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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: TiDB 4.0.6 Release Notes | ||
| --- | ||
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| # TiDB 4.0.6 Release Notes | ||
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| Release date: September 15, 2020 | ||
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| TiDB version: 4.0.6 | ||
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| ## New Features | ||
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| + TiFlash | ||
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| - Support outer join in TiFlash broadcast join | ||
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| + TiDB Dashboard | ||
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| - Add Query Editor and execution UI (experimental) [#713](https://github.com/pingcap-incubator/tidb-dashboard/pull/713) | ||
| - Support store location topology visualization [#719](https://github.com/pingcap-incubator/tidb-dashboard/pull/719) | ||
| - Add cluster configuration UI (experimental) [#733](https://github.com/pingcap-incubator/tidb-dashboard/pull/733) | ||
| - Support sharing the current session [#741](https://github.com/pingcap-incubator/tidb-dashboard/pull/741) | ||
| - Support displaying the number of execution plans in SQL Statement list [#746](https://github.com/pingcap-incubator/tidb-dashboard/pull/746) | ||
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| + Tools | ||
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| + TiCDC | ||
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| - Support outputting data in the `maxwell` format [#869](https://github.com/pingcap/ticdc/pull/869) | ||
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| ## Improvements | ||
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| + TiDB | ||
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| - Replace error codes and messages with standard errors [#19888](https://github.com/pingcap/tidb/pull/19888) | ||
| - Improve the write performance of partitioned table [#19649](https://github.com/pingcap/tidb/pull/19649) | ||
| - Record more RPC runtime information in `Cop Runtime` statistics [#19264](https://github.com/pingcap/tidb/pull/19264) | ||
| - Forbid creating tables in `metrics_schema` and `performance_schema` [#19792](https://github.com/pingcap/tidb/pull/19792) | ||
| - Support adjusting the concurrency of the union executor [#19886](https://github.com/pingcap/tidb/pull/19886) | ||
| - Support out join in broadcast join [#19664](https://github.com/pingcap/tidb/pull/19664) | ||
| - Add SQL digest for the process list [#19829](https://github.com/pingcap/tidb/pull/19829) | ||
| - Switch to the pessimistic transaction mode for autocommit statement retry [#19796](https://github.com/pingcap/tidb/pull/19796) | ||
| - Support the `%r` and `%T` data format in `Str_to_date()` [#19693](https://github.com/pingcap/tidb/pull/19693) | ||
| - Enable `SELECT INTO OUTFILE` to require the file privilege [#19577](https://github.com/pingcap/tidb/pull/19577) | ||
| - Support the `stddev_pop` function [#19541](https://github.com/pingcap/tidb/pull/19541) | ||
| - Add the `TiDB-Runtime` dashboard [#19396](https://github.com/pingcap/tidb/pull/19396) | ||
| - Improve compatibility for the `ALTER TABLE` algorithms [#19364](https://github.com/pingcap/tidb/pull/19364) | ||
| - Encode `insert`/`delete`/`update` plans in the slow log `plan` field [#19269](https://github.com/pingcap/tidb/pull/19269) | ||
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| + TiKV | ||
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| - Reduce QPS drop when `DropTable` or `TruncateTable` is being executed [#8627](https://github.com/tikv/tikv/pull/8627) | ||
| - Support generating metafile of error codes [#8619](https://github.com/tikv/tikv/pull/8619) | ||
| - Add performance statistics for cf scan details [#8618](https://github.com/tikv/tikv/pull/8618) | ||
| - Add the `rocksdb perf context` panel in the Grafana default template [#8467](https://github.com/tikv/tikv/pull/8467) | ||
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| + PD | ||
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| - Update TiDB Dashboard to v2020.09.08.1 [#2928](https://github.com/pingcap/pd/pull/2928) | ||
| - Add more metrics for Region and store heartbeat [#2891](https://github.com/tikv/pd/pull/2891) | ||
| - Change back to the original way to control the low space threshold [#2875](https://github.com/pingcap/pd/pull/2875) | ||
| - Support standard error codes | ||
