent.
Now such an update returns an error if it will update a table
through multiple aliases, and perform an update that may
physically more the row in at least one of these aliases. (Bug
#57373, Bug #11764529, Bug #55385, Bug #11762751)

* SHOW WARNINGS output following EXPLAIN EXTENDED could include
unprintable characters. (Bug #57341, Bug #11764503)

* Outer joins on a unique key could return incorrect results.
(Bug #57034, Bug #11764219)

* For a query that used a subquery that included GROUP BY inside
a < ANY() construct, no rows were returned when there should
have been. (Bug #56690, Bug #11763918)

* Some RPM installation scripts used a hardcoded value for the
data directory, which could result in a failed installation
for users who have a nonstandard data directory location. The
same was true for other configuration values such as the PID
file name. (Bug #56581, Bug #11763817)

* On FreeBSD and OpenBSD, the server incorrectly checked the
range of the system date, causing legal values to be rejected.
(Bug #55755, Bug #11763089)

* If one connection locked the mysql.func table using either
FLUSH TABLES WITH READ LOCK or LOCK TABLE mysql.func WRITE and
a second connection tried to either create or drop a UDF
function, a deadlock occurred when the first connection tried
to use a UDF function. (Bug #53322, Bug #11760878)

* DISTINCT aggregates on DECIMAL UNSIGNED fields could trigger
an assertion. (Bug #52171, Bug #11759827)

* On FreeBSD, if mysqld was killed with a SIGHUP signal, it
could corrupt InnoDB .ibd files. (Bug #51023, Bug #11758773)

* An assertion could be raised if -1 was inserted into an
AUTO_INCREMENT column by a statement writing more than one
row. (Bug #50619, Bug #11758417)

* A query that contained an aggregate function but no GROUP BY
clause was implicitly grouped. But implicitly grouped queries
return zero or one row, so ordering does not make sense. (Bug
#47853)

* The parser failed to initialize some internal objects
properly, which could cause a server crash in the cleanup
phase after statement execution. (Bug #47511, Bug #11755703)

* When CASE ... WHEN arguments had different character sets,
8-bit values could be referenced as utf16 or utf32 values,
causing an assertion to be raised. (Bug #44793, Bug #11753363)

* When using ExtractValue() or UpdateXML(), if the XML to be
read contained an incomplete XML comment, MySQL read beyond
the end of the XML string when processing, leading to a crash
of the server. (Bug #44332, Bug #11752979)

* Bitmap functions used in one thread could change bitmaps used
by other threads, causing an assertion to be raised. (Bug
#43152, Bug #11752069)

* DATE_ADD() and DATE_SUB() return a string if the first
argument is a string, but incorrectly returned a binary
string. Now they return a character string with a collation of
connection_collation. (Bug #31384, Bug #11747221)

* Incompatible Change: Replication: The behavior of INSERT
DELAYED statements when using statement-based replication has
changed as follows:
Previously, when using binlog_format=STATEMENT, a warning was
issued in the client when executing INSERT DELAYED; now, no
warning is issued in such cases.
Previously, when using binlog_format=STATEMENT, INSERT DELAYED
was logged as INSERT DELAYED; now, it is logged as an INSERT,
without the DELAYED option.
However, when binlog_format=STATEMENT, INSERT DELAYED
continues to be executed as INSERT (without the DELAYED
option). The behavior of INSERT DELAYED remains unchanged when
using binlog_format=ROW: INSERT DELAYED generates no warnings,
is executed as INSERT DELAYED, and is logged using the
row-based format.
This change also affects binlog_format=MIXED, because INSERT
DELAYED is no longer considered unsafe. Now, when the logging
format is MIXED, no switch to row-based logging occurs. This
means that the statement is logged as a simple INSERT (that
is, without the DELAYED option), using the statement-based
logging format. (Bug #54579, Bug #11762035)
See also Bug #56678, Bug #11763907, Bug #57666.
This regression was introduced by Bug #39934, Bug #11749859.

