On Tue, Jun 28, 2016 at 6:51 AM, Robert Haas <robertmh...@gmail.com> wrote:
> On Thu, Jun 23, 2016 at 12:53 AM, Michael Paquier
> <michael.paqu...@gmail.com> wrote:
>> On Thu, Jun 23, 2016 at 1:46 PM, Michael Paquier
>> <michael.paqu...@gmail.com> wrote:
>>> On Thu, Jun 23, 2016 at 1:42 PM, Michael Paquier
>>> <michael.paqu...@gmail.com> wrote:
>>>> While looking at the module I found two mistakes in the docs:
>>>> pg_visibility_map and pg_visibility *not* taking in input a block
>>>> number are SRFs, and return a set of records. The documentation is
>>>> just listing them with "returns record". A patch is attached.
>> And would it actually make sense to have pg_check_frozen(IN regclass,
>> IN blkno) to target only a certain page? Same for pg_check_visible. It
>> would take a long time to run those functions on large tables as they
>> scan all the pages of a relation at once..
> Under what circumstances would you wish to check only one page of a relation?

What I'd like to be able to do is to stop scanning the relation once
one defective tuple has been found: if there is at least one problem,
the whole vm needs to be rebuilt anyway. So this function could be
wrapped in a plpgsql function for example. It is more flexible than
directly modifying this function so as it stops at the first problem

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