Support For Multi-Row Inserts #670

    engine = sa.create_engine(
        "spanner+spanner:///...", 
    )

    with engine.begin() as conn:                                                                                                                                                                                                                                                
        conn.execute(
            sa.insert(Person)
            .values([{"name": "jdoe"}, {"name": "jmoe"}])
            .returning(Person.id)
        )
        session.commit()

sqlalchemy.exc.CompileError: The 'spanner+spanner' dialect with current database version settings does not support in-place multirow inserts.