diff --git a/superset-frontend/src/explore/components/DataTablesPane/index.tsx b/superset-frontend/src/explore/components/DataTablesPane/index.tsx
index 3771c62655fb..55b11f9237d4 100644
--- a/superset-frontend/src/explore/components/DataTablesPane/index.tsx
+++ b/superset-frontend/src/explore/components/DataTablesPane/index.tsx
@@ -303,12 +303,12 @@ export const DataTablesPane = ({
   useEffect(() => {
     if (queriesResponse && chartStatus === 'success') {
       const { colnames } = queriesResponse[0];
-      setColumnNames({
-        ...columnNames,
+      setColumnNames(prevColumnNames => ({
+        ...prevColumnNames,
         [RESULT_TYPES.results]: colnames ? [...colnames] : [],
-      });
+      }));
     }
-  }, [queriesResponse]);
+  }, [queriesResponse, chartStatus]);
 
   useEffect(() => {
     if (panelOpen && isRequestPending[RESULT_TYPES.results]) {
diff --git a/superset/common/query_actions.py b/superset/common/query_actions.py
index 76ff5c767072..6ed18d195820 100644
--- a/superset/common/query_actions.py
+++ b/superset/common/query_actions.py
@@ -143,6 +143,8 @@ def _get_samples(
     query_obj.metrics = []
     query_obj.post_processing = []
     query_obj.columns = [o.column_name for o in datasource.columns]
+    query_obj.from_dttm = None
+    query_obj.to_dttm = None
     return _get_full(query_context, query_obj, force_cached)
 
 
diff --git a/superset/viz.py b/superset/viz.py
index 23f2cf336d8d..c1b506e25675 100644
--- a/superset/viz.py
+++ b/superset/viz.py
@@ -254,6 +254,8 @@ def get_samples(self) -> List[Dict[str, Any]]:
                 "orderby": [],
                 "row_limit": config["SAMPLES_ROW_LIMIT"],
                 "columns": [o.column_name for o in self.datasource.columns],
+                "from_dttm": None,
+                "to_dttm": None,
             }
         )
         df = self.get_df_payload(query_obj)["df"]  # leverage caching logic