docs: add FUSE_TAG system function documentation

docs/cn/sql-reference/10-sql-commands/00-ddl/21-table-versioning/index.md

@@ -39,3 +39,4 @@ SET enable_experimental_table_ref = 1;
 |------|------|
 | [CREATE SNAPSHOT TAG](01-create-snapshot-tag.md) | 在表快照上创建命名标签 |
 | [DROP SNAPSHOT TAG](02-drop-snapshot-tag.md) | 删除快照标签 |
+| [FUSE_TAG](../../../20-sql-functions/16-system-functions/fuse_tag.md) | 列出表上所有快照标签 |

docs/cn/sql-reference/20-sql-functions/16-system-functions/fuse_tag.md

@@ -0,0 +1,53 @@
+---
+title: FUSE_TAG
+---
+
+import FunctionDescription from '@site/src/components/FunctionDescription';
+
+<FunctionDescription description="Introduced or updated: v1.2.894"/>
+
+import EEFeature from '@site/src/components/EEFeature';
+
+<EEFeature featureName='TABLE VERSIONING'/>
+
+返回表的快照标签信息。有关快照标签的更多信息，请参阅[快照标签](../../10-sql-commands/00-ddl/21-table-versioning/index.md#snapshot-tags)。
+
+## 语法
+
+```sql
+FUSE_TAG('<数据库名称>', '<表名称>')
+```
+
+## 输出列
+
+| 列名                | 类型               | 描述                                                                       |
+|---------------------|--------------------|----------------------------------------------------------------------------|
+| name                | STRING             | 标签名称                                                                    |
+| snapshot_location   | STRING             | 标签指向的快照文件                                                           |
+| expire_at           | TIMESTAMP (可为空)  | 过期时间戳；在 CREATE SNAPSHOT TAG 中使用 `RETAIN` 时设置                      |
+
+## 示例
+
+```sql
+SET enable_experimental_table_ref = 1;
+
+CREATE TABLE mytable(a INT, b INT);
+
+INSERT INTO mytable VALUES(1, 1),(2, 2);
+
+-- 创建快照标签
+ALTER TABLE mytable CREATE TAG v1;
+
+INSERT INTO mytable VALUES(3, 3);
+
+-- 创建带过期时间的标签
+ALTER TABLE mytable CREATE TAG temp RETAIN 2 DAYS;
+
+SELECT * FROM FUSE_TAG('default', 'mytable');
+
+---
+| name | snapshot_location                                          | expire_at                  |
+|------|------------------------------------------------------------|----------------------------|
+| v1   | 1/319/_ss/a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4_v4.mpk        | NULL                       |
+| temp | 1/319/_ss/f6e5d4c3b2a1f6e5d4c3b2a1f6e5d4c3_v4.mpk        | 2025-06-15 10:30:00.000000 |
+```

docs/cn/sql-reference/20-sql-functions/16-system-functions/index.md

@@ -18,6 +18,7 @@ title: 系统函数 (System Functions)
 | [FUSE_SEGMENT](fuse_segment.md) | 返回表的段信息 | `FUSE_SEGMENT('default', 'mytable')` |
 | [FUSE_BLOCK](fuse_block.md) | 返回表的块信息 | `FUSE_BLOCK('default', 'mytable')` |
 | [FUSE_COLUMN](fuse_column.md) | 返回表的列信息 | `FUSE_COLUMN('default', 'mytable')` |
+| [FUSE_TAG](fuse_tag.md) | 返回表的快照标签信息 | `FUSE_TAG('default', 'mytable')` |
 
 ## 存储优化函数
 

docs/en/sql-reference/10-sql-commands/00-ddl/21-table-versioning/index.md

@@ -39,3 +39,4 @@ A snapshot tag attaches a human-readable name to a snapshot. As long as the tag
 |---------|-------------|
 | [CREATE SNAPSHOT TAG](01-create-snapshot-tag.md) | Create a named tag on a table snapshot |
 | [DROP SNAPSHOT TAG](02-drop-snapshot-tag.md) | Remove a snapshot tag |
+| [FUSE_TAG](../../../20-sql-functions/16-system-functions/fuse_tag.md) | List all snapshot tags on a table |

docs/en/sql-reference/20-sql-functions/16-system-functions/fuse_tag.md

@@ -0,0 +1,53 @@
+---
+title: FUSE_TAG
+---
+
+import FunctionDescription from '@site/src/components/FunctionDescription';
+
+<FunctionDescription description="Introduced or updated: v1.2.894"/>
+
+import EEFeature from '@site/src/components/EEFeature';
+
+<EEFeature featureName='TABLE VERSIONING'/>
+
+Returns the snapshot tags of a table. For more information about snapshot tags, see [Snapshot Tags](../../10-sql-commands/00-ddl/21-table-versioning/index.md#snapshot-tags).
+
+## Syntax
+
+```sql
+FUSE_TAG('<database_name>', '<table_name>')
+```
+
+## Output Columns
+
+| Column              | Type               | Description                                                                 |
+|---------------------|--------------------|-----------------------------------------------------------------------------|
+| name                | STRING             | Tag name                                                                    |
+| snapshot_location   | STRING             | Snapshot file the tag points to                                             |
+| expire_at           | TIMESTAMP (nullable) | Expiration timestamp; set when `RETAIN` is used in CREATE SNAPSHOT TAG    |
+
+## Examples
+
+```sql
+SET enable_experimental_table_ref = 1;
+
+CREATE TABLE mytable(a INT, b INT);
+
+INSERT INTO mytable VALUES(1, 1),(2, 2);
+
+-- Create a snapshot tag
+ALTER TABLE mytable CREATE TAG v1;
+
+INSERT INTO mytable VALUES(3, 3);
+
+-- Create another tag with expiration
+ALTER TABLE mytable CREATE TAG temp RETAIN 2 DAYS;
+
+SELECT * FROM FUSE_TAG('default', 'mytable');
+
+---
+| name | snapshot_location                                          | expire_at                  |
+|------|------------------------------------------------------------|----------------------------|
+| v1   | 1/319/_ss/a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4_v4.mpk        | NULL                       |
+| temp | 1/319/_ss/f6e5d4c3b2a1f6e5d4c3b2a1f6e5d4c3_v4.mpk        | 2025-06-15 10:30:00.000000 |
+```

docs/en/sql-reference/20-sql-functions/16-system-functions/index.md

@@ -18,6 +18,7 @@ This page provides reference information for the system-related functions in Dat
 | [FUSE_SEGMENT](fuse_segment.md) | Returns segment information of a table | `FUSE_SEGMENT('default', 'mytable')` |
 | [FUSE_BLOCK](fuse_block.md) | Returns block information of a table | `FUSE_BLOCK('default', 'mytable')` |
 | [FUSE_COLUMN](fuse_column.md) | Returns column information of a table | `FUSE_COLUMN('default', 'mytable')` |
+| [FUSE_TAG](fuse_tag.md) | Returns snapshot tag information of a table | `FUSE_TAG('default', 'mytable')` |
 
 ## Storage Optimization Functions