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From:Hery Ramilison Date:April 11 2011 1:41pm
Subject:MySQL Community Server 5.6.2 has been released (part 2 - bug fixes)
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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



Thread
MySQL Community Server 5.6.2 has been released (part 2 - bug fixes)Hery Ramilison11 Apr