tcmallocis no longer a permitted value for the mysqld_safe
--malloc-liboption. (Bug #31372027)
This change affects users of the mysqldump command, which accesses tablespace information in the
FILEStable, and thus now requires the
PROCESSprivilege as well. Users who do not need to dump tablespace information can work around this requirement by invoking mysqldump with the
--no-tablespacesoption. (Bug #30350829)
The linked OpenSSL library for MySQL Server has been updated to version 1.1.1g. Issues fixed in the new OpenSSL version are described at https://www.openssl.org/news/cl111.txt and https://www.openssl.org/news/vulnerabilities.html. (Bug #31296697)
Partitioning: A query against a partitioned table, which used an
ORDER BY, returned unordered results under the following conditions:
The table had a composite index with a prefix on one of the columns.
WHEREclause contained an equality condition on the prefixed column.
The column with the prefix was the leftmost column in the index.
The column used in the
ORDER BYwas the rightmost column in the index.
The index was used for handling the
Our thanks to Quanan Han for the contribution. (Bug #84070, Bug #25207522)
Replication: When a replication source server shuts down and restarts, its
MEMORYtables become empty. To replicate this effect to replicas, the first time that the source uses a given
MEMORYtable after startup, it notifies replicas that the table must be emptied by writing a
DELETEstatement for that table to the binary log. Previously, the generated
DELETEstatement was written to the binary log statement cache for the current session, which could result in it being logged together with other statements under the same GTID, or logged without
COMMITstatements. Also, in some situations, the generated
DELETEstatement could consume the GTID intended for the transaction that triggered it. The generated
DELETEstatement is now logged with accompanying
COMMITstatements, and the resulting transaction is flushed to the binary log immediately after it is written to the statement cache, so that it always receives its own GTID and is kept separate from other transactions. (Bug #30527929, Bug #25681518, Bug #77729)
mysql_store_result()could fail to detect invalid data packets. (Bug #29921423)
The server sometimes mistakenly removed a subquery with a
GROUP BYwhen optimizing a query, even in some cases when this subquery was used by an outer select. This could occur when the subquery also used an aggregate function. (Bug #28240054)