Re: Getting sorted data from foreign server for merge join

On 2015/11/10 0:56, Robert Haas wrote:
> On Sat, Nov 7, 2015 at 12:07 PM, Corey Huinker <corey.huinker@gmail.com> wrote:
>> Sorry to barge in late, but I was wondering if what we've learned with this
>> patch can be applied to the case of asserting a sort order on a query
>> returning from dblink().
> 
> Nope.
> 
> Sorry to the bearer of bad news, but that would be a different and
> much harder development project.  Set-returning functions have no way
> to indicate anything about the ordering of their return values at
> present.  We could invent something, but the work involved wouldn't
> have much to do with this patch.

There was a patch (which, it seems, was rejected [1]) to do this sort of
thing.

Thanks,
Amit

[1] https://commitfest.postgresql.org/4/88/