> which is much closer to the actual number of rows removed by the index
> recheck + the one left.

Is it better to be closer?  We are saying those are the "actual"
values not the estimates.  If we cannot provide the actual rows, I
think it is better to provide nothing.  Something closer to the
reality would create more confusion.  Maybe, we just just return the
number of blocks, and put somewhere a note about it.  The actual row
count is already available on the upper part of the plan.

By the way, the estimation is a bigger problem than that.  Please see
my patch [1] about it.


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