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tidb: Remove warning about experimental feature for collecting predicate columns and update default value for tidb_enable_collect_predicate_columns #19495

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tidb: Remove warning about experimental feature for collecting predicate columns and update default value for tidb_enable_collect_predicate_columns #19495

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1 change: 1 addition & 0 deletions releases/release-8.3.0.md
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Expand Up @@ -212,6 +212,7 @@ TiDB 版本：8.3.0
|--------|------------------------------|------|
| [`tidb_ddl_reorg_batch_size`](/system-variables.md#tidb_ddl_reorg_batch_size) | 修改 | 增加 SESSION 作用域。 |
| [`tidb_ddl_reorg_worker_cnt`](/system-variables.md#tidb_ddl_reorg_worker_cnt) | 修改 | 增加 SESSION 作用域。 |
| [`tidb_enable_column_tracking`](/system-variables.md#tidb_enable_column_tracking-从-v540-版本开始引入) | 修改 | 经进一步的测试，默认值从 `OFF` 修改为 `ON`，即 TiDB 默认开启对 `PREDICATE COLUMNS` 的收集。|
| [`tidb_gc_concurrency`](/system-variables.md#tidb_gc_concurrency-从-v50-版本开始引入) | 修改 | 从 v8.3.0 起，该变量可以控制[垃圾回收 (GC)](/garbage-collection-overview.md) 过程中 [Resolve Locks（清理锁）](/garbage-collection-overview.md#resolve-locks清理锁)和 [Delete Range（删除区间）](/garbage-collection-overview.md#delete-ranges删除区间)的并发线程数。在 v8.3.0 之前，该变量只能控制 Resolve Locks（清理锁）的线程数。|
| [`tidb_low_resolution_tso`](/system-variables.md#tidb_low_resolution_tso) | 修改 | 增加 GLOBAL 作用域。|
| [`tidb_opt_projection_push_down`](/system-variables.md#tidb_opt_projection_push_down-从-v610-版本开始引入) | 修改 | 增加 GLOBAL 作用域，变量值可以持久化到集群。经进一步的测试，默认值从 `OFF` 修改为 `ON`，即默认允许优化器将 `Projection` 算子下推到 TiKV。|
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4 changes: 0 additions & 4 deletions statistics.md
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Expand Up @@ -169,10 +169,6 @@ ANALYZE TABLE TableName INDEX [IndexNameList] [WITH NUM BUCKETS|TOPN|CMSKETCH DE

- 当收集分区的统计信息时，如果只需要[收集部分列的统计信息](/statistics.md#收集部分列的统计信息)，请使用以下语法：

> **警告：**
>
> 收集 `PREDICATE COLUMNS` 的统计信息目前为实验特性，不建议在生产环境中使用。

```sql
ANALYZE TABLE TableName PARTITION PartitionNameList [COLUMNS ColumnNameList|PREDICATE COLUMNS|ALL COLUMNS] [WITH NUM BUCKETS|TOPN|CMSKETCH DEPTH|CMSKETCH WIDTH]|[WITH NUM SAMPLES|WITH FLOATNUM SAMPLERATE];
```
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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -1790,7 +1790,7 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
- 是否持久化到集群：是
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 类型：布尔型
- 默认值：`OFF`
- 默认值：`ON`，在 v8.3.0 之前，默认值为 `OFF`。
- 这个变量用于控制是否开启 TiDB 对 `PREDICATE COLUMNS` 的收集。关闭该变量后，之前收集的 `PREDICATE COLUMNS` 会被清除。详情见[收集部分列的统计信息](/statistics.md#收集部分列的统计信息)。

### `tidb_enable_ddl` <span class="version-mark">从 v6.3.0 版本开始引入</span>
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