MySQL

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MySQL 5.1.51




# Bugs fixed:

* Incompatible Change: Replication: As of MySQL 5.5.6, handling of CREATE TABLE IF NOT EXISTS ... SELECT statements has been changed for the case that the destination table already exists:
- Previously, for CREATE TABLE IF NOT EXISTS ... SELECT, MySQL produced a warning that the table exists, but inserted the rows and wrote the statement to the binary log anyway. By contrast, CREATE TABLE ... SELECT (without IF NOT EXISTS) failed with an error, but MySQL inserted no rows and did not write the statement to the binary log.
- MySQL now handles both statements the same way when the destination table exists, in that neither statement inserts rows or is written to the binary log. The difference between them is that MySQL produces a warning when IF NOT EXISTS is present and an error when it is not.
- This change in handling of IF NOT EXISTS results in an incompatibility for statement-based replication from a MySQL 5.1 master with the original behavior and a MySQL 5.5 slave with the new behavior. Suppose that CREATE TABLE IF NOT EXISTS ... SELECT is executed on the master and the destination table exists. The result is that rows are inserted on the master but not on the slave. (Row-based replication does not have this problem.)
- To address this issue, statement-based binary logging for CREATE TABLE IF NOT EXISTS ... SELECT is changed in MySQL 5.1 as of 5.1.51:
- If the destination table does not exist, there is no change: The statement is logged as is.
- If the destination table does exist, the statement is logged as the equivalent pair of CREATE TABLE IF NOT EXISTS and INSERT ... SELECT statements. (If the SELECT in the original statement is preceded by IGNORE or REPLACE, the INSERT becomes INSERT IGNORE or REPLACE, respectively.)
- This change provides forward compatibility for statement-based replication from MySQL 5.1 to 5.5 because when the destination table exists, the rows will be inserted on both the master and slave. To take advantage of this compatibility measure, the 5.1 server must be at least 5.1.51 and the 5.5 server must be at least 5.5.6.To upgrade an existing 5.1-to-5.5 replication scenario, upgrade the master first to 5.1.51 or higher. Note that this differs from the usual replication upgrade advice of upgrading the slave first.A workaround for applications that wish to achieve the original effect (rows inserted regardless of whether the destination table exists) is to use CREATE TABLE IF NOT EXISTS and INSERT ... SELECT statements rather than CREATE TABLE IF NOT EXISTS ... SELECT statements.Along with the change just described, the following related change was made: Previously, if an existing view was named as the destination table for CREATE TABLE IF NOT EXISTS ... SELECT, rows were inserted into the underlying base table and the statement was written to the binary log. As of MySQL 5.1.51 and 5.5.6, nothing is inserted or logged. (Bug#47442, Bug#47132, Bug#48814, Bug#49494)
* Incompatible Change: Previously, if you flushed the logs using FLUSH LOGS or mysqladmin flush-logs and mysqld was writing the error log to a file (for example, if it was started with the --log-error option), it renamed the current log file with the suffix -old, then created a new empty log file. This had the problem that a second log-flushing operation thus caused the original error log file to be lost unless you saved it under a different name. For example, you could use the following commands to save the file: shell> mysqladmin flush-logs shell> mv host_name.err-old backup-directory To avoid the preceding file-loss problem, renaming no longer occurs. The server merely closes and reopens the log file. To rename the file, you can do so manually before flushing. Then flushing the logs reopens a new file with the original file name. For example, you can rename the file and create a new one using the following commands: shell> mv host_name.err host_name.err-old shell> mysqladmin flush-logs shell> mv host_name.err-old backup-directory (Bug#29751)
* Partitioning: When the storage engine used to create a partitioned table was disabled, attempting to drop the table caused the server to crash. (Bug#46086)
* If a view was named as the destination table for CREATE TABLE ... SELECT, the server produced a warning whether or not IF NOT EXISTS was used. Now it produces a warning only when IF NOT EXISTS is used, and an error otherwise. (Bug#55777)
* The CHECK TABLE command could cause a time-consuming verification of the InnoDB adaptive hash index memory structure. Now this extra checking is only performed in binaries built for debugging. (Bug#55716)
* After the fix for Bug#39653, the shortest available secondary index was used for full table scans. The primary clustered key was used only if no secondary index could be used. However, when the chosen secondary index includes all columns of the table being scanned, it is better to use the primary index because the amount of data to scan is the same but the primary index is clustered. This is now taken into account. (Bug#55656)
* (Bug#55627)
* The server was not checking for errors generated during the execution of Item::val_xxx() methods when copying data to a group, order, or distinct temp table's row. (Bug#55580)
* ORDER BY clauses that included user variable expressions could cause a debug assertion to be raised. (Bug#55565)
* Queries involving predicates of the form const NOT BETWEEN not_indexed_column AND indexed_column could return incorrect data due to incorrect handling by the range optimizer. (Bug#54802)
* MIN() or MAX() with a subquery argument could raise a debug assertion for debug builds or return incorrect data for nondebug builds. (Bug#54465)
* INFORMATION_SCHEMA plugins with no deinit() method resulted in a memory leak. (Bug#54253)
* INSERT IGNORE INTO ... SELECT statements could cause a debug assertion to be raised. (Bug#54106)
* The fix for Bug#30234 caused the server to reject the DELETE tbl_name.* ... Access compatibility syntax for multiple-table DELETE statements. (Bug#53034)
* Enumeration plugin variables were subject to a type casting error, causing inconsistent results between different platforms. (Bug#42144)
* A PKG install on Solaris put some files in incorrect locations. (Bug#31058)






