> Not so bad. Try something like this:
> SELECT min(id+1) as id_new FROM table
>     WHERE (id+1) NOT IN (SELECT id FROM table);
> Now, this requires probably a sequential scan, but I'm not sure how
> can get around that.
> Maybe if you got trickier and did some ordering and limits. The above
> seems to give the right answer, though.

it does, but it is still faster than generate_series(), which requires
both a seqscan and a materialization of the function.
> I don't know how big you want to scale to.

big. :)


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