MySQL now can do stack dumps on x86_64 and i386/NPTL systems. (Bug#21250)

The mysqld and mysqlmanager manpages have been reclassified from volume 1 to volume 8. (Bug#21220)

InnoDB now honors IGNORE INDEX. Perviously using IGNORE INDEX in cases where an index sort would be slower than a filesort had no effect when used with InnoDB tables.

(Bug#21174)

TIMESTAMP columns that are NOT NULL now are reported that way by SHOW COLUMNS and INFORMATION_SCHEMA. (Bug#20910)

The MySQL distribution now compiles on UnixWare 7.13. (Bug#20190)

configure now defines the symbol DBUG_ON in config.h to indicate whether the source tree is configured to be compiled with debugging support. (Bug#19517)

mysql_upgrade no longer reads the [client] option file group because it is not a client and did not understand client options such as host. Now it reads only the [mysql_upgrade] group. (Bug#19452)

For mysqlshow, if a database name argument contains wildcard characters (such as “ _ ”) but matches a single database name exactly, treat the name as a literal name. This allows a command such as mysqlshow information_schema work without having to escape the wildcard character. (Bug#19147)

On Windows, typing Control-C while a query was running caused the mysql client to crash. Now it causes mysql to attempt to kill the current statement. If this cannot be done, or Control-C is typed again before the statement is killed, mysql exits. (In other words, mysql's behavior with regard to Control-C is now the same as it is on Unix platforms.) (Bug#17926)

See also Bug#1989

The VIEW_DEFINITION column of the INFORMATION_SCHEMA VIEWS table now contains information about the view algorithm. (Bug#16832)

The bundled yaSSL library licensing has added a FLOSS exception similar to MySQL to resolve licensing incompatibilities with MySQL. (See the extra/yassl/FLOSS-EXCEPTIONS file in a MySQL source distribution for details.) (Bug#16755)

Table comments longer than 60 characters and column comments longer than 255 characters were truncated silently. Now a warning is issued, or an error in strict mode. (Bug#13934)

The mysql client used the default character set if it automatically reconnected to the server, which is incorrect if the character set had been changed. To enable the character set to remain synchronized on the client and server, the mysql command charset (or \C) that changes the default character set and now also issues a SET NAMES statement. The changed character set is used for reconnects. (Bug#11972)

If a DROP VIEW statement named multiple views, it stopped with an error if a non-existent view was named and did not drop the remaining views. Now it continues on and reports an error at the end, similar to DROP TABLE. (Bug#11551)

The server now issues a warning if it removes leading spaces from an alias. (Bug#10977)

For a successful dump, mysqldump now writes a SQL comment to the end of the dump file in the following format:

-- Dump completed on YYYY-MM-DD hh:mm:ss

(Bug#10877)

For spatial data types, the server formerly returned these as VARSTRING values with a binary collation. Now the server returns spatial values as BLOB values. (Bug#10166)

A new system variable, lc_time_names, specifies the locale that controls the language used to display day and month names and abbreviations. This variable affects the output from the DATE_FORMAT(), DAYNAME() and MONTHNAME() functions. See Section 9.7, “MySQL Server Locale Support”.

Using --with-debug to configure MySQL with debugging support enables you to use the --debug="d,parser_debug" option when you start the server. This causes the Bison parser that is used to process SQL statements to dump a parser trace to the server's standard error output. Typically, this output is written to the error log.

The bundled yaSSL library was upgraded to version 1.3.7.

Security Fix: A stored routine created by one user and then made accessible to a different user using GRANT EXECUTE could be executed by that user with the privileges of the routine's definer. (Bug#18630, CVE-2006-4227)

Security Fix: On Linux, and possibly other platforms using case-sensitive filesystems, it was possible for a user granted rights on a database to create or access a database whose name differed only from that of the first by the case of one or more letters. (Bug#17647, CVE-2006-4226)

MySQL Cluster: Packaging: The ndb_mgm program was included in both the MySQL-ndb-tools and MySQL-ndb-management RPM packages, resulting in a conflict if both were installed. Now ndb_mgm is included only in MySQL-ndb-tools. (Bug#21058)

