*: make the expressions of GlobalStats consistent (#18807)

optimizer-fix-controls.md

@@ -36,7 +36,7 @@ SET SESSION tidb_opt_fix_control = '44262:ON,44389:ON';
 
 - Default value: `OFF`
 - Possible values: `ON`, `OFF`
-- This variable controls whether to allow the use of [Dynamic pruning mode](/partitioned-table.md#dynamic-pruning-mode) to access the partitioned table when the [GlobalStats](/statistics.md#collect-statistics-of-partitioned-tables-in-dynamic-pruning-mode) are missing.
+- This variable controls whether to allow the use of [Dynamic pruning mode](/partitioned-table.md#dynamic-pruning-mode) to access a partitioned table when the [global statistics](/statistics.md#collect-statistics-of-partitioned-tables-in-dynamic-pruning-mode) of that table are missing.
 
 ### [`44389`](https://github.com/pingcap/tidb/issues/44389) <span class="version-mark">New in v6.5.3 and v7.2.0</span>
 

partitioned-table.md

@@ -1926,7 +1926,7 @@ select * from t;
 
 ### Dynamic pruning mode
 
-TiDB accesses partitioned tables in either `dynamic` or `static` mode. `dynamic` mode is used by default since v6.3.0. However, dynamic partitioning is effective only after the full table-level statistics, or GlobalStats, are collected. Before GlobalStats are collected, TiDB will use the `static` mode instead. For detailed information about GlobalStats, see [Collect statistics of partitioned tables in dynamic pruning mode](/statistics.md#collect-statistics-of-partitioned-tables-in-dynamic-pruning-mode).
+TiDB accesses partitioned tables in either `dynamic` or `static` mode. `dynamic` mode is used by default since v6.3.0. However, dynamic partitioning is effective only after the full table-level statistics, or global statistics, are collected. If you enable the `dynamic` pruning mode before global statistics collection is completed, TiDB remains in the `static` mode until global statistics are fully collected. For detailed information about global statistics, see [Collect statistics of partitioned tables in dynamic pruning mode](/statistics.md#collect-statistics-of-partitioned-tables-in-dynamic-pruning-mode).
 
 {{< copyable "sql" >}}
 
@@ -1936,9 +1936,9 @@ set @@session.tidb_partition_prune_mode = 'dynamic'
 
 Manual ANALYZE and normal queries use the session-level `tidb_partition_prune_mode` setting. The `auto-analyze` operation in the background uses the global `tidb_partition_prune_mode` setting.
 
-In `static` mode, partitioned tables use partition-level statistics. In `dynamic` mode, partitioned tables use table-level GlobalStats.
+In `static` mode, partitioned tables use partition-level statistics. In `dynamic` mode, partitioned tables use table-level global statistics.
 
-When switching from `static` mode to `dynamic` mode, you need to check and collect statistics manually. This is because after the switch to `dynamic` mode, partitioned tables have only partition-level statistics but no table-level statistics. GlobalStats are collected only upon the next `auto-analyze` operation.
+When switching from `static` mode to `dynamic` mode, you need to check and collect statistics manually. This is because after the switch to `dynamic` mode, partitioned tables have only partition-level statistics but no table-level statistics. Global statistics are collected only upon the next `auto-analyze` operation.
 
