[Doc] Doc for shared-data tablet parallel Scan (#47458)

Signed-off-by: 絵空事スピリット <[email protected]>
(cherry picked from commit 17c2ede)

docs/en/reference/System_variable.md

@@ -484,6 +484,23 @@ Used to enable the strict mode when loading data using the INSERT statement. The
 * **Default**: false, which means the system selects a replica for each query.
 * **Introduced in**: v2.5.6, v3.0.8, v3.1.4, and v3.2.0.
 
+
+### enable_lake_tablet_internal_parallel
+
+* **Description**: Whether to enable Parallel Scan for Cloud-native tables in a shared-data cluster.
+* **Default**: false
+* **Data type**: Boolean
+* **Introduced in**: v3.3.0
+
+### tablet_internal_parallel_mode
+
+* **Description**: Internal Parallel Scan strategy of tablets. Valid Values:
+  * `auto`: When the number of Tablets to be scanned on BE or CN nodes is less than the Degree of Parallelism (DOP), the system automatically determines whether Parallel Scan is needed based on the estimated size of the Tablets.
+  * `force_split`: Forces the splitting of Tablets and performs Parallel Scan.
+* **Default**: auto
+* **Data type**: String
+* **Introduced in**: v2.5.0
+
 ### enable_scan_datacache
 
 * **Description**: Specifies whether to enable the Data Cache feature. After this feature is enabled, StarRocks caches hot data read from external storage systems into blocks, which accelerates queries and analysis. For more information, see [Data Cache](../data_source/data_cache.md). In versions prior to 3.2, this variable was named as `enable_scan_block_cache`.

docs/zh/reference/System_variable.md

@@ -479,6 +479,22 @@ SELECT /*+ SET_VAR
 * 类型：Boolean
 * 引入版本：v2.5.6、v3.0.8、v3.1.4、v3.2.0
 
+### enable_lake_tablet_internal_parallel
+
+* 描述：是否开启存算分离集群内云原生表的 Tablet 并行 Scan.
+* 默认值：false
+* 类型：Boolean
+* 引入版本：v3.3.0
+
+### tablet_internal_parallel_mode
+
+* 描述：Tablet 内部并行 Scan 策略。有效值:
+  * `auto`: 在 BE 或 CN 节点需要扫描的 Tablet 数小于 DOP 时，系统根据预估的 Tablet 大小自动判断是否需要并行 Scan。
+  * `force_split`: 强制对 Tablet 进行拆分和并行扫描。
+* 默认值：auto
+* 类型：String
+* 引入版本：v2.5.0
+
 ### enable_scan_datacache
 
 * 描述：是否开启 Data Cache 特性。该特性开启之后，StarRocks 通过将外部存储系统中的热数据缓存成多个 block，加速数据查询和分析。更多信息，参见 [Data Cache](../data_source/data_cache.md)。该特性从 2.5 版本开始支持。在 3.2 之前各版本中，对应变量为 `enable_scan_block_cache`。