SQLAlchemy URI for Presto Database with LDAP authentication

I would like to know what the SQLAlchemy URI is to connect to presto db with ldap authentication enabled.
I have tried :
````
engine = create_engine('presto://username:password@hostname:8443',connect_args={'auth':'LDAP'})
logs = Table('catalog.mytable', MetaData(bind=engine), autoload=True)
````
However I get a python stacktrace like this
````
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/schema.py", line 439, in __new__
metadata._remove_table(name, schema)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/schema.py", line 434, in __new__
table._init(name, metadata, *args, **kw)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/schema.py", line 514, in _init
include_columns, _extend_on=_extend_on)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/schema.py", line 540, in _autoload
_extend_on=_extend_on
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2045, in run_callable
return conn.run_callable(callable_, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1534, in run_callable
return callable_(self, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 372, in reflecttable
table, include_columns, exclude_columns, **opts)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py", line 598, in reflecttable
table_name, schema, **table.dialect_kwargs):
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/reflection.py", line 369, in get_columns
**kw)
File "/usr/local/lib/python2.7/dist-packages/pyhive/sqlalchemy_presto.py", line 143, in get_columns
rows = self._get_table_columns(connection, table_name, schema)
File "/usr/local/lib/python2.7/dist-packages/pyhive/sqlalchemy_presto.py", line 116, in _get_table_columns
return connection.execute('SHOW COLUMNS FROM {}'.format(full_table))
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 939, in execute
return self._execute_text(object, multiparams, params)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1097, in _execute_text
statement, parameters
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1121, in _execute_context
None, None)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1402, in _handle_dbapi_exception
exc_info
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1116, in _execute_context
context = constructor(dialect, self, conn, *args)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 699, in _init_statement
self.cursor = self.create_cursor()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 821, in create_cursor
return self._dbapi_connection.cursor()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 926, in cursor
return self.connection.cursor(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/pyhive/presto.py", line 67, in cursor
return Cursor(*self._args, **self._kwargs)
sqlalchemy.exc.StatementError: (exceptions.TypeError) __init__() got an unexpected keyword argument 'auth' [SQL: u'SHOW COLUMNS FROM "catalog.mytable"']
````
I have tried with 8080 port as well. It didn't help.

I just need the URI with the right parameters for connecting to presto using pyhive, if not sqlalchemy engine to an LDAP authentication based deployment of presto.