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MySQL 5.1.52



# Bugs fixed:
- InnoDB Storage Engine: InnoDB incorrectly reported an error when a cascading foreign key constraint deleted more than 250 rows.
- InnoDB Storage Engine: A SELECT ... FOR UPDATE statement affecting a range of rows in an InnoDB table could cause a crash in the debug version of the server.
- InnoDB Storage Engine: Improved the performance of UPDATE operations on InnoDB tables, when only non-indexed columns are changed.
- InnoDB Storage Engine: The server could crash on shutdown, if started with --innodb-use-system-malloc=0.
- InnoDB Storage Engine: Setting the PACK_KEYS=0 table option for an InnoDB table prevented new indexes from being added to the table.
- InnoDB Storage Engine: Changed the locking mechanism for the InnoDB data dictionary during ROLLBACK operations, to improve concurrency for REPLACE statements.
- InnoDB Storage Engine: InnoDB transactions could be incorrectly committed during recovery, rather than rolled back, if the server crashed and was restarted after performing ALTER TABLE...ADD PRIMARY KEY on an InnoDB table, or some other operation that involves copying the entire table.
- Partitioning: Replication: Attempting to execute LOAD DATA on a partitioned MyISAM table while using statement-based logging mode caused the master to hang or crash.
- Partitioning: Multi-table UPDATE statements involving a partitioned MyISAM table could cause this table to become corrupted. Not all tables affected by the UPDATE needed to be partitioned for this issue to be observed.
- Partitioning: EXPLAIN PARTITIONS returned bad estimates for range queries on partitioned MyISAM tables. In addition, values in the rows column of EXPLAIN PARTITIONS output did not take partition pruning into account.
- Replication: Backticks used to enclose idenitfiers for savepoints were not preserved in the binary log, which could lead to replication failure when the identifier, stripped of backticks, could be misinterpreted, causing a syntax or other error.
* If a query specified a DATE or DATETIME value in a format different from 'YYYY-MM-DD HH:MM:SS', a greater-than-or-equal (>=) condition matched only greater-than values in an indexed TIMESTAMP column.
* If there was an active SELECT statement, an error arising during trigger execution could cause a server crash.
* With an UPDATE IGNORE statement including a subquery that was evaluated using a temporary table, an error transferring the data from the temporary was ignored, causing an assertion to be raised.
* Row subqueries producing no rows were not handled as UNKNOWN values in row comparison expressions.
* The max_length metadata value of MEDIUMBLOB types was reported as 1 byte greater than the correct value.
* In some cases, when the left part of a NOT IN subquery predicate was a row and contained NULL values, the query result was incorrect.
* For some queries, the optimizer produced incorrect results using the Index Merge access method with InnoDB tables.
- EXPLAIN produced an incorrect rows value for queries evaluated using an index scan and that included LIMIT, GROUP BY, and ORDER BY on a computed column.
- mysql_store_result() and mysql_use_result() are not for use with prepared statements and are not intended to be called following mysql_stmt_execute(), but failed to return an error when invoked that way.
* A malformed packet sent by the server when the query cache was in use resulted in lost-connection errors.
- CREATE TABLE failed if a column referred to in an index definition and foreign key definition was in different lettercases in the two definitions.






