Bruce Momjian <[EMAIL PROTECTED]> writes:
> Tom Lane wrote:
>> The problem is you can't prune anymore once you have existing pin on the
>> target page.  I'd really like to get around that, but so far it seems
>> unacceptably fragile --- the executor really doesn't expect tuples to
>> get moved around underneath it.

> I thought you could do the pruning before you pin the page only in
> update/insert cases.

But then what happens when you want to update a second tuple on the same
page?  None of our existing plan types release and reacquire pin if they
don't have to, and I really doubt that we want to give up that

                        regards, tom lane

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