docs: add unassign warehouse nodes sql reference (#3164)

Author: sundy-li

docs/cn/sql-reference/10-sql-commands/00-ddl/19-warehouse/index.md

@@ -21,6 +21,7 @@ Databend Cloud 计算集群相关的 SQL 命令。
 | [USE WAREHOUSE](use-warehouse.md) | 切换当前会话的计算集群 |
 | [SHOW WAREHOUSES](show-warehouses.md) | 查看计算集群列表 |
 | [ALTER WAREHOUSE ... ASSIGN NODES](assign-warehouse-nodes.md) | 为计算集群中的 cluster 分配节点 |
+| [ALTER WAREHOUSE ... UNASSIGN NODES](unassign-warehouse-nodes.md) | 从计算集群的 cluster 中移除已分配节点 |
 | [ALTER WAREHOUSE](alter-warehouse.md) | 暂停、恢复或修改计算集群配置 |
 | [DROP WAREHOUSE](drop-warehouse.md) | 删除计算集群 |
 | [REPLACE WAREHOUSE](replace-warehouse.md) | 重建计算集群 |

docs/cn/sql-reference/10-sql-commands/00-ddl/19-warehouse/unassign-warehouse-nodes.md

@@ -0,0 +1,39 @@
+---
+title: ALTER WAREHOUSE UNASSIGN NODES
+sidebar_position: 7
+---
+
+从某个计算集群中的一个或多个 cluster 移除已分配节点。
+
+:::note
+此命令依赖 system management 功能，并需要企业版许可证。
+:::
+
+## 语法
+
+```sql
+ALTER WAREHOUSE <warehouse_name> UNASSIGN NODES
+(
+    UNASSIGN <node_count> NODES [ FROM '<node_group>' ] FOR <cluster_name>
+    [ , UNASSIGN <node_count> NODES [ FROM '<node_group>' ] FOR <cluster_name> , ... ]
+)
+```
+
+## 参数
+
+| 参数 | 说明 |
+|-----------|-------------|
+| `<warehouse_name>` | 目标计算集群。 |
+| `<node_count>` | 要移除的节点数量。 |
+| `FROM '<node_group>'` | 可选的节点组选择器。 |
+| `<cluster_name>` | 计算集群内部的目标 cluster。 |
+
+## 示例
+
+```sql
+ALTER WAREHOUSE etl_wh UNASSIGN NODES
+(
+    UNASSIGN 1 NODES FOR c1,
+    UNASSIGN 1 NODES FROM 'default' FOR c2
+);
+```

docs/en/sql-reference/10-sql-commands/00-ddl/19-warehouse/index.md

@@ -56,6 +56,7 @@ Tags are returned in API responses and visible through `SHOW WAREHOUSES`.
 | [USE WAREHOUSE](use-warehouse.md)       | Sets the current warehouse for the session        |
 | [SHOW WAREHOUSES](show-warehouses.md)   | Lists all warehouses with optional filtering      |
 | [ALTER WAREHOUSE ... ASSIGN NODES](assign-warehouse-nodes.md) | Assigns nodes to warehouse clusters |
+| [ALTER WAREHOUSE ... UNASSIGN NODES](unassign-warehouse-nodes.md) | Removes assigned nodes from warehouse clusters |
 | [ALTER WAREHOUSE](alter-warehouse.md)   | Suspends, resumes, or modifies warehouse settings |
 | [DROP WAREHOUSE](drop-warehouse.md)     | Removes a warehouse                               |
 | [QUERY_HISTORY](query-history.md)       | Inspects query logs for a warehouse               |

docs/en/sql-reference/10-sql-commands/00-ddl/19-warehouse/unassign-warehouse-nodes.md

@@ -0,0 +1,39 @@
+---
+title: ALTER WAREHOUSE UNASSIGN NODES
+sidebar_position: 7
+---
+
+Removes assigned nodes from one or more clusters in a warehouse.
+
+:::note
+This command requires system management support and an enterprise license.
+:::
+
+## Syntax
+
+```sql
+ALTER WAREHOUSE <warehouse_name> UNASSIGN NODES
+(
+    UNASSIGN <node_count> NODES [ FROM '<node_group>' ] FOR <cluster_name>
+    [ , UNASSIGN <node_count> NODES [ FROM '<node_group>' ] FOR <cluster_name> , ... ]
+)
+```
+
+## Parameters
+
+| Parameter | Description |
+|-----------|-------------|
+| `<warehouse_name>` | The target warehouse. |
+| `<node_count>` | Number of nodes to remove. |
+| `FROM '<node_group>'` | Optional node group selector. |
+| `<cluster_name>` | The target cluster inside the warehouse. |
+
+## Example
+
+```sql
+ALTER WAREHOUSE etl_wh UNASSIGN NODES
+(
+    UNASSIGN 1 NODES FOR c1,
+    UNASSIGN 1 NODES FROM 'default' FOR c2
+);
+```