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?


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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

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TIP 6: explain analyze is your friend

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