* Incompatible Change: Replication: When determining whether to
replicate a CREATE DATABASE, DROP DATABASE, or ALTER DATABASE
statement, database-level options now take precedence over any
--replicate-wild-do-table options. In other words, when trying
to replicate one of these statements,
--replicate-wild-do-table options are now checked if and only
if there are no database-level options that apply to the
statement. (Bug #46110, Bug #11754498)

* Incompatible Change: Starvation of FLUSH TABLES WITH READ LOCK
statements occurred when there was a constant load of
concurrent DML statements in two or more connections. Deadlock
occurred when a connection that had some table open through a
HANDLER statement tried to update data through a DML statement
while another connection tried to execute FLUSH TABLES WITH
READ LOCK concurrently.
These problems resulted from the global read lock
implementation, which was reimplemented with the following
consequences:

+ To solve deadlock in event-handling code that was exposed
by this patch, the LOCK_event_metadata mutex was replaced
with metadata locks on events. As a result, DDL
operations on events are now prohibited under LOCK
TABLES. This is an incompatible change.

+ The global read lock (FLUSH TABLES WITH READ LOCK) no
longer blocks DML and DDL on temporary tables. Before
this patch, server behavior was not consistent in this
respect: In some cases, DML/DDL statements on temporary
tables were blocked; in others, they were not. Since the
main use cases for FLUSH TABLES WITH READ LOCK are
various forms of backups and temporary tables are not
preserved during backups, the server now consistently
allows DML/DDL on temporary tables under the global read
lock.

+ The set of thread states has changed:
o Waiting for global metadata lock is replaced by
Waiting for global read lock.
o Previously, Waiting for release of readlock was used
to indicate that DML/DDL statements were waiting for
release of a read lock and Waiting to get readlock
was used to indicate that FLUSH TABLES WITH READ
LOCK was waiting to acquire a global read lock. Now
Waiting for global read lock is used for both cases.
o Previously, Waiting for release of readlock was used
for all statements that caused an explicit or
implicit commit to indicate that they were waiting
for release of a read lock and Waiting for all
running commits to finish was used by FLUSH TABLES
WITH READ LOCK. Now Waiting for commit lock is used
for both cases.
o There are two other new states, Waiting for trigger
metadata lock and Waiting for event metadata lock.
(Bug #57006, Bug #11764195, Bug #54673, Bug #11762116)

* Incompatible Change: CREATE TABLE statements (including CREATE
TABLE ... LIKE) are now prohibited whenever a LOCK TABLES
statement is in effect. (Bug #42546, Bug #11751609)

* InnoDB Storage Engine: Replication: If the master had
innodb_file_per_table=OFF, innodb_file_format=Antelope (and
innodb_strict_mode=OFF), or both, certain CREATE TABLE
options, such as KEY_BLOCK_SIZE, were ignored. This could
allow master to avoid raising ER_TOO_BIG_ROWSIZE errors.
However, the ignored CREATE TABLE options were still written
into the binary log, so that, if the slave had
innodb_file_per_table=ON and innodb_file_format=Barracuda, it
could encounter an ER_TOO_BIG_ROWSIZE error while executing
the record from the log, causing the slave SQL thread to abort
and replication to fail.
In the case where the master was running MySQL 5.1 and the
slave was MySQL 5.5 (or later), the failure occurred when both
master and slave were running with default values for
innodb_file_per_table and innodb_file_format. This could cause
problems during upgrades.
To address this issue, the default values for
innodb_file_per_table and innodb_file_format are reverted to
the MySQL 5.1 default values---that is, OFF and Antelope,
respectively. (Bug #56318, Bug #11763590)

* InnoDB Storage Engine: With binary logging enabled, InnoDB
could halt during crash recovery with a message referring to a
transaction ID of 0. (Bug #54901, Bug #11762323)

