Re: WIP: Join push-down for foreign tables

On 03.12.2011 01:05, Tom Lane wrote:
> Heikki Linnakangas<heikki.linnakangas@enterprisedb.com>  writes:
>> Hmm, so you're saying that the FDW function needs to be able to return
>> multiple paths for a single joinrel. Fair enough, and that's not
>> specific to remote joins. Even a single-table foreign scan could be
>> implemented differently depending on whether you prefer fast-start or
>> cheapest total.
>
> ... or ordered vs unordered, etc.  Yeah, good point, we already got this
> wrong with the PlanForeignScan API.  Good thing we didn't promise that
> would be stable.

This discussion withered down here...

I think the advice to Shigeru-san is to work on the API. We didn't reach 
a consensus on what exactly it should look like, but at least you need 
to be able to return multiple paths for a single joinrel, and should 
look at fixing the PlanForeignScan API to allow that too.

--   Heikki Linnakangas  EnterpriseDB   http://www.enterprisedb.com