 {{< copyable "sql" >}}
 
@@ -1958,7 +1958,7 @@ show stats_meta where table_name like "t";
 3 rows in set (0.01 sec)
 ```
 
-To make sure that the statistics used by SQL statements are correct after you enable global `dynamic` pruning mode, you need to manually trigger `analyze` on the tables or on a partition of the table to obtain GlobalStats.
+To make sure that the statistics used by SQL statements are correct after you enable global `dynamic` pruning mode, you need to manually trigger `analyze` on the tables or on a partition of the table to obtain global statistics.
 
 {{< copyable "sql" >}}
 

releases/release-6.3.0.md

@@ -145,9 +145,9 @@ In v6.3.0-DMR, the key new features and improvements are as follows:
 
     You can [disable Titan](/storage-engine/titan-configuration.md#disable-titan) for online TiKV nodes.
 
-* Use `static` partition pruning when GlobalStats are not ready [#37535](https://github.com/pingcap/tidb/issues/37535) @[Yisaer](https://github.com/Yisaer)
+* Use `static` partition pruning when global statistics are not ready [#37535](https://github.com/pingcap/tidb/issues/37535) @[Yisaer](https://github.com/Yisaer)
 
-    When [`dynamic pruning`](/partitioned-table.md#dynamic-pruning-mode) is enabled, the optimizer selects execution plans based on [GlobalStats](/statistics.md#collect-statistics-of-partitioned-tables-in-dynamic-pruning-mode). Before GlobalStats are fully collected, using pseudo statistics might cause performance regression. In v6.3.0, this issue is addressed by maintaining the `static` mode if you enable dynamic pruning before GlobalStats are collected. TiDB remains in the `static` mode until GlobalStats are collected. This ensures performance stability when you change the partition pruning settings.
+    When [`dynamic pruning`](/partitioned-table.md#dynamic-pruning-mode) is enabled, the optimizer selects execution plans based on [global statistics](/statistics.md#collect-statistics-of-partitioned-tables-in-dynamic-pruning-mode). Before global statistics are fully collected, using pseudo statistics might cause performance regression. In v6.3.0, if you enable the `dynamic` pruning mode before global statistics collection is completed, TiDB remains in the `static` mode until global statistics are fully collected. This ensures performance stability when you change the partition pruning settings.
 
 ### Ease of use
 

releases/release-6.5.10.md

@@ -52,7 +52,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v6.5/quick-start-with-
     - Fix the issue that the `STATE` field in the `INFORMATION_SCHEMA.TIDB_TRX` table is empty due to the `size` of the `STATE` field not being defined [#53026](https://github.com/pingcap/tidb/issues/53026) @[cfzjywxk](https://github.com/cfzjywxk)
     - Fix the issue that TiDB does not create corresponding statistics metadata (`stats_meta`) when creating a table with foreign keys [#53652](https://github.com/pingcap/tidb/issues/53652) @[hawkingrei](https://github.com/hawkingrei)
     - Fix the issue that the statistics synchronous loading mechanism might fail unexpectedly under high query concurrency [#52294](https://github.com/pingcap/tidb/issues/52294) @[hawkingrei](https://github.com/hawkingrei)
-    - Fix the issue that the `Distinct_count` information in GlobalStats might be incorrect [#53752](https://github.com/pingcap/tidb/issues/53752) @[hawkingrei](https://github.com/hawkingrei)
+    - Fix the issue that the `Distinct_count` information in global statistics might be incorrect [#53752](https://github.com/pingcap/tidb/issues/53752) @[hawkingrei](https://github.com/hawkingrei)
     - Fix the issue that the histogram and TopN in the primary key column statistics are not loaded after restarting TiDB [#37548](https://github.com/pingcap/tidb/issues/37548) @[hawkingrei](https://github.com/hawkingrei)
     - Fix the issue that certain filter conditions in queries might cause the planner module to report an `invalid memory address or nil pointer dereference` error [#53582](https://github.com/pingcap/tidb/issues/53582) [#53580](https://github.com/pingcap/tidb/issues/53580) [#53594](https://github.com/pingcap/tidb/issues/53594) [#53603](https://github.com/pingcap/tidb/issues/53603) @[YangKeao](https://github.com/YangKeao)
     - Fix the issue that `PREPARE`/`EXECUTE` statements with the `CONV` expression containing a `?` argument might result in incorrect query results when executed multiple times [#53505](https://github.com/pingcap/tidb/issues/53505) @[qw4990](https://github.com/qw4990)

