fix(db-engine-spec): execute oracle DML statement bug in sqllab

superset/db_engine_specs/oracle.py

@@ -15,7 +15,12 @@
 # specific language governing permissions and limitations
 # under the License.
 from datetime import datetime
-from typing import Optional
+from typing import (
+    Any,
+    List,
+    Optional,
+    Tuple
+)
 
 from superset.db_engine_specs.base import BaseEngineSpec, LimitMethod
 from superset.utils import core as utils
@@ -58,3 +63,16 @@ def epoch_to_dttm(cls) -> str:
     @classmethod
     def epoch_ms_to_dttm(cls) -> str:
         return "TO_DATE('1970-01-01','YYYY-MM-DD')+(1/24/60/60/1000)*{col}"
+
+    @classmethod
+    def fetch_data(
+        cls, cursor: Any, limit: Optional[int] = None
+    ) -> List[Tuple[Any, ...]]:
+        """
+        :param cursor: Cursor instance
+        :param limit: Maximum number of rows to be returned by the cursor
+        :return: Result of query
+        """
+        if not cursor.description:
+            return []
+        return super().fetch_data(cursor, limit)