Add Cascades Planner to experimental-features (#10865) (#10869)

* This is an automated cherry-pick of #10865 Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io> * Apply suggestions from code review Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io> Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>
pingcap · Aug 12, 2022 · 2c224bd · 2c224bd
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diff --git a/experimental-features.md b/experimental-features.md
@@ -31,6 +31,7 @@ aliases: ['/zh/tidb/v5.0/experimental-features-4.0/']
 + [生成列](/generated-columns.md#生成列)。
 + [自定义变量](/user-defined-variables.md#用户自定义变量)。
 + [JSON 数据类型](/data-type-json.md) 及 [JSON 函数](/functions-and-operators/json-functions.md)。
++ [Cascades Planner](/system-variables.md#tidb_enable_cascades_planner)：基于 Cascades 框架的自顶向下查询优化器。（v3.0 实验特性）
 + [执行计划缓存](/sql-prepare-plan-cache.md)。（v4.0 实验特性）
 + [使用 `ALTER TABLE` 修改多个列或索引](/system-variables.md#tidb_enable_change_multi_schema)。（v5.0.0 实验特性）