Quoth Mathieu Schroeter <schroe...@epsitec.ch>, on 2010-10-20 15:41:51 +0200:
> Thanks for your interesting answer.
> 
> The first plan looks the best but it does not explain the ORDER BY.
> If I could done this job with pencil and paper, my way will be:
> 
> a) enumerate all entries in lol
> b) for each entry look up a corresponding row in tmp using its
>     primary key
> c) the loop over lol is complete, I see that tmp.data uses
>     `COLLATE foobar` then I look if an index exists.
> d) Yes then I use idx_foobar instead of many calls on the
>     comparison function.

In step (d), you're doing what?  Sorting the resulting rows?  How
exactly would you use the index for that?

   ---> Drake Wilson
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