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MySQL 5.1.53




# Bugs fixed:
- Replication: SET PASSWORD caused row-based replication to fail between a MySQL 5.1 master and a MySQL 5.5 slave.
* This fix makes it possible to replicate SET PASSWORD correctly, using row-based replication between a master running MySQL 5.1.53 or a later MySQL 5.1 release to a slave running MySQL 5.5.7 or a later MySQL 5.5 release.
- Replication: An ALTER TABLE statement against a MyISAM table that altered a column without setting its size caused the binary log to become corrupted, leading to replication failure.
- 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.
- Replication: If there exist both a temporary table and a non-temporary table having the same, updates normally apply only to the temporary table, with the exception of a CREATE TABLE ... SELECT statement that creates a non-temporary table having the same name as an existing temporary table. When such a statement was replicated using the MIXED logging format, and the statement was unsafe for row-based logging, updates were misapplied to the temporary table.
- Replication: When a slave tried to execute a transaction larger than the slave's value for max_binlog_cache_size, it crashed. This was caused by an assertion that the server should roll back only the statement but not the entire transaction when the error ER_TRANS_CACHE_FULL occurred. However, the slave SQL thread always rolled back the entire transaction whenever any error occurred, regardless of the type of error.
- Replication: When making changes to relay log settings using CHANGE MASTER TO, the I/O cache was not cleared. This could result in replication failure when the slave attempted to read stale data from the cache and then stopped with an assertion.
- Replication: Trying to read from a binary log containing a log event of an invalid type caused the slave to crash.
- Replication: When replicating the mysql.tables_priv table, the Grantor column was not replicated, and was thus left empty on the slave.
- Handling of host name lettercase in GRANT statements was inconsistent.





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MySQL 5.1.54



# Functionality added or changed:

* Support for the IBMDB2I storage engine has been removed.
* The pstack library was nonfunctional and has been removed, along with the --with-pstack option for configure. The --enable-pstack option for mysqld is deprecated and will be removed in MySQL 5.5.

# Bugs fixed:

* Performance: InnoDB Storage Engine: Improved concurrency when several ANALYZE TABLE or SHOW TABLE STATUS statements are run simultaneously for InnoDB tables.
* InnoDB Storage Engine: For an InnoDB table created with ROW_FORMAT=COMPRESSED or ROW_FORMAT=DYNAMIC, a query using the READ UNCOMMITTED isolation level could cause the server to stop with an assertion error, if BLOB or other large columns that use off-page storage were being inserted at the same time.
* Partitioning: An INSERT ... ON DUPLICATE KEY UPDATE column = 0 statement on an AUTO_INCREMENT column caused the debug server to crash.
* Several compilation problems were fixed.
* Passing a string that was not null-terminated to UpdateXML() or ExtractValue() caused the server to fail with an assertion.
* Queries executed using the Index Merge access method and a temporary file could return incorrect results.
* The find_files() function used by SHOW statements performed redundant and unnecessary memory allocation.