| - [#2918](https://github.com/tikv/pd/pull/2918) [#2911](https://github.com/tikv/pd/pull/2911) [#2913](https://github.com/tikv/pd/pull/2913) [#2915](https://github.com/tikv/pd/pull/2915) [#2912](https://github.com/tikv/pd/pull/2912) [#2907](https://github.com/tikv/pd/pull/2907) | ||
| - [#2906](https://github.com/tikv/pd/pull/2906) [#2903](https://github.com/tikv/pd/pull/2903) [#2806](https://github.com/tikv/pd/pull/2806) [#2900](https://github.com/tikv/pd/pull/2900) [#2902](https://github.com/tikv/pd/pull/2902) | ||
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| + TiFlash | ||
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| - Add Grafana panels for data replication (`apply Region snapshots` and `ingest SST files`) | ||
| - Add Grafana panels for `write stall` | ||
| - Add `dt_segment_force_merge_delta_rows` and `dt_segment_force_merge_delta_deletes` to adjust the threshold of `write stall` | ||
| - Support setting `raftstore.snap-handle-pool-size` to `0` in TiFlash-Proxy to disable applying Region snapshot by multi-thread to reduce memory consumption during data replication | ||
| - Support CN check on `https_port` and `metrics_port` | ||
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| + Tools | ||
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| + TiCDC | ||
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| - Skip resolved lock during puller initialization [#910](https://github.com/pingcap/ticdc/pull/910) | ||
| - Reduce PD write frequency [#937](https://github.com/pingcap/ticdc/pull/937) | ||
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| + Backup & Restore (BR) | ||
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| - Add real time cost in summary log [#486](https://github.com/pingcap/br/issues/486) | ||
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| + Dumpling | ||
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| - Support outputting `INSERT` with column names [#135](https://github.com/pingcap/dumpling/pull/135) | ||
| - Unify the `--filesize` and `--statement-size` definitions with those of mydumper [#142](https://github.com/pingcap/dumpling/pull/142) | ||
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| + TiDB Lightning | ||
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| - Split and ingest Regions in more precise sizes [#369](https://github.com/pingcap/tidb-lightning/pull/369) | ||
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| + TiDB Binlog | ||
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| - Support setting GC time in `go time` package format [#996](https://github.com/pingcap/tidb-binlog/pull/996) | ||
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| ## Bug Fixes | ||
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| + TiDB | ||
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| - Fix an issue of collecting the `tikv_cop_wait` time in metric profile [#19881](https://github.com/pingcap/tidb/pull/19881) | ||
| - Fix the wrong result of `SHOW GRANTS` [#19834](https://github.com/pingcap/tidb/pull/19834) | ||
| - Fix the incorrect query result of `!= ALL (subq)` [#19831](https://github.com/pingcap/tidb/pull/19831) | ||
| - Fix a bug of converting the `enum` and `set` types [#19778](https://github.com/pingcap/tidb/pull/19778) | ||
| - Add a privilege check for `SHOW STATS_META` and `SHOW STATS_BUCKET` [#19760](https://github.com/pingcap/tidb/pull/19760) | ||
| - Fix the error of unmatched column lengths caused by `builtinGreatestStringSig` and `builtinLeastStringSig` [#19758](https://github.com/pingcap/tidb/pull/19758) | ||
| - If unnecessary errors or warnings occur, the vectorized control expresions fall back to their scalar execution [#19749](https://github.com/pingcap/tidb/pull/19749) | ||
| - Fix an error of the `Apply` executor when the type of the correlation column is `Bit` [#19692](https://github.com/pingcap/tidb/pull/19692) | ||
| - Fix an issue that occurs when the user queries `processlist` and `cluster_log` in MySQL 8.0 client [#19690](https://github.com/pingcap/tidb/pull/19690) | ||
| - Fix an issue that plans of the same type have different plan digests [#19684](https://github.com/pingcap/tidb/pull/19684) | ||
| - Forbid changing the column type from `Decimal` to `Int` [#19682](https://github.com/pingcap/tidb/pull/19682) | ||
| - Fix an issue that `SELECT ... INTO OUTFILE` returns the runtime error [#19672](https://github.com/pingcap/tidb/pull/19672) | ||
| - Fix an incorrect implementation of `builtinRealIsFalseSig` [#19670](https://github.com/pingcap/tidb/pull/19670) | ||
