Re: Pluggable storage

On Thu, Oct 12, 2017 at 2:23 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Thu, Oct 12, 2017 at 4:38 PM, Alexander Korotkov
>> However I imply that alternative storage would share our "MVCC model". So,
>> it
>> should share our transactional model including transactions,
>> subtransactions, snapshots etc.
>> Therefore, if alternative storage is transactional, then in particular it
>> should be able to fetch tuple with
>> given TID according to given snapshot. However, how it's implemented
>> internally is
>> a black box for us. Thus, we don't insist that tuple should have different
>> TID after update;
>> we don't insist there is any analogue of HOT; we don't insist alternative
>> storage needs vacuum
>> (or if even it needs vacuum, it might be performed in completely different
>> way) and so on.
>
> Fully agreed.

If we implement that interface, where does that leave EvalPlanQual()?
Do those semantics have to be preserved?

--
Peter Geoghegan