I'm attempting to do a multi-table delete against PostgreSQL (psycopg2) with 
the following query:


    session.query(ProductionItem).\
        filter(Project.id == ProductionItem.project_id,

               Project.code.in_(projects),

               ProductionItem.external_id.is_(None)).\

    delete(synchronize_session=False)


But it produces incorrect SQL. PostgreSQL requires the following syntax for 
this query:


    DELETE FROM production_items USING projects WHERE 
production_items.project_id = project.id AND project.code IN (...) AND 
production_items.external_id IS NONE


Instead, I get this:


    DELETE FROM production_items WHERE production_items.project_id = project.id 
AND project.code IN (...) AND production_items.external_id IS NONE


At which point PG complains:


    sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) missing 
FROM-clause entry for table "projects"


>From initial research this seems like a missing feature. Would it be 
possible to add this to the postgresql dialect somehow? I might be willing 
to contribute the code in that case.

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