* Replication: Due to changes made in MySQL 5.5.3, settings made
in the binlog_cache_size and max_binlog_cache_size server
system variables affected both the binary log statement cache
(also introduced in that version) and the binary log
transactional cache (formerly known simply as the binary log
cache). This meant that the resources used as a result of
setting either or both of these variables were double the
amount expected. To rectify this problem, these variables now
affect only the transactional cache. The fix for this issue
also introduces two new system variables
binlog_stmt_cache_size and max_binlog_stmt_cache_size, which
affect only the binary log statement cache.
In addition, the Binlog_cache_use status variable was
incremented whenever either cache was used, and
Binlog_cache_disk_use was incremented whenever the disk space
from either cache was used, which caused problems with
performance tuning of the statement and transactional caches,
because it was not possible to determine which of these was
being exceeded when attempting to troubleshoot excessive disk
seeks and related problems. This issue is solved by changing
the behavior of these two status variables such that they are
incremented only in response to usage of the binary log
transactional cache, as well as by introducing two new status
variables Binlog_stmt_cache_use and
Binlog_stmt_cache_disk_use, which are incremented only by
usage of the binary log statement cache.
For more information, see Section 15.1.3.4, "System variables
used with the binary log," and Section 5.1.6, "Server Status
Variables." (Bug #57275, Bug #11764443)

* Replication: The Binlog_cache_use and Binlog_cache_disk_use
status variables were incremented twice by a change to a table
using a transactional storage engine. (Bug #56343, Bug
#11763611)

* Replication: When STOP SLAVE is issued, the slave SQL thread
rolls back the current transaction and stops immediately if
the transaction updates only tables which use transactional
storage engines are updated. Previously, this occurred even
when the transaction contained CREATE TEMPORARY TABLE
statements, DROP TEMPORARY TABLE statements, or both, although
these statements cannot be rolled back. Because temporary
tables persist for the lifetime of a user session (in the
case, the replication user), they remain until the slave is
stopped or reset. When the transaction is restarted following
a subsequent START SLAVE statement, the SQL thread aborts with
an error that a temporary table to be created (or dropped)
already exists (or does not exist, in the latter case).
Following this fix, if an ongoing transaction contains CREATE
TEMPORARY TABLE statements, DROP TEMPORARY TABLE statements,
or both, the SQL thread now waits until the transaction ends,
then stops. (Bug #56118, Bug #11763416)

* Replication: When an error occurred in the generation of the
name for a new binary log file, the error was logged but not
shown to the user. (Bug #46166, Bug #11754544)
See also Bug #37148, Bug #11748696, Bug #40611, Bug #11750196,
Bug #43929, Bug# 11752675, Bug #51019, Bug #11758769.

* Replication: When lower_case_table_names was set to 1 on the
slave, but not on the master, names of databases in replicated
statements were not converted, causing replication to fail on
slaves using case-sensitive file systems. This occurred for
both statement-based and row-based replication.
In addition, when using row-based replication with
lower_case_table_names set to 1 on the slave only, names of
tables were also not converted, also causing replication
failure on slaves using case-sensitive file systems. (Bug
#37656)

* A Valgrind failure occurred in fn_format when called from
archive_discover. (Bug #58205, Bug #11765259)

* Passing a string that was not null-terminated to UpdateXML()
or ExtractValue() caused the server to fail with an assertion.
(Bug #57279, Bug #11764447)

* In bootstrap mode, the server could not execute statements
longer than 10,000 characters. (Bug #55817, Bug #11763139)

* NULL values were not grouped properly for some joins
containing GROUP BY. (Bug #45267, Bug #11753766)

* A HAVING clause could be lost if an index for ORDER BY was
available, incorrectly permitting additional rows to be
returned. (Bug #45227, Bug #11753730)

* The optimizer could underestimate the memory required for
column descriptors during join processing and cause memory
corruption or a server crash. (Bug #42744, Bug #11751763)

* The server returned incorrect results for WHERE ... OR ...
GROUP BY queries against InnoDB tables. (Bug #37977, Bug
#11749031)

* An incorrectly checked XOR subquery optimization resulted in
an assertion failure. (Bug #37899, Bug #11748998)

* A query that could use one index to produce the desired
ordering and another index for range access with index
condition pushdown could cause a server crash. (Bug #37851,
Bug #11748981)

* With index condition pushdown enabled, InnoDB could crash due
to a mismatch between what pushdown code expected to be in a
record versus what was actually there. (Bug #36981, Bug
#11748647)

* The range optimizer ignored conditions on inner tables in
semi-join IN subqueries, causing the optimizer to miss good
query execution plans. (Bug #35674, Bug #11748263)

* A server crash or memory overrun could occur with a dependent
subquery and joins. (Bug #34799, Bug #11748009)