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MySQL 5.1.55



# Bugs fixed:

* 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)
* 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)
See also Bug#57071.
* InnoDB Storage Engine: A compilation problem affected the InnoDB source code on NetBSD/sparc64. (Bug#59327)
See also Bug#53916.
* InnoDB Storage Engine: In InnoDB status output, the value for I/O sum[] could be incorrect, displayed as a very large number. (Bug#57600)
* 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)
* InnoDB Storage Engine: The OPTIMIZE TABLE statement would reset the auto-increment counter for an InnoDB table. Now the auto-increment value is preserved across this operation. (Bug#18274)
* Partitioning: Failed ALTER TABLE ... PARTITION statements could cause memory leaks. (Bug#56380)
See also Bug#46949, Bug#56996.
* Replication: When closing a session that used temporary tables, binary logging could sometimes fail with a spurious Failed to write the DROP statement for temporary tables to binary log. (Bug#57288)
* Replication: By default, a value is generated for an AUTO_INCREMENT column by inserting either NULL or 0 into the column. Setting the NO_AUTO_VALUE_ON_ZERO server SQL mode suppresses this behavior for 0, so that it occurs only when NULL is inserted into the column.
This behavior is also followed on a replication slave (by the slave SQL thread) when applying events that have been logged on the master using the statement-based format. However, when applying events that had been logged using the row-based format, NO_AUTO_VALUE_ON_ZERO was ignored, which could lead to an assertion.
To fix this issue, the value of an AUTO_INCREMENT column is no longer generated when applying an event that was logged using the row-based row format, as this value is already contained in the changes applied on the slave. (Bug#56662)
* Replication: The BINLOG statement modified the values of session variables, which could lead to problems with operations such a point-in-time recovery. One such case occurred when replaying a row-based binary log which relied on setting foreign_key_checks = OFF on the session level in order to create and populate a set of InnoDB tables having foreign key constraints. (Bug#54903)
* 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)
* Replication: Previously, when a statement failed with a different error on the slave than on the master, the slave SQL thread displayed a message containing:
- The error message for the master error code
- The master error code
- The error message for the slaves error code
- The slave error code
However, the slave has no information with which to fill in any print format specifiers for the master message, so it actually displayed the message format string. To make it clearer that the slave is not displaying the actual message as it appears on the master, the slave now indicates that the master part of the output is the message format, not the actual message. For example, previously the slave displayed information like this:
Error: "Query caused different errors on master and slave. Error on master: 'Duplicate entry '%-.192s' for key %d' (1062), Error on slave: 'no error' (0). Default database: 'test'. Query: 'insert into t1 values(1),(2)'" (expected different error codes on master and slave)
Now the slave displays this:
Error: "Query caused different errors on master and slave. Error on master: message format='Duplicate entry '%-.192s' for key %d' error code=1062 ; Error on slave: actual message='no error', error code=0. Default database: 'test'. Query: 'insert into t1 values(1),(2)'" (expected different error codes on master and slave) (Bug#46697)
* 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)
See also Bug#37148, Bug#40611, Bug#43929, Bug#51019.
* MIN(year_col) could return an incorrect result in some cases. (Bug#59211)
* If max_allowed_packet was set larger than 16MB, the server failed to reject too-large packets with “Packet too large” errors. (Bug#58887)
* Issuing EXPLAIN EXTENDED for a query that would use condition pushdown could cause mysqld to crash. (Bug#58553)
* EXPLAIN could crash for queries that used GROUP_CONCAT(). (Bug#58396)
* Configuration with maintainer mode enabled resulted in errors when compiling with icc. (Bug#57991, Bug#58871)
* Unnecessary subquery evaluation in contexts such as statement preparation or view creation could cause a server crash. (Bug#57703)
* View creation could produce Valgrind warnings. (Bug#57352)
* NULL geometry values could cause a crash in Item_func_spatial_collection::fix_length_and_dec. (Bug#57321)
* The cp1251 character set did not properly support the Euro sign (0x88). For example, converting a string containing this character to utf8 resulted in '?' rather than the utf8 Euro sign. (Bug#56639)
* Some unsigned system variables could be displayed with negative values. (Bug#55794)
* CREATE DATABASE and DROP DATABASE caused mysql --one-database to lose track of the statement-filtering context. (Bug#54899)
* An assertion could be raised during concurrent execution of DROP DATABASE and REPAIR TABLE if the drop deleted a table's .TMD file at the same time the repair tried to read details from the old file that was just removed.
A problem could also occur when DROP TABLE tried to remove all files belonging to a table at the same time REPAIR TABLE had just deleted the table's .TMD file. (Bug#54486)
* When mysqld printed crash dump information, it incorrectly indicated that some valid pointers were invalid. (Bug#51817)
* On FreeBSD, if mysqld was killed with a SIGHUP signal, it could corrupt InnoDB .ibd files. (Bug#51023)
* An assertion could be raised if –1 was inserted into an AUTO_INCREMENT column by a statement writing more than one row. (Bug#50619)
* If a client supplied a user name longer than the maximum 16 characters allowed for names stored in the MySQL grant tables, all characters were being considered significant. Historically, only the first 16 characters were used to check for a match; this behavior was restored. (Bug#49752)
* The my_seek() and my_tell() functions ignored the MY_WME flag when they returned an error, which could cause client programs to hang. (Bug#48451)
* During assignment of values to system variables, legality checks on the value range occurred too late, preventing proper error checking. (Bug#43233)
* On Solaris, time-related functions such as NOW() or SYSDATE() could return a constant value. (Bug#42054)
* If the remote server for a FEDERATED table could not be accessed, queries for the INFORMATION_SCHEMA.TABLES table failed. (Bug#35333)




