feat: streaming support on reads

transport/sql/common.py

@@ -15,6 +15,7 @@ class Base:
         self._database = _args['database']
         self._table = _args['table'] if 'table' in _args else None
         self._engine= sqa.create_engine(self._get_uri(**_args),future=True)
+        self._chunksize = 0 if 'chunksize' not in _args else _args['chunksize']
     def _set_uri(self,**_args) :
         """
         :provider   provider
@@ -60,8 +61,10 @@ class Base:
         @TODO: Execution of stored procedures
         """
         if sql.lower().startswith('select') or sql.lower().startswith('with') :
-
-            return pd.read_sql(sql,self._engine) 
+            if self._chunksize :
+                return pd.read_sql(sql,self._engine,chunksize=self._chunksize)
+            else:
+                return pd.read_sql(sql,self._engine) 
         else:
             _handler = self._engine.connect()
             _handler.execute(text(sql))