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TiDB 3.0.5 Release Notes
Release date: October 25, 2019
TiDB version: 3.0.5
TiDB Ansible version: 3.0.5
TiDB
- SQL Optimizer
- Support boundary checking on Window Functions #12404
- Fix the issue that
IndexJoin
on the partition table returns incorrect results #12712 - Fix the issue that the
ifnull
function on the top of the outer joinApply
operator returns incorrect results #12694 - Fix the issue of update failure when a subquery was included in the
where
condition ofUPDATE
#12597 - Fix the issue that outer join was incorrectly converted to inner join when the
cast
function was included in the query conditions #12790 - Fix incorrect expression passing in the join condition of
AntiSemiJoin
#12799 - Fix the statistics error caused by shallow copy when initializing statistics #12817
- Fix the issue that the
str_to_date
function in TiDB returns a different result from MySQL when the date string and the format string do not match #12725
- SQL Execution Engine
- Fix the panic issue when the
from_unixtime
function handles null #12551 - Fix the
invalid list index
error reported when canceling DDL jobs #12671 - Fix the issue that arrays were out of bounds when Window Functions are used #12660
- Improve the behavior of the
AutoIncrement
column when it is implicitly allocated, to keep it consistent with the default mode of MySQL auto-increment locking ("consecutive" lock mode): for the implicit allocation of multipleAutoIncrement
IDs in a single-lineInsert
statement, TiDB guarantees the continuity of the allocated values. This improvement ensures that the JDBCgetGeneratedKeys()
method will get the correct results in any scenario. #12602 - Fix the issue that the query is hanged when
HashAgg
serves as a child node ofApply
#12766 - Fix the issue that the
AND
andOR
logical expressions return incorrect results when it comes to type conversion #12811
- Fix the panic issue when the
- Server
- Implement the interface function that modifies transaction TTL to help support large transactions later #12397
- Support extending the transaction TTL as needed (up to 10 minutes) to support pessimistic transactions #12579
- Adjust the number of times that TiDB caches schema changes and corresponding changed table information from 100 to 1024, and support modification by using the
tidb_max_delta_schema_count
system variable #12502 - Update the behavior of the
kvrpc.Cleanup
protocol to no longer clean locks of transactions that are not overtime #12417 - Support logging Partition table information to the
information_schema.tables
table #12631 - Support modifying the TTL of Region Cache by configuring
region-cache-ttl
#12683 - Support printing the execution plan compression-encoded information in the slow log. This feature is enabled by default and can be controlled by using the
slow-log-plan
configuration or thetidb_record_plan_in_slow_log
variable. In addition, thetidb_decode_plan
function can decode the execution plan column encoded information in the slow log into execution plan information. #12808 - Support displaying memory usage information in the
information_schema.processlist
table #12801 - Fix the issue that an error and an unexpected alarm might occur when the TiKV Client judges an idle connection #12846
- Fix the issue that the
INSERT IGNORE
statement performance is decreased becausetikvSnapshot
does not properly cache the KV results ofBatchGet()
#12872 - Fix the issue that the TiDB response speed was relatively low because of slow connection to some KV services #12814
- DDL
- Fix the issue that the
Create Table
operation does not correctly set the Int type default value for the Set column #12267 - Support multiple
unique
s when creating a unique index in theCreate Table
statement #12463 - Fix the issue that populating the default value of this column for existing rows might cause an error when adding a Bit type column using
Alter Table
#12489 - Fix the failure of adding a partition when the Range partitioned table uses a Date or Datetime type column as the partitioning key #12815
- Support checking the consistency of the partition type and the partition key type when creating a table or adding a partition, for the Range partitioned table with the Date or Datetime type column as the partition key #12792
- Add a check that the Unique Key column set needs to be greater than or equal to the partitioned column set when creating a Range partitioned table #12718
- Fix the issue that the
- Monitor
TiKV
- Storage
- Add a new feature of pessimistic transactions: the transaction cleanup interface supports only cleaning up locks whose TTL is outdated #5589
- Fix the issue that Rollback of the transaction Primary key is collapsed #5646, #5671
- Fix the issue that under pessimistic locks, point queries might return the previous version data #5634
- Raftstore
- Reduce message flush operations in Raftstore to improve performance and reduce CPU usage #5617
- Optimize the cost of obtaining the Region size and estimated number of keys, to reduce heartbeat overhead and CPU usage #5620
- Fix the issue that Raftstore prints an error log and encounters a panic when getting invalid data #5643
- Engine
PD
- Improve the precision of storage occupied by Regions #1782
- Improve the output of the
--help
command #1763 - Fix the issue that the HTTP request fails to redirect after TLS is enabled #1777
- Fix the panic issue occurred when pd-ctl uses the
store shows limit
command #1808 - Improve readability of label monitoring metrics and reset the original leader's monitoring data when the leader switches, to avoid false reports #1815
Tools
- TiDB Binlog
- Fix the issue that
ALTER DATABASE
related DDL operations cause Drainer to exit abnormally #769 - Support querying the transaction status information for Commit binlog to improve replication efficiency #757
- Fix the issue that a Pump panic might occur when Drainer's
start_ts
is greater than Pump's largestcommit_ts
#758
- Fix the issue that
- TiDB Lightning
- Integrate the full logic import feature of Loader and support configuring the backend mode #221
TiDB Ansible
- Add the monitoring metrics of adding index speed #986
- Simplify the configuration file content and remove parameters that users do not need to configure #1043c, #998
- Fix the monitoring expression error of performance read and performance write #e90e7
- Update the monitoring display method and the alarm rules of Raftstore CPU usage #992
- Update the TiKV CPU monitoring item in the Overview monitoring dashboard to filter out the excess monitoring content #1001
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