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

On Tue, Nov 25, 2014 at 4:01 AM, Robert Haas  wrote:
> There's a lot of stuff in this patch I'm still trying to digest

I spotted a bug in the most recent revision. Mea culpa.

I think that the new field Tuplesortstate.abbrevNext should be an
int64, not an int. The fact that Tuplesortstate.memtupcount is an int
is not reason enough to make abbrevNext an int -- after all, with the
patch applied tuplesort uses a doubling growth strategy in respect of
abbrevNext, whereas grow_memtuples() is very careful about integer
overflow when growing memtupcount. I suggest we follow the good
example of tuplesort_skiptuples() in making our "ntuples" variable
(Tuplesortstate.abbrevNext) an int64 instead. The alternative is to
add grow_memtuples()-style checks.

-- 
Peter Geoghegan