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TiDB 3.0.3 Release Notes
Release date: August 29, 2019
TiDB version: 3.0.3
TiDB Ansible version: 3.0.3
TiDB
- SQL Optimizer
- Add the
opt_rule_blacklist
table to disable logic optimization rules such asaggregation_eliminate
andcolumn_prune
#11658 - Fix the issue that incorrect results might be returned for
Index Join
when the join key uses a prefix index or an unsigned index column that is equal to a negative value #11759 - Fix the issue that
”
or\
in theSELECT
statements ofcreate … binding ...
might result in parsing errors #11726
- Add the
- SQL Execution Engine
- Fix the issue that type errors in the return value might occur when the Quote function handles a null value #11619
- Fix the issue that incorrect results for
ifnull
might be returned when Max/Min is used for type inferring withNotNullFlag
retained #11641 - Fix the potential error that occurs when comparing bit type data in string form #11660
- Decrease the concurrency for data that requires sequential read to lower the possibility of OOM #11679
- Fix the issue that incorrect type inferring might be caused when multiple parameters are unsigned for some built-in functions (for example,
if
andcoalesce
) #11621 - Fix the incompatibility with MySQL when the
Div
function handles unsigned decimal types #11813 - Fix the issue that panic might occur when executing SQL statements that modify the status of Pump/Drainer #11827
- Fix the issue that panic might occur for
select ... for update
when Autocommit = 1 and there is nobegin
statement #11736 - Fix the permission check error that might occur when the
set default role
statement is executed #11777 - Fix the permission check error that might occur when
create user
ordrop user
is executed #11814 - Fix the issue that the
select ... for update
statement might auto retry when it is constructed into thePointGetExecutor
function #11718 - Fix the boundary error that might occur when the Window function handles partition #11825
- Fix the issue that the
time
function hits EOF errors when handling an incorrectly formatted argument #11893 - Fix the issue that the Window function does not check the passed-in parameters #11705
- Fix the issue that the plan result viewed via
Explain
is inconsistent with the actually executed plan #11186 - Fix the issue that duplicate memory referenced by the Window function might result in a crash or incorrect results #11823
- Update the incorrect information in the
Succ
field in the slow log #11887
- Server
- DDL
- Skip the execution of unsupported partition-related DDL statements, including statements that modify the partition type while deleting multiple partitions #11373
- Disallow a Generated Column to be placed before its dependent columns #11686
- Modify the default values of
tidb_ddl_reorg_worker_cnt
andtidb_ddl_reorg_batch_size
#11874
- Monitor
- Add new backoff monitoring types to record duration for each backoff type; add more backoff metrics to cover previously uncounted types such as commit backoff #11728
TiKV
- Fix the issue that ReadIndex might fail to respond to requests because of duplicate context #5256
- Fix potential scheduling jitters caused by premature
PutStore
#5277 - Fix incorrect timestamps reported from Region heartbeats #5296
- Reduce the size of core dump by excluding the shared block cache from it #5322
- Fix potential TiKV panics during region merge #5291
- Speed up leader change check for the dead lock detector #5317
- Support using
grpc env
to create deadlock clients #5346 - Add
config-check
to check whether the configuration is correct #5349 - Fix the issue that ReadIndex does not return anything when there is no leader #5351
PD
- Return success message for
pdctl
#1685
Tools
- TiDB Binlog
- TiDB Lightning:
- Skip the system databases
mysql
,information_schema
,performance_schema
, andsys
by default when importing #225
- Skip the system databases
TiDB Ansible
- Optimize PD operations for rolling update to improve stability #894
- Remove the Grafana Collector components that are not supported by the current Grafana version #892
- Update TiKV alerting rules #898
- Fix the issue that the generated TiKV configuration misses the
pessimistic-txn
parameter #911 - Update Spark to V2.4.3, and update TiSpark to V2.1.4 that is compatible with Spark V2.4.3 #913, #918
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