Create fuse_statistic copy.md (#1668)

Author: soyeric128

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

@@ -0,0 +1,52 @@
+---
+title: FUSE_TIME_TRAVEL_SIZE
+---
+import FunctionDescription from '@site/src/components/FunctionDescription';
+
+<FunctionDescription description="Introduced or updated: v1.2.684"/>
+
+Calculates the storage size of historical data (for Time Travel) for tables.
+
+## Syntax
+
+```sql
+-- Calculate historical data size for all tables in all databases
+SELECT ...
+FROM fuse_time_travel_size();
+
+-- Calculate historical data size for all tables in a specified database
+SELECT ...
+FROM fuse_time_travel_size('<database_name>');
+
+-- Calculate historical data size for a specified table in a specified database
+SELECT ...
+FROM fuse_time_travel_size('<database_name>', '<table_name>'));
+```
+
+## Output
+
+The function returns a result set with the following columns:
+
+| Column                           | Description                                                                                           |
+|----------------------------------|-------------------------------------------------------------------------------------------------------|
+| `database_name`                  | The name of the database where the table is located.                                                  |
+| `table_name`                     | The name of the table.                                                                                |
+| `is_dropped`                     | Indicates whether the table has been dropped (`true` for dropped tables, `false` otherwise).          |
+| `time_travel_size`               | The total storage size of historical data (for Time Travel) for the table, in bytes.                  |
+| `latest_snapshot_size`           | The storage size of the latest snapshot of the table, in bytes.                                       |
+| `data_retention_period_in_hours` | The retention period for Time Travel data in hours (`NULL` means using the default retention policy). |
+| `error`                          | Any error encountered while retrieving the storage size (`NULL` if no errors occurred).               |
+
+## Examples
+
+This example calculates the historical data for all tables in the `default` database:
+
+```sql
+SELECT * FROM fuse_time_travel_size('default')
+
+┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
+│ database_name │ table_name │ is_dropped │ time_travel_size │ latest_snapshot_size │ data_retention_period_in_hours │       error      │
+├───────────────┼────────────┼────────────┼──────────────────┼──────────────────────┼────────────────────────────────┼──────────────────┤
+│ default       │ books      │ true       │             2810 │                 1490 │                           NULL │ NULL             │
+└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
+```