together, with tables after the first being sql_gen.Join objects

    @param fields Use None to select all fields in the table

    @param conds WHERE conditions: [(compare_left_side, compare_right_side),...]

        * compare_left_side: Code|str (for col name)

        * compare_right_side: ValueCond|literal value

    @param distinct_on The columns to SELECT DISTINCT ON, or distinct_on_all to

    # Parse other params

    if conds == None: conds = []

    elif isinstance(conds, dict): conds = conds.items()

    assert limit == None or type(limit) == int

    assert start == None or type(start) == int

    if order_by is order_by_pkey: