> I think writetup_rawheap() and readtup_rawheap() are a little  complex,
> but should work as long as there are no padding between t_len and  t_self
> in HeapTupleData struct.
> 
> - It might be cleaner if you write the  total item length
>   and tuple data separately.
> - "(char *) tuple +  sizeof(tuplen)" might be more robust
>   than  "&tuple->t_self".


- I used your functions 
- changed the docs for CLUSTER (I don't know if they make sense/are enough)
- added a minor comment


2 questions:
 
1) about the "copy&paste from FormIndexDatum" comment: how can I improve it?
The idea is that we could have a faster call, but it would mean copying and
pasting a lot of code from FormIndexDatum.

2) what other areas can I comment more?


      

Attachment: sorted_cluster-20100721.patch
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