| - Fix an issue that the partition expression check misses the parentheses expression [#19614](https://github.com/pingcap/tidb/pull/19614) | ||
| - Fix a query error when there is an `Apply` executor upon `HashJoin` [#19611](https://github.com/pingcap/tidb/pull/19611) | ||
| - Fix an incorrect result of vectorization that casts `Real` as `Time` [#19594](https://github.com/pingcap/tidb/pull/19594) | ||
| - Fix a bug that the `SHOW GRANTS` statement shows grants for non-existent users [#19588](https://github.com/pingcap/tidb/pull/19588) | ||
| - Fix a query error when there is an `Apply` executor upon `IndexLookupJoin` [#19566](https://github.com/pingcap/tidb/pull/19566) | ||
| - Fix the wrong results when converting `Apply` to `HashJoin` on a partitioned table [#19546](https://github.com/pingcap/tidb/pull/19546) | ||
| - Fix incorrect results when there is an `IndexLookUp` executor on the inner side of an `Apply` [#19508](https://github.com/pingcap/tidb/pull/19508) | ||
| - Fix an unexpected panic when using view [#19491](https://github.com/pingcap/tidb/pull/19491) | ||
| - Fix an incorrect result of the `anti-semi-join` query [#19477](https://github.com/pingcap/tidb/pull/19477) | ||
| - Fix a bug that the `TopN` statistics is not deleted when the statistics is dropped [#19465](https://github.com/pingcap/tidb/pull/19465) | ||
| - Fix a wrong result caused by mistaken usage of batch point get [#19460](https://github.com/pingcap/tidb/pull/19460) | ||
| - Fix a bug that a column cannot be found in `indexLookupJoin` with a virtual generated column [#19439](https://github.com/pingcap/tidb/pull/19439) | ||
| - Fix an error that different plans of the `select` and `update` queries compare datum [#19403](https://github.com/pingcap/tidb/pull/19403) | ||
| - Fix a data race for TiFlash work index in Region cache [#19362](https://github.com/pingcap/tidb/pull/19362) | ||
| - Fix a bug that the `logarithm` function does not show a warning [#19291](https://github.com/pingcap/tidb/pull/19291) | ||
| - Fix an unexpected error that occurs when TiDB persists data to disks [#19272](https://github.com/pingcap/tidb/pull/19272) | ||
| - Support using a single partitioned table on the inner side of index join [#19197](https://github.com/pingcap/tidb/pull/19197) | ||
| - Fix the wrong hash key value generated for decimal [#19188](https://github.com/pingcap/tidb/pull/19188) | ||
| - Fix an issue that TiDB returns a `no regions` error when table endKey and region endKey are the same [#19895](https://github.com/pingcap/tidb/pull/19895) | ||
| - Fix the unexpected success of alter partition [#19891](https://github.com/pingcap/tidb/pull/19891) | ||
| - Fix the wrong value of the default maximum packet length allowed for pushed down expressions [#19876](https://github.com/pingcap/tidb/pull/19876) | ||
| - Fix a wrong behavior for the `Max`/`Min` functions on the `ENUM`/`SET` columns [#19869](https://github.com/pingcap/tidb/pull/19869) | ||
| - Fix read failure from the `tiflash_segments` and `tiflash_tables` system tables when some TiFlash nodes are offline [#19748](https://github.com/pingcap/tidb/pull/19748) | ||
| - Fix a wrong result of the `Count(col)` aggregation function [#19628](https://github.com/pingcap/tidb/pull/19628) | ||
| - Fix a runtime error of the `TRUNCATE` operation [#19445](https://github.com/pingcap/tidb/pull/19445) | ||
| - Fix the issue that `PREPARE statement FROM @Var` will fail when `Var` contains uppercase characters [#19378](https://github.com/pingcap/tidb/pull/19378) | ||
| - Fix a bug that schema charset modification in an uppercase schema will cause panic [#19302](https://github.com/pingcap/tidb/pull/19302) | ||
| - Fix inconsistency of plans between `information_schema.statements_summary` and `explain`, when the information contains `tikv/tiflash` [#19159](https://github.com/pingcap/tidb/pull/19159) | ||
| - Fix the error in tests that the file does not exist for `select into outfile` [#19725](https://github.com/pingcap/tidb/pull/19725) | ||
| - Fix the issue that `INFORMATION_SCHEMA.CLUSTER_HARDWARE` does not have raid device information [#19457](https://github.com/pingcap/tidb/pull/19457) | ||
| - Make the `add index` operation that has a generated column with the `case-when` expression can exit normally when it encounters a parse error [#19395](https://github.com/pingcap/tidb/pull/19395) | ||
| - Fix a bug that DDL takes too long to retry [#19488](https://github.com/pingcap/tidb/pull/19488) | ||
| - Make statements like `alter table db.t1 add constraint fk foreign key (c2) references t2(c1)` execute without first executing `use db` [#19471](https://github.com/pingcap/tidb/pull/19471) | ||
