Re: GiST VACUUM

> 16 июля 2018 г., в 18:58, Robert Haas <robertmhaas@gmail.com> написал(а):
>
> On Fri, Jul 13, 2018 at 10:10 AM, Heikki Linnakangas <hlinnaka@iki.fi> wrote:
>> I'm still a bit scared about using pd_prune_xid to store the XID that
>> prevents recycling the page too early. Can we use some field in
>> GISTPageOpaqueData for that, similar to how the B-tree stores it in
>> BTPageOpaqueData?
>
> What's your reason for being scared?  It seems to me that the
> alternatives being proposed (altering the size of the special space,
> or sometimes repurposing a field for some other purpose) have their
> own associated scariness.

Thanks, that's exactly what I'm thinking about where to store this xid.

Here's v9 of the patch, it uses pd_prune_xid, but it is abstracted to GistPageGetDeleteXid() \ GistPageSetDeleteXid()
sothat we can change the way we store it easily. 

Best regards, Andrey Borodin.