MySQL Cluster: Setting TransactionDeadlockDetectionTimeout to a value greater than 12000 would cause scans to deadlock, time out, fail to release scan records, until the cluster ran out of scan records and stopped processing. (Bug#21800)

MySQL Cluster: A memory leak occurred when running ndb_mgm -e "SHOW". (Bug#21670)

MySQL Cluster: The server provided a non-descriptive error message when encountering a fatally corrupted REDO log. (Bug#21615)

MySQL Cluster: A partial rollback could lead to node restart failures. (Bug#21536)

MySQL Cluster: The failure of a unique index read due to an invalid schema version could be handled incorrectly in some cases, leading to unpredictable results. (Bug#21384)

MySQL Cluster: In a cluster with more than 2 replicas, a manual restart of one of the data nodes could fail and cause the other nodes in the same node group to shut down. (Bug#21213)

MySQL Cluster: Some queries involving joins on very large NDB tables could crash the MySQL server. (Bug#21059)

MySQL Cluster: Restarting a data node while DDL operations were in progress on the cluster could cause other data nodes to fail. This could also lead to mysqld hanging or crashing under some circumstances. (Bug#21017, Bug#21050)

MySQL Cluster: In some situations with a high disk-load, writing of the redo log could hang, causing a crash with the error message GCP STOP detected. (Bug#20904)

MySQL Cluster: When the redo buffer ran out of space, a Pointer too large error was raised and the cluster could become unusable until restarted with --initial. (Bug#20892)

MySQL Cluster: A vague error message was returned when reading both schema files during a restart of the cluster. (Bug#20860)

MySQL Cluster: Incorrect values were inserted into AUTO_INCREMENT columns of tables restored from a cluster backup. (Bug#20820)

MySQL Cluster: When attempting to restart the cluster following a data import, the cluster failed during Phase 4 of the restart with Error 2334: Job buffer congestion. (Bug#20774)

MySQL Cluster: REPLACE statements did not work correctly on an NDB table having both a primary key and a unique key. In such cases, proper values were not set for columns which were not explicitly referenced in the statement. (Bug#20728)

MySQL Cluster: The server did not honor the value set for ndb_cache_check_time in the my.cnf file. (Bug#20708)

MySQL Cluster: ndb_size.pl and ndb_error_reporter were missing from RPM packages. (Bug#20426)

MySQL Cluster: Running ndbd --nowait-nodes=id where id was the node ID of a node that was already running would fail with an invalid error message. (Bug#20419)

MySQL Cluster: (Direct APIs): NdbScanOperation::readTuples() and NdbIndexScanOperation::readTuples() ignored the batch parameter. (Bug#20252)

MySQL Cluster: A node failure during a scan could sometime cause the node to crash when restarting too quickly following the failure. (Bug#20197)

MySQL Cluster: It was possible to use port numbers greater than 65535 for ServerPort in the config.ini file. (Bug#19164)

MySQL Cluster: Under certain circumstances, a node that was shut down then restarted could hang during the restart. (Bug#18863)

MySQL Cluster: Trying to create or drop a table while a node was restarting caused the node to crash. This is now handled by raising an error. (Bug#18781)

MySQL Cluster: The server failed with a non-descriptive error message when out of data memory. (Bug#18475)

MySQL Cluster: For NDB and possibly InnoDB tables, a BEFORE UPDATE trigger could insert incorrect values. (Bug#18437)

MySQL Cluster: SELECT ... FOR UPDATE failed to lock the selected rows. (Bug#18184)

MySQL Cluster: perror did not properly report NDB error codes. (Bug#16561)

MySQL Cluster: A Cluster whose storage nodes were installed from the MySQL-ndb-storage-* RPMs could not perform CREATE or ALTER operations that made use of non-default character sets or collations. (Bug#14918)

MySQL Cluster: The management client ALL STATUS command could sometimes report the status of some data nodes incorrectly. (Bug#13985)

MySQL Cluster: An issue that arose from a patch for Bug#19852 made in MySQL 5.0.23 was corrected. (See Section E.1.6, “Changes in MySQL 5.0.23 (Not released)”.)

