Log Message:
mysql57: updated to 5.7.36

Changes in MySQL 5.7.36

Security Notes

Bugs Fixed

Security Notes

The linked OpenSSL library for MySQL Server has been updated to version 1.1.1l. \ 
Issues fixed in the new OpenSSL version are described at \ 
https://www.openssl.org/news/cl111.txt and and \ 
http://www.openssl.org/news/vulnerabilities.html.

Bugs Fixed

Incompatible Change: For all SELECT statements on a view, the query digest was \ 
based on the view definition. As a result, different queries had the same digest \ 
and aggregated together in the Performance Schema table \ 
events_statements_summary_by_digest, so statistics in that table were not usable \ 
for distinguishing distinct SELECT statements.

The query digest for each SELECT statement on a view now is based on the SELECT, \ 
not the view definition. This enables distinguishing distinct SELECT statements \ 
in the events_statements_summary_by_digest table. However, tools that use query \ 
digests may need some adjustment to account for this change. For example, MySQL \ 
Enterprise Firewall and query rewrite plugins rely on query digests and existing \ 
rules for them that are associated with views may need to be updated.

InnoDB: With undo log truncation enabled (innodb_undo_log_truncate=ON), it was \ 
possible for a deadlock and eventual failure to occur when an undo log truncate \ 
operation was initiated after a version upgrade from MySQL 5.6 to MySQL 5.7.34 \ 
or earlier. A patch introduced in MySQL 5.7.35

[Note] InnoDB: Found duplicate reference rseg: 33 space: 1 page: 3
[Note] InnoDB: Reset pre-5.7.2 rseg: 1 after duplicate is found.
If pre-5.7.2 rollback segment slots have no undo data to purge, a message \ 
similar to the following is emitted:

[Note] InnoDB: Successfully reset 32 pre-5.7.2 rseg slots.
If undo data is found in pre-5.7.2 rollback segment slots, a message similar to \ 
the following is emitted recommending a slow shutdown and restart:

[Note] InnoDB: pre-5.7.2 rseg: 2 holds data to be purged.
History length: 1. Recommend slow shutdown with innodb_fast_shutdown=0 and restart

InnoDB: Truncation of an undo tablespace during use by an active transaction \ 
raised an assertion failure. The transaction was prematurely marked as complete, \ 
permitting the truncation operation.

InnoDB: Deleting or updating a row from a parent table initiated a cascading SET \ 
NULL operation on the child table that set a virtual column value to NULL. The \ 
virtual column value should have been derived from the base column value.

Thanks to Yin Peng at Tencent for the contribution.

InnoDB: The InnoDB recovery process did not recognize that page compression had \ 
been applied to data that was being recovered, causing the tablespace data file \ 
to increase in size during the redo log apply phase, which could lead to a \ 
recovery failure for systems approaching a disk-full state.

Replication: The error messages issued by MySQL Replication when GTIDs required \ 
for auto-positioning have been purged could be incorrectly assigned or scrambled \ 
in some situations.

Replication: The contents of the gtid_executed and gtid_purged GTID sets were \ 
not persisted after restoring a dump taken using mysqldump. The dump file \ 
sequence has now been changed so that the mysql schema (which contains the \ 
mysql.gtid_executed table) is not dropped after the gtid_purged GTID set is \ 
written. A new option --skip-mysql-schema is added for mysqldump which lets you \ 
choose not to drop the mysql schema at all.

JSON: Conversion of JSON values to text caused linear growth of the destination \ 
string, resulting in an unnecessarily high number of reallocations. Now this \ 
process uses exponential growth instead, to reduce the number of allocations \ 
required.

This fix originally appeared in MySQL 8.0 and was backported to MySQL 5.7 by \ 
Annirudh Prasad, whom we thank for the contribution.

Concurrent insert operations on multiple tables with full-text indexes caused a \ 
large number of full-text index synchronization requests, resulting in an out of \ 
memory condition.

When a query uses a temporary table for aggregation, the group by item is used \ 
as a unique constraint on the temporary table: If the item value is already \ 
present, the row is updated; otherwise, a new row is inserted into the temporary \ 
table. If the item has a result field or reference item, it it evaluated twice, \ 
once to check whether the result exists in the temporary table and, if not, \ 
again while constructing the row to be inserted. When the group by item was \ 
nondeterministic, the result value used to check for existence differed from \ 
that with which an insert was attempted, causing the insert to be rejected if \ 
the value already existed in the table.

We fix this by using the hash of any nondeterministic items as the unique \ 
constraint, so that the hash is evaluated once only.

Quote handling was improved for the SHOW GRANTS statement.