On Tue, 2 May 2006, Tom Lane wrote:

>>> Agreed. The pin has two functions:
>>> - keep the page from being moved out of the bufmgr - no need anymore
>>> - stop a vacuum from removing the page - no need anymore. We'll not stop
>>> on a removable row anymore, so no need.
>
>> At the moment, backward scan returns to the page to walk left from there.
>
> Backwards scan may break this whole concept; are you sure you've thought
> it through?

I think so. The patch doesn't change the walk-left code. Do you have
something specific in mind?

- Heikki

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