releases/release-7.3.0.md

@@ -182,7 +182,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v7.3/quick-start-with-
 | [`tidb_allow_tiflash_cop`](/system-variables.md#tidb_allow_tiflash_cop-new-in-v730) | Newly added | This system variable is used to select the protocol for generating execution plans when TiDB pushes computation tasks down to TiFlash. |
 | [`tidb_lock_unchanged_keys`](/system-variables.md#tidb_lock_unchanged_keys-new-in-v711-and-v730) | Newly added | This variable is used to control in certain scenarios whether to lock the keys that are involved but not modified in a transaction. |
 | [`tidb_opt_enable_non_eval_scalar_subquery`](/system-variables.md#tidb_opt_enable_non_eval_scalar_subquery-new-in-v730) | Newly added | Controls whether the `EXPLAIN` statement disables the execution of constant subqueries that can be expanded at the optimization stage.  |
-| [`tidb_skip_missing_partition_stats`](/system-variables.md#tidb_skip_missing_partition_stats-new-in-v730) | Newly added | This variable controls the generation of GlobalStats when partition statistics are missing. |
+| [`tidb_skip_missing_partition_stats`](/system-variables.md#tidb_skip_missing_partition_stats-new-in-v730) | Newly added | This variable controls the generation of global statistics when partition statistics are missing. |
 | [`tiflash_replica_read`](/system-variables.md#tiflash_replica_read-new-in-v730) | Newly added | Controls the strategy for selecting TiFlash replicas when a query requires the TiFlash engine. |
 
 ### Configuration file parameters

releases/release-7.5.0.md

@@ -213,7 +213,7 @@ Starting from v7.5.0, the following contents are removed from the `TiDB-communit
 
 + TiDB
 
-    - Optimize the concurrency model of merging GlobalStats: introduce [`tidb_enable_async_merge_global_stats`](/system-variables.md#tidb_enable_async_merge_global_stats-new-in-v750) to enable simultaneous loading and merging of statistics, which speeds up the generation of GlobalStats on partitioned tables. Optimize the memory usage of merging GlobalStats to avoid OOM and reduce memory allocations. [#47219](https://github.com/pingcap/tidb/issues/47219) @[hawkingrei](https://github.com/hawkingrei)
+    - Optimize the concurrency model of merging global statistics: introduce [`tidb_enable_async_merge_global_stats`](/system-variables.md#tidb_enable_async_merge_global_stats-new-in-v750) to enable simultaneous loading and merging of statistics, which speeds up the generation of global statistics on partitioned tables. Optimize the memory usage of merging global statistics to avoid OOM and reduce memory allocations. [#47219](https://github.com/pingcap/tidb/issues/47219) @[hawkingrei](https://github.com/hawkingrei)
     - Optimize the `ANALYZE` process: introduce [`tidb_build_sampling_stats_concurrency`](/system-variables.md#tidb_build_sampling_stats_concurrency-new-in-v750) to better control the `ANALYZE` concurrency to reduce resource consumption. Optimize the memory usage of `ANALYZE` to reduce memory allocation and avoid frequent GC by reusing some intermediate results. [#47275](https://github.com/pingcap/tidb/issues/47275) @[hawkingrei](https://github.com/hawkingrei)
     - Optimize the use of placement policies: support configuring the range of a policy to global and improve the syntax support for common scenarios. [#45384](https://github.com/pingcap/tidb/issues/45384) @[nolouch](https://github.com/nolouch)
     - Improve the performance of adding indexes with `tidb_ddl_enable_fast_reorg` enabled. In internal tests, v7.5.0 improves the performance by up to 62.5% compared with v6.5.0. [#47757](https://github.com/pingcap/tidb/issues/47757) @[tangenta](https://github.com/tangenta)

releases/release-8.1.1.md

@@ -75,7 +75,7 @@ In v8.1.1, `arbiter` is removed from the `TiDB-community-toolkit` [binary packag
     - Fix the issue that the `STATE` field in the `INFORMATION_SCHEMA.TIDB_TRX` table is empty due to the `size` of the `STATE` field not being defined [#53026](https://github.com/pingcap/tidb/issues/53026) @[cfzjywxk](https://github.com/cfzjywxk)
     - Fix the issue that executing the `SELECT DISTINCT CAST(col AS DECIMAL), CAST(col AS SIGNED) FROM ...` query might return incorrect results [#53726](https://github.com/pingcap/tidb/issues/53726) @[hawkingrei](https://github.com/hawkingrei)
