[hive] fix date casting in explore view (#3394)

superset/db_engine_specs.py

@@ -686,6 +686,16 @@ def fetch_result_sets(cls, db, datasource_type, force=False):
         return BaseEngineSpec.fetch_result_sets(
             db, datasource_type, force=force)
 
+    @classmethod
+    def convert_dttm(cls, target_type, dttm):
+        tt = target_type.upper()
+        if tt == 'DATE':
+            return "CAST('{}' AS DATE)".format(dttm.isoformat()[:10])
+        elif tt == 'TIMESTAMP':
+            return "CAST('{}' AS TIMESTAMP)".format(
+                dttm.strftime('%Y-%m-%d %H:%M:%S'))
+        return "'{}'".format(dttm.strftime('%Y-%m-%d %H:%M:%S'))
+
     @classmethod
     def adjust_database_uri(cls, uri, selected_schema=None):
         if selected_schema: