modify notes except Tools

releases/release-4.0.14.md

@@ -13,8 +13,8 @@ TiDB version: 4.0.14
 + TiDB
 
     - Change the default value of `tidb_multi_statement_mode` from `WARN` to `OFF` in v4.0. It is recommended to use the multi-statement feature of your client library instead. See [the documentation on `tidb_multi_statement_mode`](/system-variables.md#tidb_multi_statement_mode-new-in-v4011) for details. [#25749](https://github.com/pingcap/tidb/pull/25749)
-    - Upgrade Grafana dashboard from v6.1.16 to v7.5.7 to solve two security vulnerabilities. See the [Grafana post](https://grafana.com/blog/2020/06/03/grafana-6.7.4-and-7.0.2-released-with-important-security-fix/) for details.
-    - Enlarge the variable `tidb_stmt_summary_max_stmt_count` default value from 200 to 3000 [#25872](https://github.com/pingcap/tidb/pull/25872)
+    - Upgrade Grafana dashboard from v6.1.16 to v7.5.7 to solve two security vulnerabilities. See the [Grafana blog post](https://grafana.com/blog/2020/06/03/grafana-6.7.4-and-7.0.2-released-with-important-security-fix/) for details.
+    - Change the default value of the `tidb_stmt_summary_max_stmt_count` variable from `200` to `3000` [#25872](https://github.com/pingcap/tidb/pull/25872)
 
 + TiKV
 
@@ -29,18 +29,18 @@ TiDB version: 4.0.14
 
 + TiDB Dashboard
 
-    - Add OIDC SSO support. Users can sign into TiDB Dashboard without entering the SQL password by using OIDC SSO services (like Okta, Auth0, etc). [#960](https://github.com/pingcap/tidb-dashboard/pull/960)
-    - Add Debug API UI, which can be used to invoke several common TiDB and PD internal APIs for advanced debugging. [#927](https://github.com/pingcap/tidb-dashboard/pull/927)
+    - Support OIDC SSO. By setting the OIDC-compatible SSO services (such as Okta and Auth0), users can log into TiDB Dashboard without entering the SQL password. [#960](https://github.com/pingcap/tidb-dashboard/pull/960)
+    - Add the **Debug API** UI, which is an alternative method to the command line to call several common TiDB and PD internal APIs for advanced debugging. [#927](https://github.com/pingcap/tidb-dashboard/pull/927)
 
 ## Improvements
 
 + TiDB
 
-    - Change the lock record into put record for the index keys using point/batch point get for update read. [#26223](https://github.com/pingcap/tidb/pull/26223)
-    - Support the MySQL system variable `init_connect` and associated functionality. [#26031](https://github.com/pingcap/tidb/pull/26031)
-    - Support stable result mode [#26003](https://github.com/pingcap/tidb/pull/26003)
-    - Enable the pushdown of builtin function `json_unquote()` to TiKV. [#25721](https://github.com/pingcap/tidb/pull/25721)
-    - Make SPM not be affected by charset [#23295](https://github.com/pingcap/tidb/pull/23295)
+    ?- Change the lock records into put record for the index keys using `point get` or `batch point get` for `UPDATE` reads [#26223](https://github.com/pingcap/tidb/pull/26223)
+    - Support the MySQL system variable `init_connect` and its associated features [#26031](https://github.com/pingcap/tidb/pull/26031)
+    - Support the stable result mode to make the query results more stable [#26003](https://github.com/pingcap/tidb/pull/26003)
+    - Support pushing down the built-in function `json_unquote()` to TiKV [#25721](https://github.com/pingcap/tidb/pull/25721)
+    - Make the SQL Plan Management (SPM) not affected by the character set [#23295](https://github.com/pingcap/tidb/pull/23295)
 
 + TiKV
 
@@ -51,13 +51,12 @@ TiDB version: 4.0.14
 
 + PD
 
-    - Update TiDB Dashboard to v2021.07.17.1 [#3882](https://github.com/pingcap/pd/pull/3882)
-    - Reduce the conflict due to multiple schedulers running at the same time [#3858](https://github.com/pingcap/pd/pull/3858) [#3854](https://github.com/tikv/pd/pull/3854)
-    - Fix the issue that leader re-election is slow when there are many stores [#3718](https://github.com/pingcap/pd/pull/3718)
+    - Reduce the conflicts among multiple schedulers that run at the same time [#3858](https://github.com/pingcap/pd/pull/3858) [#3854](https://github.com/tikv/pd/pull/3854)
 
 + TiDB Dashboard
 
-    - Support sharing session as read-only to avoid further modifications [#960](https://github.com/pingcap/tidb-dashboard/pull/960)
+    - Update TiDB Dashboard to v2021.07.17.1 [#3882](https://github.com/pingcap/pd/pull/3882)
+    - Support sharing the current session as a read-only session to avoid further modification to it [#960](https://github.com/pingcap/tidb-dashboard/pull/960)
 