Cluster Replication: In some cases, a large number of MySQL servers sending requests to the cluster simultaneously could cause the cluster to crash. This could also be triggered by many NDB API clients making simultaneous event subscriptions or unsubscriptions. (Bug#20683)

Cluster API: Invoking the MGM API function ndb_mgm_listen_event() caused a memory leak. (Bug#21671)

Cluster API: The MGM API function ndb_logevent_get_fd() was not implemented. (Bug#21129)

Some Linux-x86_64-icc packages (of previous releases) mistakenly contained 32-bit binaries. Only ICC builds are affected, not gcc builds. Solaris and FreeBSD x86_64 builds are not affected. (Bug#22238)

Running SHOW MASTER LOGS at the same time as binary log files were being switched would cause mysqld to hang. (Bug#21965)

libmysqlclient defined a symbol BN_bin2bn which belongs to OpenSSL. This could break applications that also linked against OpenSSL's libcrypto library. The fix required correcting an error in a build script that was failing to add rename macros for some functions. (Bug#21930)

character_set_results can be NULL to signify “no conversion,” but some code did not check for NULL, resulting in a server crash. (Bug#21913)

A NUL byte within a prepared statement string caused the rest of the string not to be written to the query log, allowing logging to be bypassed. (Bug#21813)

COUNT(*) queries with ORDER BY and LIMIT could return the wrong result.

(Bug#21787)

INSERT ... SELECT sometimes generated a spurious Column count doesn't match value count error. (Bug#21774)

EXPORT_SET() did not accept arguments with coercible character sets. (Bug#21531)

mysqldump incorrectly tried to use LOCK TABLES for tables in the INFORMATION_SCHEMA database. (Bug#21527)

Memory overruns could occur for certain kinds of subqueries. (Bug#21477)

A DATE can be represented as an integer (such as 20060101) or as a string (such as '2006.01.01'). When a DATE (or TIME) column is compared in one SELECT against both representations, constant propagation by the optimizer led to comparison of DATE as a string against DATE as an integer. This could result in integer comparisons such as 2006 against 20060101, erroneously producing a false result. (Bug#21475)

Adding ORDER BY to a SELECT DISTINCT(expr) query could produce incorrect results. (Bug#21456)

Database and table names have a maximum length of 64 characters (even if they contain multi-byte characters), but were truncated to 64 bytes.

(Bug#21432)

With max_sp_recursion set to 0, a stored procedure that executed a SHOW CREATE PROCEDURE statement for itself triggered a recursion limit exceeded error, though the statement involves no recursion. (Bug#21416)

On 64-bit Windows, a missing table generated error 1017, not the correct value of 1146. (Bug#21396)

The optimizer sometimes produced an incorrect row-count estimate after elimination of const tables. This resulted in choosing extremely inefficient execution plans in same cases when distribution of data in joins were skewed. (Bug#21390)

A query result could be sorted improperly when using ORDER BY for the second table in a join. (Bug#21302)

Query results could be incorrect if the WHERE clause contained t.key_part NOT IN (val_list), where val_list is a list of more than 1000 constants. (Bug#21282)

For user-defined functions created with CREATE FUNCTION, the DEFINER clause is not legal, but no error was generated. (Bug#21269)

The SELECT privilege was required for an insert on a view, instead of the INSERT privilege. (Bug#21261)

This regression was introduced by Bug#20989

Subqueries on INFORMATION_SCHEMA tables could erroneously return an empty result. (Bug#21231)

mysql_upgrade created temporary files in a possibly insecure way. (Bug#21224)

When DROP DATABASE or SHOW OPEN TABLES was issued while concurrently in another connection issuing DROP TABLE, RENAME TABLE, CREATE TABLE LIKE or any other statement that required a name lock, the server crashed. (Bug#21216, Bug#19403)

The --master-data option for mysqldump requires certain privileges, but mysqldump generated a truncated dump file without producing an appropriate error message or exit status if the invoking user did not have those privileges. (Bug#21215)

Some prepared statements caused a server crash when executed a second time. (Bug#21166)

The optimizer assumed that if (a=x AND b=x) is true, (a=x AND b=x) AND a=b is also true. But that is not always so if a and b have different data types. (Bug#21159)

