Log Message:
mysql57: updated to 5.7.30

Changes in MySQL 5.7.30:

JSON Notes

The rapidjson library included with MySQL has been upgraded to the GitHub \ 
snapshot of 16 January 2020. A fix for a compiler error encountered when \ 
building from the snapshot on Mac OS X has been added.

Packaging Notes

Binary packages that include curl rather than linking to the system curl library \ 
have been upgraded to use curl 7.69.0.

The bundled libedit library was upgraded to version 3.1.

Bugs Fixed

InnoDB: The row_upd_clust_rec_by_insert function, which marks a clustered index \ 
record as deleted and inserts an updated version of the record into the \ 
clustered index, passed an incorrect n_ext value (the total number of external \ 
fields) to lower level functions, causing an assertion failure.

InnoDB: An operation performed with the innodb_buffer_pool_evict debug variable \ 
set to uncompressed caused an assertion failure.

InnoDB: An add column operation caused an assertion failure. The failure was due \ 
to a dangling pointer.

InnoDB: Updating certain InnoDB system variables that take string values raised \ 
invalid read errors during Valgrind testing.

InnoDB: An insert statement on a table with a spatial index raised a record type \ 
mismatch assertion due to a tuple corruption.

InnoDB: A function that calculates undo log record size could calculate an \ 
incorrect length value in the case of a corrupted undo log record, resulting in \ 
a malloc failure. Assertion code was added to detect incorrect calculations.

Replication: While an SQL statement was in the process of being rewritten for \ 
the binary log so that sensitive information did not appear in plain text, if a \ 
SHOW PROCESSLIST statement was used to inspect the query, the query could become \ 
corrupted when it was written to the binary log, causing replication to stop. \ 
The process of rewriting the query is now kept private, and the query thread is \ 
updated only when rewriting is complete.

Replication: When a GRANT or REVOKE statement is only partially executed, an \ 
incident event is logged in the binary log, which makes the replication slave's \ 
applier thread stop so that the slave can be reconciled manually with the \ 
master. Previously, if a failed GRANT or REVOKE statement was the first \ 
statement executed in the session, no GTID was applied to the incident event \ 
(because the cache manager did not yet exist for the session), causing an error \ 
on the replication slave. Also, no incident event was logged in the situation \ 
where a GRANT statement created a user but then failed because the privileges \ 
had been specified incorrectly, again causing an error on the replication slave. \ 
Both these issues have now been fixed.

Replication: When a replication slave has a generated column that the master \ 
does not have in that table, with a secondary index on the generated column, the \ 
generated expression should be evaluated and the value stored by the storage \ 
engine in the secondary index. When row-based binary logging is in use, the \ 
replication slave assigns default values to any fields that are not in the \ 
master's definition of the table. In the case of a generated column, which does \ 
not have a default value, the slave was previously assigning a null or a zero \ 
value to the column. This value was then stored by the storage engine in the \ 
secondary index, causing both the table and the index to become corrupted. To \ 
fix this issue, generated columns in a table on a replication slave are now \ 
re-evaluated before the values are sent to the storage engine.

Replication: In the event of an unplanned disconnection of a replication slave \ 
from the master, the reference to the master's dump thread might not be removed \ 
from the list of registered slaves, in which case statements that accessed the \ 
list of slaves would fail. The issue has now been fixed.

Replication: With the settings binlog_format=MIXED, tx_isolation=READ-COMMITTED, \ 
and binlog_row_image=FULL, an INSERT ... SELECT query involving a transactional \ 
storage engine omitted any columns with a null value from the row image written \ 
to the binary log. This happened because when processing INSERT ... SELECT \ 
statements, the columns were marked for inserts before the binary logging format \ 
was selected. The issue has now been fixed.

The -libs-compat RPM package is now built with system zlib to avoid problems \ 
with unrestricted export of symbols in libmysqlclient.so.18.

The Event Scheduler had a memory leak.

Under certain circumstances, a memcached command could result in reading an \ 
uninitialized memory buffer, causing a failure.

Using ALTER USER to reset an account MAX_USER_CONNECTIONS value did not take \ 
effect until all current account connections terminated, if there were any.

A materialized subquery including a condition in which a column value was used \ 
as input to a nondeterministic function produced incorrect results.

CONCAT() and CONCAT_WS() could produce incorrect results in rare cases due to \ 
incorrect substring handling.

Scheduling of events could be disturbed by removing events.

Client programs could load authentication plugins from outside the plugin library.

The server did not handle correctly a UNION in which one of the queries \ 
contained a subquery that used ORDER BY.

A query with a WHERE clause whose predicate contained a numeric value in \ 
scientific notation was not handled correctly.

In addition, attempting to insert a particular integer specified as a string \ 
caused a server exit when the string-to-integer conversion was not successful.

Previously, mysqlpump read the [mysql_dump] and [client] groups from option \ 
files. mysqlpump now additionally reads the [mysqlpump] group. The [mysql_dump] \ 
group is still accepted but is deprecated.

A multi-table UPDATE statement which updated a table joined to a derived table \ 
that joined two other tables was not optimized properly as it had been in MySQL \ 
5.6, instead being treated as if STRAIGHT_JOIN had been used with the subquery \ 
creating the derived table.