| - Change the dispatch error from an `Error` to an `Info` message in the server log file [#19454](https://github.com/pingcap/tidb/pull/19454) | ||
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| + TiKV | ||
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| - Fix the estimation error for a non-index column when collation is enabled [#8620](https://github.com/tikv/tikv/pull/8620) | ||
| - Fix the issue that Green GC might miss locks during the process of Region transfer [#8460](https://github.com/tikv/tikv/pull/8460) | ||
| - Fix a panic issue that occurs when TiKV runs very slowly during Raft membership change [#8497](https://github.com/tikv/tikv/pull/8497) | ||
| - Fix the deadlock issue that occurs between the PD client thread and other threads when calling PD sync requests [#8612](https://github.com/tikv/tikv/pull/8612) | ||
| - Upgrade jemalloc to v5.2.1 to address the issue of memory allocation in huge page [#8463](https://github.com/tikv/tikv/pull/8463) | ||
| - Fix the issue that the unified thread pool hangs for long-running queries [#8427](https://github.com/tikv/tikv/pull/8427) | ||
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| + PD | ||
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| - Add the `initial-cluster-token` configuration to prevent different clusters from communicating with each other during bootstrap [#2922](https://github.com/pingcap/pd/pull/2922) | ||
| - Fix the unit of store limit rate when the mode is `auto` [#2826](https://github.com/pingcap/pd/pull/2826) | ||
| - Fix the issue that some schedulers persist configuration without solving errors [#2818](https://github.com/tikv/pd/pull/2818) | ||
| - Fix the empty HTTP response in scheduler [#2871](https://github.com/tikv/pd/pull/2871) [#2874](https://github.com/tikv/pd/pull/2874) | ||
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| + TiFlash | ||
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| - Fix the issue that after renaming the primary key column in previous versions, TiFlash might not start after upgrading to v4.0.4/v4.0.5 | ||
| - Fix the exceptions that occur after modifying the column's `nullable` attribute | ||
| - Fix the crash caused by computing a table's replication status | ||
| - Fix the issue that TiFlash is not available for data reads after users applied unsupported DDL operations | ||
| - Fix the exceptions caused by unsupported collations which are treated as `utf8mb4_bin` | ||
| - Fix the issue that the QPS panel for the TiFlash coprocessor executor always displays `0` in Grafana | ||
| - Fix the wrong result of the `FROM_UNIXTIME` function when input is `NULL` | ||
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| + Tools | ||
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| + TiCDC | ||
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| - Fix the issue that TiCDC leaks memory in some cases [#942](https://github.com/pingcap/ticdc/pull/942) | ||
| - Fix the issue that TiCDC might panic in Kafka sink [#912](https://github.com/pingcap/ticdc/pull/912) | ||
| - Fix the issue that CommitTs or ResolvedTs (CRTs) might be less than `resolvedTs` in puller [#927](https://github.com/pingcap/ticdc/pull/927) | ||
| - Fix the issue that `changefeed` might be blocked by MySQL driver [#936](https://github.com/pingcap/ticdc/pull/936) | ||
| - Fix the incorrect Resolved Ts interval of TiCDC [#8573](https://github.com/tikv/tikv/pull/8573) | ||
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| + BR | ||
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| - Fix a panic that might occur during checksum [#479](https://github.com/pingcap/br/pull/479) | ||
| - Fix a panic that might occur after the change of PD Leader [#496](https://github.com/pingcap/br/pull/496) | ||
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| + Dumpling | ||
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| - Fix the issue that the `NULL` value for the binary type is not handled properly [#137](https://github.com/pingcap/dumpling/pull/137) | ||
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| + TiDB Lightning | ||
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| - Fix the issue that all failed operations of writes and ingests are mistakenly displayed as successful [#381](https://github.com/pingcap/tidb-lightning/pull/381) | ||
| - Fix the issue that some checkpoint updates might not be written to the database before TiDB Lightning exits [#386](https://github.com/pingcap/tidb-lightning/pull/386) |
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