SHOW INNODB STATUS contained some duplicate output. (Bug#21113)

InnoDB was slow with more than 100,000 .idb files. (Bug#21112)

Performing an INSERT on a view that was defined using a SELECT that specified a collation and a column alias caused the server to crash . (Bug#21086)

ALTER VIEW did not retain existing values of attributes that had been originally specified but were not changed in the ALTER VIEW statement. (Bug#21080)

For InnoDB tables, the server could crash when executing NOT IN(...) subqueries. (Bug#21077)

The myisam_stats_method variable was mishandled when set from an option file or on the command line. (Bug#21054)

With query_cache_type set to 0, RESET QUERY CACHE was very slow and other threads were blocked during the operation. Now a cache reset is faster and non-blocking. (Bug#21051)

mysql crashed for very long arguments to the connect command. (Bug#21042)

A query using WHERE column = constant OR column IS NULL did not return consistent results on successive invocations. The column in each part of the WHERE clause could be either the same column, or two different columns, for the effect to be observed. (Bug#21019)

Performance during an import on a table with a trigger that called a stored procedure was severely degraded. This issue first arose in MySQL 5.0.18. (Bug#21013)

A query of the form shown here caused the server to crash:

SELECT * FROM t1 NATURAL JOIN (
    t2 JOIN (
        t3 NATURAL JOIN t4,
        t5 NATURAL JOIN t6
    )
    ON (t3.id3 = t2.id3 AND t5.id5 = t2.id5)
);

(Bug#21007)

STR_TO_DATE() sometimes would return NULL if the %D format specifier was not the last specifier in the format string. (Bug#20987)

A query using WHERE NOT (column < ANY (subquery)) yielded a different result from the same query using the same column and subquery with WHERE (column > ANY (subquery)). (Bug#20975)

In debugging mode, mysqld printed server_init rather than network_init during network initialization. (Bug#20968)

Under certain circumstances, AVG(key_val) returned a value but MAX(key_val) returned an empty set due to incorrect application of MIN()/MAX() optimization. (Bug#20954)

On Windows, mysql_upgrade.exe could not find mysqlcheck.exe. (Bug#20950)

Use of zero-length variable names caused a server crash. (Bug#20908)

The server crashed when using the range access method to execut a subquery with a ORDER BY DESC clause. (Bug#20869)

For certain queries, the server incorrectly resolved a reference to an aggregate function and crashed. (Bug#20868)

Using aggregate functions in subqueries yielded incorrect results under certain circumstances due to incorrect application of MIN()/MAX() optimization. (Bug#20792)

If a column definition contained a character set declaration, but a DEFAULT value began with an introducer, the introducer character set was used as the column character set. (Bug#20695)

Multiplication of DECIMAL values could produce incorrect fractional part and trailing garbage caused by signed overflow. (Bug#20569)

Users who had the SHOW VIEW privilege for a view and privileges on one of the view's base tables could not see records in INFORMATION_SCHEMA tables relating to the base table. (Bug#20543)

The MD5(), SHA1(), and ENCRYPT() functions should return a binary string, but the result sometimes was converted to the character set of the argument. MAKE_SET() and EXPORT_SET() now use the correct character set for their default separators, resulting in consistent result strings which can be coerced according to normal character set rules. (Bug#20536)

A subquery that contained LIMIT N,1 could return more than one row. (Bug#20519)

Creation of a view as a join of views or tables could fail if the views or tables are in different databases. (Bug#20482)

SELECT statements using GROUP BY against a view could have missing columns in the output when there was a trigger defined on one of the base tables for the view. (Bug#20466)

CREATE PROCEDURE, CREATE FUNTION, CREATE TRIGGER, and CREATE VIEW statements containing multi-line comments (/* ... */) could not be replicated. (Bug#20438)

For connections that required a SUBJECT value, a check was performed to verify that the value was correct, but the connection was not refused if not. (Bug#20411)

Some user-level errors were being written to the server's error log, which is for server errors. (Bug#20402)

perror crashed on Solaris due to NULL return value of strerror() system call. (Bug#20145)

For mysql, escaping with backslash sometimes did not work. (Bug#20103)

