Which row do you want ? Do you want 'a row' at random ?
I presume you want the N latest rows ?
In that case you should use an ORDER BY on an indexed field, the serial
primary key will do nicely (ORDER BY id DESC) ; it's indexed so it will
use the index and it will fly.
> Any ideas how to make it work (other than rewriting the query to use
> subselects, use explicit id-rows, disabling hashjoin completely)?
> Or is this a bug?
>
> Regards,
> Dawid
>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
> choose an index scan if your joining column's datatypes do not
> match
>
