Re: B-Tree support function number 3 (strxfrm() optimization)

On Tue, Jan 20, 2015 at 3:57 PM, Peter Geoghegan <pg@heroku.com> wrote:
> It's certainly possible to fix Andrew's test case with the attached.
> I'm not sure that that's the appropriate fix, though: there is
> probably a case to be made for not bothering with abbreviation once
> we've read tuples in for the final merge run. More likely, the
> strongest case is for storing the abbreviated keys on disk too, and
> reading those back.

Maybe not, though: An extra 8 bytes per tuple on disk is not free.
OTOH, if we're I/O bound on the final merge, as we ought to be, then
recomputing the abbreviated keys could make sense, since there may
well be an idle CPU core anyway.

-- 
Peter Geoghegan