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

docs/en/reference/System_variable.md

@@ -296,6 +296,27 @@ This variable is supported from v2.5.18 and v3.1.7.
 
   Default value: `false`, which means the system selects a replica for each query. This feature is supported since 2.5.6, 3.0.8, and 3.1.4.
 
+### 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`.
+* **Default**: false
+* **Introduced in**: v2.5
+
+### enable_populate_datacache
+
+* **Description**: Specifies whether to cache data blocks read from external storage systems in StarRocks. If you do not want to cache data blocks read from external storage systems, set this variable to `false`. Default value: true. This variable is supported from 2.5. In versions prior to 3.2, this variable was named as `enable_scan_block_cache`.
+* **Default**: true
+* **Introduced in**: v2.5
+
 ### enable_global_runtime_filter
 
   Whether to enable global runtime filter (RF for short). RF filters data at runtime. Data filtering often occurs in the Join stage. During multi-table joins, optimizations such as predicate pushdown are used to filter data, in order to reduce the number of scanned rows for Join and the I/O in the Shuffle stage, thereby speeding up the query.

docs/zh/reference/System_variable.md

@@ -251,7 +251,27 @@ group-by-count-distinct 查询中为 count distinct 列设置的分桶数。该
 
 如果待查询的表中存在大量 tablet，开启该特性会对性能有提升，因为会更快的将 tablet 的元信息以及数据缓存在内存中。但是，如果查询存在一些热点 tablet，开启该特性可能会导致性能有所退化，因为该特性倾向于将一个热点 tablet 的查询调度到相同的 BE 上，在高并发的场景下无法充分利用多台 BE 的资源。
 
+<<<<<<< HEAD
 默认值：`false`，表示使用原来的机制，即每次查询会从多个副本中选择一个。自 2.5.6、3.0.8、3.1.4 版本起，StarRocks 支持该参数。
+=======
+### 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
+>>>>>>> 17c2eded73 ([Doc] Doc for shared-data tablet parallel Scan (#47458))
 
 ### enable_scan_block_cache（2.5 及以后）