Hi,

I've a simple query as this : 

    def count_references(self, uri):
        sql = 'SELECT count(*) FROM (SELECT image.id, 
json_array_elements(image.uri_reference)::text as uri_ref FROM image) ss 
WHERE ss.uri_ref = \'\"{0}\"\''.format(uri)
        result = self.session.execute(text(sql))

I tested It on pgadmin and all works very good. and SQLAlchemy is throwing 
an error as : 

sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) relation 
"image" does not exist

LINE 1: ...ements(image.uri_reference)::text as uri_ref FROM image) ss ...

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