 + Tools
 
@@ -80,59 +79,60 @@ TiDB version: 4.0.14
 
 + TiDB
 
-    - Generate a correct number of rows when all agg funcs are pruned [#26039](https://github.com/pingcap/tidb/pull/26039)
-    - Fix ifnull bug when arg is enum/set [#26035](https://github.com/pingcap/tidb/pull/26035)
-    - Fix wrong aggregate pruning for some cases [#26033](https://github.com/pingcap/tidb/pull/26033)
-    - Fix incorrect result of set type for merge join [#26032](https://github.com/pingcap/tidb/pull/26032)
-    - Fix IN expr critical bug [#25665](https://github.com/pingcap/tidb/pull/25665)
-    - Fix panic when 'select ... for update' works on a join operation and the join uses partition table [#25501](https://github.com/pingcap/tidb/pull/25501)
-    - Fix the issue point get cached plan of a prepared statement is incorrectly used by in transaction point get statement. [#24764](https://github.com/pingcap/tidb/pull/24764)
-    - Fix load data with non-utf8 can succeed [#26142](https://github.com/pingcap/tidb/pull/26142)
-    - Fix a potential statistic object's memory leak when HTTP api is used [#24650](https://github.com/pingcap/tidb/pull/24650)
-    - Fix the security issue for handling ALTER USER statements [#25347](https://github.com/pingcap/tidb/pull/25347)
+    - Fix the issue that the `SELECT` result is incompatible with MySQL when joining a subquery with a `WHERE` clause evaluated to `false` [#24865](https://github.com/pingcap/tidb/issues/24865)
+    - Fix the calculation error of the `ifnull` function that occurs when the argument is the `ENUM` or `SET` type [#24944](https://github.com/pingcap/tidb/issues/24944)
+    - Fix the wrong aggregate pruning in some cases [#26033](https://github.com/pingcap/tidb/pull/26033)
+    - Fix the incorrect result of the merge join operation that might occur when the column is the `SET` type [#26032](https://github.com/pingcap/tidb/pull/26032)
+    - Fix the issue that TiDB returns wrong results for cartesian join [#25665](https://github.com/pingcap/tidb/pull/25665)
+    - Fix the panic issue that occurs when `SELECT ... FOR UPDATE` works on a join operation and the join uses a partitioned table [#25501](https://github.com/pingcap/tidb/pull/25501)
+    - Fix the issue that the cached `prepared` plan is incorrectly used for `point get` [#24764](https://github.com/pingcap/tidb/pull/24764)
+    - Fix the issue that the `LOAD DATA` statement can abnormally import non-utf8 data [#26142](https://github.com/pingcap/tidb/pull/26142)
+    - Fix a potential memory leak issue that occurs when accessing the statistics via an HTTP API [#24650](https://github.com/pingcap/tidb/pull/24650)
+    - Fix a security issue that occurs when executing the `ALTER USER` statement [#25347](https://github.com/pingcap/tidb/pull/25347)
     - Fix the bug that `TIKV_REGION_PEERS` table did not have the correct `DOWN` status. [#24918](https://github.com/pingcap/tidb/pull/24918)
-    - Fix parsing DateTime not truncate the reluctant string. [#22260](https://github.com/pingcap/tidb/pull/22260)
-    - Fix `select into outfile` have no data with year column type [#22185](https://github.com/pingcap/tidb/pull/22185)
+    - Fix the issue that invalid strings are not truncated when parsing `DateTime` [#22260](https://github.com/pingcap/tidb/pull/22260)
+    - Fix the issue that the `select into outfile` statement might have no result when the column type is `YEAR` [#22185](https://github.com/pingcap/tidb/pull/22185)
 
 + TiKV
 
-    - Fix duration calculation panics on certain platforms [#10572](https://github.com/tikv/tikv/pull/10572)
-    - Fix wrong function cast double to double [#10532](https://github.com/tikv/tikv/pull/10532)
-    - Ensure panic output is flushed to the log [#10488](https://github.com/tikv/tikv/pull/10488)
-    - Avoid panic when building a snapshot twice if encryption enabled [#10462](https://github.com/tikv/tikv/pull/10462)
-    - Copr: fix the wrong arguments type of json_unquote [#10425](https://github.com/tikv/tikv/pull/10425)
-    - skip clearing callback during gracefully shutdown to avoid breaking ACID in some cases [#10395](https://github.com/tikv/tikv/pull/10395)
-    - Fix backup threads leak [#10360](https://github.com/tikv/tikv/pull/10360)
-    - Fix an issue that split may panic and corrupt the metadata if the split process is too slow and region merge is open. [#9584](https://github.com/tikv/tikv/pull/9584)
-    - Fix region heartbeat preventing from TiKV splitting large regions [#10274](https://github.com/tikv/tikv/pull/10274)
-    - Fix wrong statistics due to format inconsistency of CM Sketch between TiKV and TiDB [#10433](https://github.com/tikv/tikv/pull/10433)
-    - Fix wrong apply wait duration metrics [#9966](https://github.com/tikv/tikv/pull/9966)
-    - Fix "Missing Blob" error after using delete_files_in_range with titan [#10232](https://github.com/tikv/tikv/pull/10232)
+    - Fix the issue that the duration calculation might panic on certain platforms [#10572](https://github.com/tikv/tikv/pull/10572)
+    - Fix the wrong function that casts `DOUBLE` to `DOUBLE` [#25200](https://github.com/pingcap/tidb/issues/25200)
+    - Fix the issue that the panic log might be lost when using the async logger [#8998](https://github.com/tikv/tikv/issues/8998)
+    - Fix the panic issue that occurs when building a snapshot twice if encryption is enabled [#10462](https://github.com/tikv/tikv/pull/10462)
+    - Fix the wrong arguments type of the `json_unquote()` function in the coprocessor [#10176](https://github.com/tikv/tikv/issues/10176)
+    - Fix the issues of suspicious warnings during shutdown and the non-deterministic response from Raftstore [#10395](https://github.com/tikv/tikv/pull/10395)
+    - Fix the issue of backup threads leak [#10360](https://github.com/tikv/tikv/pull/10360)
+    - Fix the issue that Region split might panic and corrupt the metadata if the split process is too slow and Region merge is on-going [#9584](https://github.com/tikv/tikv/pull/9584)
+    - Fix the issue that the Region heartbeats prevent TiKV from splitting large Regions in some situation [#10274](https://github.com/tikv/tikv/pull/10274)
+    - Fix the wrong statistics caused by the format inconsistency of CM Sketch between TiKV and TiDB [#10433](https://github.com/tikv/tikv/pull/10433)
+    - Fix the wrong statistics of the `apply wait duration` metric [#9966](https://github.com/tikv/tikv/pull/9966)
+    - Fix the "Missing Blob" error after using `delete_files_in_range` in Titan [#10232](https://github.com/tikv/tikv/pull/10232)
 
