Jeff Davis <pg...@j-davis.com> wrote:
 
> I don't think this function really cares about the visibility with
> respect to the current snapshot, right?
 
What it cares about is whether some other particular top level
transaction wrote a tuple which we *would* read except that it is
not visible to us because that other top level transaction is
concurrent with ours.  If so, we want to flag a read-write conflict
out from our transaction and in to that other transaction.
 
-Kevin

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