> Just to avoid any confusion with the patch I sent out this 
> week, we are setting HEAP_UPDATE_ROOT on all tuples which are 
> HOT-updated.
> We set HEAP_ONLY_TUPLE for all tuples which does not have 
> index reference. So may be combination of (HEAP_UPDATE_ROOT & 
> ~HEAP_ONLY_TUPLE) can be used to identify index referred 
> tuple in a HOT-update chain.

Oh sorry. Thanks for the clarification. Imho HEAP_UPDATE_ROOT should be
renamed for this meaning then (or what does ROOT mean here ?).


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