 + PD
 
-    - Fix the bug that the scheduler may reappear after executing the delete operation [#3825](https://github.com/pingcap/pd/pull/3825)
-    - Fix the data race when the scheduler is started before loading TTL config [#3773](https://github.com/pingcap/pd/pull/3773)
-    - Fix the bug that PD may panic during the scattering region [#3761](https://github.com/pingcap/pd/pull/3761)
+    - Fix a bug that the scheduler might reappear after executing the delete operation [#3825](https://github.com/pingcap/pd/pull/3825)
+    - Fix the data race issue that might occur when the scheduler is started before the temporary configuration is loaded [#3773](https://github.com/pingcap/pd/pull/3773)
+    - Fix a PD panic issue that might occur during the Region scattering operation [#3761](https://github.com/pingcap/pd/pull/3761)
     - Fix the issue that the priority of some operators is not set correctly [#3703](https://github.com/pingcap/pd/pull/3703)
-    - Fix the bug that PD may panic when deleting the evict leader scheduler from a non-existent store. [#3680](https://github.com/pingcap/pd/pull/3680)
+    - Fix a PD panic issue that might occur when deleting the `evict-leader` scheduler from a non-existent store [#3680](https://github.com/pingcap/pd/pull/3680)
+    - Fix the issue that the PD Leader re-election is slow when there are many stores [#3697](https://github.com/tikv/pd/issues/3697)
 
 + TiDB Dashboard
 
-    - Fix profiling UI cannot profile all TiDB instances [#944](https://github.com/pingcap/tidb-dashboard/pull/944)
-    - Fix statement UI does not display "# Plans" [#939](https://github.com/pingcap/tidb-dashboard/pull/939)
-    - Fix slow query UI displays "unknown field" error after cluster upgrade [#930](https://github.com/pingcap/tidb-dashboard/pull/930)
+    - Fix the issue that the **Profiling** UI cannot profile all TiDB instances [#944](https://github.com/pingcap/tidb-dashboard/pull/944)
+    - Fix the issue that the **Statements** UI does not display "Plan Count" [#939](https://github.com/pingcap/tidb-dashboard/pull/939)
+    - Fix the issue that the **Slow Query** UI might display the "unknown field" error after cluster upgrade [#930](https://github.com/pingcap/tidb-dashboard/pull/930)
 
 + TiFlash
 
-    - Fix the potential panic issue that occurs while compiling DAG requests
-    - Fix the panic issue that occurs when read load is heavy
-    - Fix the issue that TiFlash keeps restarting because of split failure in column storage
-    - Fix a potential bug that TiFlash can not GC delta data
-    - Fix the issue of incorrect results when cloning shared delta index concurrently
-    - Fix a bug that TiFlash fails to restart because of incomplete data
-    - Fix the issue that old dm files are not removed automatically
-    - Fix the panic issue that occurs while executing `SUBSTRING` function with specific arguments
+    - Fix the potential panic issue that occurs when compiling DAG requests
+    - Fix the panic issue that occurs when the read load is heavy
+    - Fix the issue that TiFlash keeps restarting because of the split failure in column storage
+    - Fix a potential bug that TiFlash cannot delete the delta data
+    - Fix the incorrect results that occur when cloning the shared delta index concurrently
+    - Fix a bug that TiFlash fails to restart in the case of incomplete data
+    - Fix the issue that the old dm files cannot be removed automatically
+    - Fix the panic issue that occurs when executing the `SUBSTRING` function with specific arguments
     - Fix the issue of incorrect results when casting the `INTEGER` type to the `TIME` type
 
 + Tools