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MySQL 5.1.56





# Bugs fixed:

* InnoDB Storage Engine: InnoDB returned values for “rows examined” in the query plan that were higher than expected. NULL values were treated in an inconsistent way. The inaccurate statistics could trigger “false positives” in combination with the MAX_JOIN_SIZE setting, because the queries did not really examine as many rows as reported.
* Partitioning: Trying to use the same column more than once in the partitioning key when partitioning a table by KEY caused mysqld to crash. Such duplication of key columns is now expressly disallowed, and fails with an appropriate error.
* 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.)
* 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 wich 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.
* 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.
* DELETE or UPDATE statements could fail if they used DATE or DATETIME values with a year, month, or day part of zero.
* The ESCAPE clause for the LIKE operator allows only expressions that evaluate to a constant at execution time, but aggregrate functions were not being rejected.
* Memory leaks detected by Valgrind, some of which could cause incorrect query results, were corrected.
* mysqlslap failed to check for a NULL return from mysql_store_result() and crashed trying to process the result set.
* In debug builds, SUBSTRING_INDEX(FORMAT(...), FORMAT(...)) could cause a server crash.
* When mysqldadmin was run with the --sleep and --count options, it went into an infinite loop executing the specified command.
* 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.
* Parsing nested regular expressions could lead to recursion resulting in a stack overflow crash.
* The mysql client went into an infinite loop if the standard input was a directory.
* The expression const1 BETWEEN const2 AND field was optimized incorrectly and produced incorrect results.
* 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.
* On FreeBSD and OpenBSD, the server incorrectly checked the range of the system date, causing legal values to be rejected.
* 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.




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Napisano: 16 Mar 2011 16:00

MySQL 5.5.10


# Bugs fixed:

* InnoDB Storage Engine: Raised the number of I/O requests that each AIO helper thread could process, from 32 to 256. The new limit applies to Linux and Unix platforms; the limit on Windows remains 32.
* InnoDB Storage Engine: InnoDB returned values for “rows examined” in the query plan that were higher than expected. NULL values were treated in an inconsistent way. The inaccurate statistics could trigger “false positives” in combination with the MAX_JOIN_SIZE setting, because the queries did not really examine as many rows as reported.
* 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.)
* 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.
* DES_DECRYPT() could crash if the argument was not produced by DES_ENCRYPT().
* The server and client did not always properly negotiate authentication plugin names.
* --autocommit=ON did not work (it set the global autocommit value to 0, not 1).
* 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;
* SHOW PRIVILEGES did not display a row for the PROXY privilege.
* SHOW PROFILE could truncate source file names or fail to show function names.
* DELETE or UPDATE statements could fail if they used DATE or DATETIME values with a year, month, or day part of zero.
* 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.
* Memory leaks detected by Valgrind, some of which could cause incorrect query results, were corrected.
* The DEFAULT_CHARSET and DEFAULT_COLLATION CMake options did not work.
* An OUTER JOIN query using WHERE column IS NULL could return an incorrect result.
* Starting the server with the --defaults-file=file_name option, where the file name had no extension, caused a server crash.
* Outer joins with an empty table could produce incorrect results.
* In debug builds, SUBSTRING_INDEX(FORMAT(...), FORMAT(...)) could cause a server crash.
* When mysqladmin was run with the --sleep and --count options, it went into an infinite loop executing the specified command.
* 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.
* Parsing nested regular expressions could lead to recursion resulting in a stack overflow crash.
* 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.
* The mysql client went into an infinite loop if the standard input was a directory.
* Outer joins on a unique key could return incorrect results.
* The expression const1 BETWEEN const2 AND field was optimized incorrectly and produced incorrect results.
* 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.
* On FreeBSD and OpenBSD, the server incorrectly checked the range of the system date, causing legal values to be rejected.
* Sorting using ORDER BY AVG(DISTINCT decimal_col) caused a server crash or incorrect results.
* 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.
* 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.