     - Fix the issue that DDL statements incorrectly use etcd and cause tasks to queue up [#52335](https://github.com/pingcap/tidb/issues/52335) @[wjhuang2016](https://github.com/wjhuang2016)
-    - Fix the issue that the `Distinct_count` information in GlobalStats might be incorrect [#53752](https://github.com/pingcap/tidb/issues/53752) @[hawkingrei](https://github.com/hawkingrei)
+    - Fix the issue that the `Distinct_count` information in global statistics might be incorrect [#53752](https://github.com/pingcap/tidb/issues/53752) @[hawkingrei](https://github.com/hawkingrei)
     - Fix the issue that the `tidb_enable_async_merge_global_stats` and `tidb_analyze_partition_concurrency` system variables do not take effect during automatic statistics collection [#53972](https://github.com/pingcap/tidb/issues/53972) @[hi-rustin](https://github.com/hi-rustin)
     - Fix the issue that the `TIMESTAMPADD()` function goes into an infinite loop when the first argument is `month` and the second argument is negative [#54908](https://github.com/pingcap/tidb/issues/54908) @[xzhangxian1008](https://github.com/xzhangxian1008)
     - Fix the issue that the Connection Count monitoring metric in Grafana is incorrect when some connections exit before the handshake is complete [#54428](https://github.com/pingcap/tidb/issues/54428) @[YangKeao](https://github.com/YangKeao)

releases/release-8.2.0.md

@@ -302,7 +302,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.2/quick-start-with-
     - Fix the issue that certain filter conditions in queries might cause the planner module to report an `invalid memory address or nil pointer dereference` error [#53582](https://github.com/pingcap/tidb/issues/53582) [#53580](https://github.com/pingcap/tidb/issues/53580) [#53594](https://github.com/pingcap/tidb/issues/53594) [#53603](https://github.com/pingcap/tidb/issues/53603) @[YangKeao](https://github.com/YangKeao)
     - Fix the issue that executing `CREATE OR REPLACE VIEW` concurrently might result in the `table doesn't exist` error [#53673](https://github.com/pingcap/tidb/issues/53673) @[tangenta](https://github.com/tangenta)
     - Fix the issue that the `STATE` field in the `INFORMATION_SCHEMA.TIDB_TRX` table is empty due to the `size` of the `STATE` field not being defined [#53026](https://github.com/pingcap/tidb/issues/53026) @[cfzjywxk](https://github.com/cfzjywxk)
-    - Fix the issue that the `Distinct_count` information in GlobalStats might be incorrect when `tidb_enable_async_merge_global_stats` is disabled [#53752](https://github.com/pingcap/tidb/issues/53752) @[hawkingrei](https://github.com/hawkingrei)
+    - Fix the issue that the `Distinct_count` information in global statistics might be incorrect when `tidb_enable_async_merge_global_stats` is disabled [#53752](https://github.com/pingcap/tidb/issues/53752) @[hawkingrei](https://github.com/hawkingrei)
     - Fix the issue of incorrect WARNINGS information when using Optimizer Hints [#53767](https://github.com/pingcap/tidb/issues/53767) @[hawkingrei](https://github.com/hawkingrei)
     - Fix the issue that negating a time type results in an incorrect value [#52262](https://github.com/pingcap/tidb/issues/52262) @[solotzg](https://github.com/solotzg)
     - Fix the issue that `REGEXP()` does not explicitly report an error for empty pattern arguments [#53221](https://github.com/pingcap/tidb/issues/53221) @[yibin87](https://github.com/yibin87)

sql-statements/sql-statement-drop-stats.md

@@ -20,7 +20,7 @@ TableName ::=
 
 ## Usage
 
-The following statement deletes all statistics of `TableName`. If a partitioned table is specified, this statement deletes statistics of all partitions in this table as well as [GlobalStats generated in dynamic pruning mode](/statistics.md#collect-statistics-of-partitioned-tables-in-dynamic-pruning-mode).
+The following statement deletes all statistics of `TableName`. If a partitioned table is specified, this statement deletes statistics of all partitions in this table as well as [global statistics generated in dynamic pruning mode](/statistics.md#collect-statistics-of-partitioned-tables-in-dynamic-pruning-mode).
 
 ```sql
 DROP STATS TableName
@@ -40,7 +40,7 @@ DROP STATS TableName PARTITION PartitionNameList;
 Query OK, 0 rows affected (0.00 sec)
 ```
 
-The following statement only deletes GlobalStats generated in dynamic pruning mode of the specified table.
+The following statement only deletes global statistics generated in dynamic pruning mode of the specified table.
 
 ```sql
 DROP STATS TableName GLOBAL;