Use of MIN() or MAX() with GROUP BY on a ucs2 column could cause a server crash. (Bug#20076)

mysqld --flush failed to flush MyISAM table changes to disk following an UPDATE statement for which no updated column had an index. (Bug#20060)

A user-defined function that is called on each row of a returned result set, could receive an in_null state that is set, if it was set previously. Now, the is_null state is reset to false before each invocation of a UDF. (Bug#19904)

The query command for mysqltest did not work. (Bug#19890)

When executing a SELECT with ORDER BY on a view that is constructed from a SELECT statement containing a stored function, the stored function was evaluated too many times. (Bug#19862)

The first time a user who had been granted the CREATE ROUTINE privilege used that privilege to create a stored function or procedure, the Password column in that user's row in the mysql.user table was set to NULL. (Bug#19857)

For TIME_FORMAT(), the %H and %k format specifiers can return values larger than two digits (if the hour is greater than 99), but for some query results that contained three-character hours, column values were truncated. (Bug#19844)

Using SELECT on a corrupt MyISAM table using the dynamic record format could cause a server crash. (Bug#19835)

Using cursors with READ COMMITTED isolation level could cause InnoDB to crash. (Bug#19834)

The yaSSL library bundled with libmysqlclient had some conflicts with OpenSSL. Now macros are used to rename the conflicting symbols to have a prefix of ya. (Bug#19810)

On 64-bit systems, use of the cp1250 character set with a primary key column in a LIKE clause caused a server crash for patterns having letters in the range 128..255. (Bug#19741)

DESCRIBE returned the type BIGINT for a column of a view if the column was specified by an expression over values of the type INT. (Bug#19714)

An issue with yaSSL prevented Connector/J clients from connecting to the server using a certificate. (Bug#19705)

A cast problem caused incorrect results for prepared statements that returned float values when MySQL was compiled with gcc 4.0. (Bug#19694)

The mysql_list_fields() C API function returned the incorrect table name for views. (Bug#19671)

If a query had a condition of the form tableX.key = tableY.key , which participated in equality propagation and also was used for ref access, then early ref-access NULL filtering was not peformed for the condition. This could make query execution slower. (Bug#19649)

Repeated DROP TABLE statements in a stored procedure could sometimes cause the server to crash. (Bug#19399)

When not running in strict mode, the server failed to convert the invalid years portion of a DATE or DATETIME value to '0000' when inserting it into a table.

(Bug#19370)

See also Bug#25301

The final parenthesis of a CREATE INDEX statement occurring in a stored procedure was omitted from the binary log when the stored procedure was called. (Bug#19207)

A SELECT with a subquery that was bound to the outer query over multiple columns returned different results when a constant was used instead of one of the dependant columns. (Bug#18925)

Setting myisam_repair_threads caused any repair operation on a MyISAM table to fail to update the cardinality of indexes, instead making them always equal to 1. (Bug#18874)

FEDERATED tables raised invalid duplicate key errors when attempting on one server to insert rows having the same primary key values as rows that had been deleted from the linked table on the other server. (Bug#18764)

The implementation for UNCOMPRESS() did not indicate that it could return NULL, causing the optimizer to do the wrong thing. (Bug#18539)

Using > ALL with subqueries that return no rows yielded incorrect results under certain circumstances due to incorrect application of MIN()/MAX() optimization. (Bug#18503)

Referring to a stored function qualified with the name of one database and tables in another database caused a “table doesn't exist” error. (Bug#18444)

Triggers on tables in the mysql database caused a server crash. Triggers for tables in this database now are disallowed. (Bug#18361, Bug#18005)

The length of the pattern string prefix for LIKE operations was calculated incorrectly for multi-byte character sets. As a result, the scanned range was wider than necessary if the prefix contained any multi-byte characters, and rows could be missing from the result set. (Bug#18359, Bug#16674)

Multiple invocations of the REVERSE() function could return different results. (Bug#18243)

The optimizer did not take advantage of indexes on columns used for the second or third arguments of BETWEEN. (Bug#18165)

For table-format output, mysql did not always calculate columns widths correctly for columns containing multi-byte characters in the column name or contents. (Bug#17939)

