select_to_base causes strange routes

[llllllllll]

https://github.com/blaze/odo/blob/master/odo/backends/sql.py#L441

If I have a select whose dshape is int32 and do odo(select([col]), str) it will find the select_to_base edge for select -> str which will execute the select and return the result, even though the result is an int

[postelrich]

@llllllllll not sure if this is the same select_to_base you reference here: blaze/blaze#1464 but just posting the link instead of opening a dupe ticket.

[llllllllll]

I forgot that I made this issue, this is the same thing, thank you for linking them