Issue while adding views via sqlalchemy with autoload=True for Table class

[prathapreddy123]

Step1:Create an instance with table_name bieng a view in database
Table(table_name, meta,schema=schema or None,
autoload=True,autoload_with=self.get_sqla_engine())
Above statement makes a call to Table class located in sqlalchemy.sql.schema module

Step2: Since autoload = True, this will try to load the column definitions and makes call to
engine.run_callable() method with callabale as reflecttable method in corresponding dialect class (in this example in DefaultDialect). This will create an inspector instance binding the current sqlalchemy engine and make a reflecttable call on inspector instance.

Step3: reflecttable call is routed to a method of Inspector class in sqlalchemy.engine.reflection module. This method makes various call to get columns, constrainsts such as primarykey,foreignkey,uniquekey and CheckConstraints.

Issue: During call to dialects get_check_constraints() with a view name, inside get_check_constraints
self.get_table_oid() method is called which just checks only for table. In case of view it raises NoSuchTableError()

Possible Resolution:
1.Do not make call to get_table_oid() method
2.Change the Query to check on schemaname and tablename instead of objectid (Same as in other constraint methods)
SELECT constraint_name, column_name
FROM v_catalog.constraint_columns
WHERE lower(table_schema) = '%(schema)s'
AND lower(table_name) = '%(table)s'
AND constraint_type = 'c'