The character set was not being properly initialized for CAST() with a type like CHAR(2) BINARY, which resulted in incorrect results or even a server crash. (Bug#17903)

Checking a MyISAM table (using CHECK TABLE) having a spatial index and only one row would wrongly indicate that the table was corrupted. (Bug#17877)

A stored procedure that created and invoked a prepared statement was not executed when called in a mysqld init-file. (Bug#17843)

It is possible to create MERGE tables into which data cannot be inserted (by not specifying a UNION clause. However, when an insert was attempted, the error message was confusing. Now an error occurs indicating that the table is read-only. (Bug#17766)

Attempting to insert a string of greater than 4096 bytes into a FEDERATED table resulted in the error ERROR 1296 (HY000) at line 2: Got error 10000 'Error on remote system: 1054: Unknown column 'string-value' from FEDERATED. This error was raised regardless of the type of column involved (VARCHAR, TEXT, and so on.) (Bug#17608)

Views could not be updated within a stored function or trigger. (Bug#17591)

Use of the --prompt option or prompt command caused mysql to be unable to connect to the Instance Manager. (Bug#17485)

N'xxx' and _utf8'xxx' were not treated as equivalent because N'xxx' failed to unescape backslashes (\) and doubled apostrophe/single quote characters (''). (Bug#17313)

Use of the join cache in favor of an index for ORDER BY operations could cause incorrect result sorting. (Bug#17212)

The PASSWORD() function returned invalid results when used in some UNION queries. (Bug#16881)

ORDER BY RAND() LIMIT 1 always set a user variable to the last possible value from the table. (Bug#16861)

When performing a GROUP_CONCAT(), the server transformed BLOB columns VARCHAR columns, which could cause erroneous results when using Connector/J and possibly other MySQL APIs. (Bug#16712)

Stored procedures did not use the character set defined for the database in which they were created. (Bug#16676)

Some server errors were not reported to the client, causing both to try to read from the connection until a hang or crash resulted. (Bug#16581)

On Windows, a definition for mysql_set_server_option() was missing from the C client library. (Bug#16513)

Updating a column of a FEDERATED table to NULL sometimes failed. (Bug#16494)

For SELECT ... FOR UPDATE statements that used DISTINCT or GROUP BY over all key parts of a unique index (or primary key), the optimizer unnecessarily created a temporary table, thus losing the linkage to the underlying unique index values. This caused a Result set not updatable error. (The temporary table is unnecessary because under these circumstances the distinct or grouped columns must also be unique.) (Bug#16458)

Using ANY with “non-table” subqueries such as SELECT 1 yielded incorrect results under certain circumstances due to incorrect application of MIN()/MAX() optimization. (Bug#16302)

A subquery in the WHERE clause of the outer query and using IN and GROUP BY returned an incorrect result. (Bug#16255)

A query could produce different results with and without and index, if the WHERE clause contained a range condition that used an invalid DATETIME constant. (Bug#16249)

TIMESTAMPDIFF() examined only the date and ignored the time when the requested difference unit was months or quarters. (Bug#16226)

Using tables from MySQL 4.x in MySQL 5.x, in particular those with VARCHAR fields and using INSERT DELAYED to update data in the table would result in either data corruption or a server crash. (Bug#16218, Bug#17294, Bug#16611)

The value returned by a stored function returning a string value was not of the declared character set. (Bug#16211)

The index_merge/Intersection optimizer could experience a memory overrun when the number of table columns covered by an index was sufficiently large, possibly resulting in a server crash. (Bug#16201)

DECIMAL columns were handled incorrectly in two respects :

(Bug#16172)

Certain queries having a WHERE clause that included conditions on multi-part keys with more than 2 key parts could produce incorrect results and send [Note] Use_count: Wrong count for key at... messages to STDERR. (Bug#16168)

When a row was inserted through a view but did not specify a value for a column that had no default value in the base table, no warning or error occurred. Now a warning occurs, or an error in strict SQL mode. (Bug#16110)

When NOW() was used in a BETWEEN clause of the definition for a view, it was replaced with a constant in the view. (Bug#15950)