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Dopuna: 08 Apr 2011 12:32

MySQL 5.5.11


# Bugs fixed:

* Partitioning: A problem with a previous fix for poor performance of INSERT ON DUPLICATE KEY UPDATE statements on tables having many partitions caused the handler function for reading a row from a specific index to fail to store the ID of the partition last used. This caused some statements to fail with Can't find record errors.
* 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.
* On some systems, debug builds of comp_err.c could fail due to an uninitialized variable.
* The server read one byte too many when trying to process an XML string lacking a closing quote (') or double quote (") character used as an argument for UpdateXML() or ExtractValue().
* 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.
* Aggregation followed by a subquery could produce an incorrect result.
* An incorrect character set pointer passed to my_strtoll10_mb2() caused an assertion to be raised.
* 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.
* The MYSQL_HOME environment variable was being ignored.
* 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.
* SHOW WARNINGS output following EXPLAIN EXTENDED could include unprintable characters.
* 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.
* Bitmap functions used in one thread could change bitmaps used by other threads, causing an assertion to be raised.

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MySQL 5.5.12



# Bugs fixed:

- InnoDB Storage Engine: Replication: Trying to update a column, previously set to NULL, of an InnoDB table with no primary key caused replication to fail with Can't find record in 'table' on the slave.
- InnoDB Storage Engine: The server could halt if InnoDB interpreted a very heavy I/O load for 15 minutes or more as an indication that the server was hung. This change fixes the logic that measures how long InnoDB threads were waiting, which formerly could produce false positives.
- InnoDB Storage Engine: With the setting lower_case_table_names=2, inserts into InnoDB tables covered by foreign key constraints could fail after a server restart.
- Replication: Using the --server-id option with mysqlbinlog could cause format description log events to be filtered out of the binary log, leaving mysqlbinlog unable to read the remainder of the log. Now such events are always read without regard to the value of this option.
- As part of the the fix for this problem, mysqlbinlog now also reads rotate log events without regard to the value of --server-id.
- On Windows, the server rejected client connections if no DNS server was available.
- mysql_upgrade did not properly upgrade the authentication_string column of the mysql.user table.
- InnoDB invoked some zlib functions without proper initialization.
- Comparison of a DATETIME stored program variable and NOW() led to an “Illegal mix of collations error” when character_set_connection was set to utf8. (Bug #60625, Bug #11926811)
- Selecting from a view for which the definition included a HAVING clause failed with an error:
* 1356: View '...' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
- CREATE TABLE syntax permits specification of a STORAGE {DEFAULT|DISK|MEMORY} option. However, this value was not written to the .frm file, so that a subsequent CREATE TABLE ... LIKE for the table did not include that option.
* Also, ALTER TABLE of a table that had a tablespace incorrectly destroyed the tablespace.
- The server permitted max_allowed_packet to be set lower than net_buffer_length, which does not make sense because max_allowed_packet is the upper limit on net_buffer_length values. Now a warning occurs and the value remains unchanged.
- A missing variable initialization for Item_func_set_user_var objects could cause an assertion to be raised.
- When the server was started with the --skip-innodb option, it initialized the have_innodb system variable to YES rather than DISABLED.
- In Item_func_month::val_str(), a Valgrind warning for a too-late NULL value check was corrected.
- In Item::get_date, a Valgrind warning for a missing NULL value check was corrected.
- In extract_date_time(), a Valgrind warning for a missing end-of-string check was corrected.
- In string context, the MIN() and MAX() functions did not take into account the unsignedness of a BIGINT UNSIGNED argument.
- In Item_func::val_decimal, a Valgrind warning for a missing NULL value check was corrected.
- In Item_func_str_to_date::val_str, a Valgrind warning for an uninitialized variable was corrected.
- An assertion could be raised in Item_func_int_val::fix_num_length_and_dec() due to overflow for geometry functions.
- With prepared statements, the server could attempt to send result set metadata after the table had been closed.
- With lower_case_table_names=2, resolution of objects qualified by database names could fail.
- SHOW EVENTS did not always show events from the correct database.





