> it seems fairly unlikely to me that this would be useful enough to > justify using up a precious hint bit. The applicability of the hint > is very short-term --- as soon as the tuple is dead to all transactions, > it can be marked with the existing LP_DEAD hint bit. And if it's only > useful for uniqueness checks, as seems to be the case, that's another > big restriction on the value. > > Right. It is of little value.
Gokul.