The C API failed to return a status message when invoking a stored procedure. (Bug#15752)

mysqlimport sends a set @@character_set_database=binary statement to the server, but this is not understood by pre-4.1 servers. Now mysqlimport encloses the statement within a /*!40101 ... */ comment so that old servers will ignore it. (Bug#15690)

For the CSV storage engine, memory-mapped pages of the data file were not invalidated when new data was appended to the file via traditional (file descriptor-based) I/O primitives. (Bug#15669)

SHOW GRANTS FOR CURRENT_USER did not return definer grants when executed in DEFINER context (such as within a stored prodedure defined with SQL SECURITY DEFINER), it returned the invoker grants. (Bug#15298)

The --collation-server server option was being ignored. With the fix for this problem, if you choose a non-default character set with --character-set-server, you should also use --collation-server to specify the collation. (Bug#15276)

The server crashed if it tried to access a CSV table for which the data file had been removed. (Bug#15205)

Tables created with the FEDERATED storage engine did not permit indexes using NULL columns. (Bug#15133)

When using tables containing VARCHAR columns created under MySQL 4.1 with a 5.0 or later server, for some queries the metadata sent to the client could have an empty column name. (Bug#14897)

CREATE TABLE ... SELECT statements that selected GEOMETRY values resulted in a table that contained BLOB columns, not GEOMETRY columns. (Bug#14807)

When setting a column to its implicit default value as the result of inserting a NULL into a NOT NULL column as part of a multi-row insert or LOAD DATA operation, the server returned a misleading warning message. (Bug#14770)

The use of WHERE col_name IS NULL in SELECT statements reset the value of LAST_INSERT_ID() to zero. (Bug#14553)

Inserts into BIT columns of FEDERATED tables did not work. (Bug#14532)

Using SELECT and a table join while running a concurrent INSERT operation would join incorrect rows. (Bug#14400)

Prepared statements caused general log and server memory corruption. (Bug#14346)

libmysqld produced some warnings to stderr which could not be silenced. These warnings now are suppressed. (Bug#13717)

The Instance Manager allowed STOP INSTANCE to be used on a server instance that was not running. (Bug#12673)

For very complex SELECT statements could create temporary tables that were too large, and for which the temporary files were not removed, causing subsequent queries to fail. (Bug#11824)

USE did not refresh database privileges when employed to re-select the current database. (Bug#10979)

The type of the value returned by the VARIANCE() function varied according to the type of the input value. The function should always return a DOUBLE value. (Bug#10966)

The same trigger error message was produced under two conditions: The trigger duplicated an existing trigger name, or the trigger duplicated an existing combination of action and event. Now different messages are produced for the two conditions so as to be more informative. (Bug#10946)

CREATE USER did not respect the 16-character username limit. (Bug#10668)

A server or network failure with an open client connection would cause the client to hang even though the server was no longer available.

As a result of this change, the MYSQL_OPT_READ_TIMEOUT and MYSQL_OPT_WRITE_TIMEOUT options for mysql_options() now apply to TCP/IP connections on all platforms. Previously, they applied only to Windows. (Bug#9678)

INSERT INTO ... SELECT ... LIMIT 1 could be slow because the LIMIT was ignored when selecting candidate rows. (Bug#9676)

The optimizer could produce an incorrect result after AND with collations such as latin1_german2_ci, utf8_czech_ci, and utf8_lithianian_ci. (Bug#9509)

A stored procedure with a CONTINUE handler that encountered an error continued to execute a statement that caused an error, rather with the next statement following the one that caused the error. (Bug#8153)

For ODBC compatibility, MySQL supports use of WHERE col_name IS NULL for DATE or DATETIME columns that are NOT NULL, to allow column values of '0000-00-00' or '0000-00-00 00:00:00' to be selected. However, this was not working for WHERE clauses in DELETE statements. (Bug#8143)

A user variable set to a value selected from an unsigned column was stored as a signed value. (Bug#7498)

The --with-collation option was not honored for client connections. (Bug#7192)

When the precision of the column was too small for the value. In this case, the original value was returned instead of an error.

When the scale of the column was set to 0. In this case, the value. In this case, the value was treated as though the scale had been defined as 2.