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MySQL 5.5.13



# Bugs fixed:

* InnoDB Storage Engine: If the server crashed while an XA transaction was prepared but not yet committed, the transaction could remain in the system after restart, and cause a subsequent shutdown to hang.
* InnoDB Storage Engine: Similar problem to the foreign key error in bug #11831040 / 60196 / 60909, but with a different root cause and occurring on Mac OS X. With the setting lower_case_table_names=2, inserts into InnoDB tables covered by foreign key constraints could fail after a server restart.
* Partitioning: The internal get_partition_set() function did not take into account the possibility that a key specification could be NULL in some cases.
* Partitioning: When executing a row-ordered retrieval index merge, the partitioning handler used memory from from that allocated for the table, rather than that allocated to the query, causing table object memory not to be freed until the table was closed.
* Replication: A spurious error malformed binlog: it does not contain any Format_description_log_event... was generated when mysqlbinlog was invoked using --base64-output=decode-row and --start-position=pos, where pos is a point in the binary log past the format description log event. However, there is nothing unsafe about not printing the format description log event, so the error has been removed for this case.
* Replication: Typographical errors appeared in the text of several replication error messages. (The word “position” was misspelled as “postion”.)
* Assignments to NEW.var_name within triggers, where var_name had a BLOB or TEXT type, were not properly handled and produced incorrect results.
* XA COMMIT could fail to clean up the error state if it discovered that the current XA transaction had to be rolled back. Consequently, the next XA transaction could raise an assertion when it checked for proper cleanup of the previous transaction.
* An internal client macro reference was removed from the client_plugin.h header file. This reference made the file unusable.
* The server consumed memory for repeated invocation of some stored procedures, which was not released until the connection terminated.
* The server did not check for certain invalid out of order sequences of XA statements, and these sequences raised an assertion.
* With the conversion from GNU autotools to CMake for configuring MySQL, the USE_SYMDIR preprocessor symbol was omitted. This caused failure of symbolic links (described at Section 7.11.3.1, “Using Symbolic Links”).
* The incorrect max_length value for YEAR values could be used in temporary result tables for UNION, leading to incorrect results.
* In Item_func_in::fix_length_and_dec(), a Valgrind warning for uninitialized values was corrected.
* In ROUND() calculations, a Valgrind warning for uninitialized memory was corrected.
* Valgrind warnings caused by comparing index values to an uninitialized field were corrected.
* LOAD DATA INFILE errors could leak I/O cache memory.
* For LOAD DATA INFILE, multibyte character sequences could be pushed onto a stack too small to accommodate them.
* Internal Performance Schema header files were unnecessarily installed publicly.
* On Linux, the mysql client built using the bundled libedit did not read ~/.editrc.
* The optimizer sometimes incorrectly processed HAVING clauses for queries that did not also have an ORDER BY clause.
* PROCEDURE ANALYZE() could leak memory for NULL results, and could return incorrect results if used with a LIMIT clause.
* With DISTINCT CONCAT(col,...) returned incorrect results when the arguments to CONCAT() were columns with an integer data type declared with a display width narrower than the values in the column. (For example, if an INT(1) column contain 1111.)




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Napisano: 06 Jul 2011 21:34

MySQL 5.5.14



# Functionality added or changed:

* CMake configuration support on Linux now provides a boolean ENABLE_GCOV option to control whether to include support for gcov.
* Client programs now display more information for SSL errors to aid in diagnosis and debugging of connection problems.
* In the audit plugin interface, the event_class member was removed from the mysql_event_general structure and the calling sequence for the notification function changed. Originally, the second argument was a pointer to the event structure. The function now receives this information as two arguments: an event class number and a pointer to the event. Corresponding to these changes, MYSQL_AUDIT_INTERFACE_VERSION was increased to 0x0300.


