Update query-metadata.md

Author: BohuTANG

docs/en/tutorials/load/query-metadata.md

@@ -34,6 +34,11 @@ PUT fs:///Users/eric/Documents/iris.parquet @my_internal_stage;
 ```
 
 ### Step 3: Query column definitions from the staged file
+:::caution
+
+`infer_schema` currently only supports parquet file format.
+
+:::
 
 ```sql
 SELECT * FROM INFER_SCHEMA(location => '@my_internal_stage/iris.parquet');
@@ -110,4 +115,4 @@ SELECT * FROM iris_with_meta LIMIT 5;
 │ iris.parquet     │                3 │               4.6 │               3.1 │               1.5 │               0.2 │ setosa           │
 │ iris.parquet     │                4 │                 5 │               3.6 │               1.4 │               0.2 │ setosa           │
 └────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
-```
+```