* Selecting from a view that referenced the same table in the
FROM clause and an IN clause caused a server crash. (Bug
#33245)

* Deeply nested subqueries could cause stack overflow or a
server crash. (Bug #32680, Bug #11747503)

* The server crashed on optimization of queries that compared an
indexed DECIMAL column with a string value. (Bug #32262, Bug
#11747426)

* The server crashed on optimizations that used the range
checked for each record access method. (Bug #32229, Bug
#11747417)

* If the optimizer used a Multi-Range Read access method for
index lookups, incorrect results could occur for rows that
contained any of the BLOB or TEXT data types. (Bug #30622, Bug
#11747076)

* Compared to MySQL 5.1, the optimizer failed to use join
buffering for certain queries, resulting in slower performance
for those queries. (Bug #30363, Bug #11747028)

* For Multi-Range Read scans used to resolve LIMIT queries,
failure to close the scan caused file descriptor leaks for
MyISAM tables. (Bug #30221, Bug #11746994)

* SHOW CREATE DATABASE did not account for the value of the
lower_case_table_names system variable. (Bug #21317, Bug
#11745926)

* InnoDB Storage Engine: The server could crash on shutdown, if
started with --innodb-use-system-malloc=0. (Bug #55581, Bug
#11762927)

* Replication: The unused and deprecated server options
--init-rpl-role and --rpl-recovery-rank, as well as the unused
and deprecated status variable Rpl_status, have been removed.
(Bug #54649, Bug #11762095)
See also Bug #34437, Bug #11747900, Bug #34635, Bug #11747961.

* Replication: The flag stating whether a user value was signed
or unsigned (unsigned_flag) could sometimes change between the
time that the user value was recorded for logging purposes and
the time that the value was actually written to the binary
log, which could lead to inconsistency. Now unsigned_flag is
copied when the user variable value is copied, and the copy of
unsigned_flag is then used for logging. (Bug #51426, Bug
#11759138)
See also Bug #49562, Bug #11757508.

* The embedded server could crash when determining which
directories to search for option files. (Bug #55062, Bug
#11762465)

* Performance Schema code was subject to a buffer overflow. (Bug
#53363)

* On Windows, an IPv6 connection to the server could not be made
using an IPv4 address or host name. (Bug #52381, Bug
#11760016)

* Subquery execution for EXPLAIN could be done incorrectly and
raise an assertion. (Bug #52317, Bug #11759957)

* There was a mixup between GROUP BY and ORDER BY concerning
which indexes should be considered or permitted during query
optimization. (Bug #52081, Bug #11759746)

* On Windows, the my_rename() function failed to check whether
the source file existed. (Bug #51861, Bug #11759540)

* The ref column of EXPLAIN output for subquery lines could be
missing information. (Bug #50257, Bug #11758106)

* Passwords for CREATE USER statements were written to the
binary log in plaintext rather than in ciphertext. (Bug
#50172)

* The BLACKHOLE storage engine failed to load on Solaris and
OpenSolaris if DTrace probes had been enabled. (Bug #47748,
Bug #11755909)

* Some error messages included a literal mysql database name
rather than a parameter for the database name. (Bug #46792,
Bug #11755079)

* In the ER_TABLEACCESS_DENIED_ERROR error message, the command
name parameter could be truncated. (Bug #45355, Bug #11753840)

* On Windows, mysqlslap crashed for attempts to connect using
shared memory. (Bug #31173, Bug #11747181)

* To forestall the occurrence of possible relocation errors in
the future, libmysys, libmystrings, and libdbug have been
changed from normal libraries to "noinst" libtool helper
libraries, and are no longer installed as separate libraries.
(Bug #29791, Bug #11746931)

* A suboptimal query execution plan could be chosen when there
were several possible range and ref accesses. Now preference
is given to the keys that match the most parts and choosing
the best one among them. (Bug #26106, Bug #11746406)

* Searches for data on a partial index for a column using the
UTF8 character set would fail. (Bug #24858)

* For queries with GROUP BY, FORCE INDEX was not ignored as it
should have been when it would result in a more expensive
query execution plan. (Bug #18144, Bug #11745649)

Hery Ramilison
MySQL/ORACLE Release Engineering Team




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