# Bugs fixed:
* Replication: A mistake in thread cleanup could cause a replication master to crash.
* Replication: When using row-based replication and attribute promotion or demotion (see Section 15.4.1.6.2, “Replication of Columns Having Different Data Types”), memory allocated internally for conversion of BLOB columns was not freed afterwards.
* Adding support for Windows authentication to libmysql introduced a link dependency on the system Secur32 library. The Microsoft Visual C++ link information was modified to pull in this library automatically.
* In some cases, memory allocated for Query_tables_list::sroutines() was not freed properly.
* After the fix for Bug#11889186, MAKEDATE() arguments with a year part greater than 9999 raised an assertion.
* An assertion could be raised due to a missing NULL value check in Item_func_round::fix_length_and_dec().
* An assertion could be raised during two-phase commits if the binary log was used as the transaction coordinator log.
* A problem introduced in 5.5.11 caused very old (MySQL 4.0) clients to be unable to connect to the server.
* Using CREATE EVENT IF NOT EXISTS for an event that already existed and was enabled caused multiple instances of the event to run.
* An embedded client would abort rather than issue an error message if it issued a TEE command (\T file_name) and the directory containing the file did not exist. This occurred because the wrong error handler was called.
* On some platforms, the Incorrect value: xxx for column yyy at row zzz error produced by LOAD DATA INFILE could have an incorrect value of zzz.
* An attempt to install nonexistent files during installation was corrected.
* On FreeBSD 64-built builds of the embedded server, exceptions were not prevented from propagating into the embedded application.



Dopuna: 28 Jul 2011 14:15

MySQL 5.5.15



# Bugs Fixed :
* InnoDB Storage Engine: A failed CREATE INDEX operation for an InnoDB table could result in some memory being allocated and not freed. This memory leak could affect tables created with the ROW_FORMAT=DYNAMIC and ROW_FORMAT=COMPRESSED settings.
* Partitioning: Auto-increment columns of partitioned tables were checked even when they were not being written to. In debug builds, this could lead to a crash of the server.
* Partitioning: The UNIX_TIMESTAMP() function was not treated as a monotonic function for purposes of partition pruning.
* Replication: If a LOAD DATA INFILE statement—replicated using statement-based replication—featured a SET clause, the name-value pairs were regenerated using a method (Item::print()) intended primarily for generating output for statements such as EXPLAIN EXTENDED, and which cannot be relied on to return valid SQL. This could in certain cases lead to a crash on the slave. To fix this problem, we now name each value in its original, user-supplied form, and use that to create LOAD DATA INFILE statements for statement-based replication.
* Previously, an inappropriate error message was produced if a multiple-table update for an InnoDB table with a clustered primary key would update a table through multiple aliases, and perform an update that may physically move the row in at least one of these aliases. Now the error message is: Primary key/partition key update is not allowed since the table is updated both as 'tbl_name1' and 'tbl_name2'
* ALTER TABLE {MODIFY|CHANGE} ... FIRST did nothing except rename columns if the old and new versions of the table had exactly the same structure with respect to column data types. As a result, the mapping of column name to column data was incorrect. The same thing happened for ALTER TABLE DROP COLUMN, ADD COLUMN statements intended to produce a new version of table with exactly the same structure as the old version.
* Incorrect handling of metadata locking for FLUSH TABLES WITH READ LOCK for statements requiring prelocking caused two problems:
- Execution of any data-changing statement that required prelocking (that is, involved a stored function or trigger) as part of transaction slowed down somewhat all subsequent statements in the transaction. Performance in a transaction that periodically involved such statements gradually degraded over time.
- Execution of any data-changing statement that required prelocking as part of transaction prevented a concurrent FLUSH TABLES WITH READ LOCK from proceeding until the end of transaction rather than at the end of the particular statement.
* The fractional part of the “Queries per second” value in MySQL status output could be displayed incorrectly.
* LOAD DATA INFILE incorrectly parsed relative data file path names that ascended more than three levels in the file system and as a consequence was unable to find the file.
* For MyISAM tables, attempts to insert incorrect data into an indexed GEOMETRY column could result in table corruption.
* In debug builds, Field_new_decimal::store_value() was subject to buffer overflows.
* A race condition between loading a stored routine using the name qualified by the database name and dropping that database resulted in a spurious error message: The table mysql.proc is missing, corrupt, or contains bad data