On Sun, Oct 25, 2015 at 11:59 AM, Simon Riggs wrote:
> On 22 October 2015 at 16:01, Robert Haas wrote:
>> If we make Gather projection-capable,
>> we can just end up with Gather->PartialSeqScan.
>
> Is there a reason not to do projection in the Gather node? I don't see one.
I don't see one eithe
On 22 October 2015 at 16:01, Robert Haas wrote:
> If we make Gather projection-capable,
> we can just end up with Gather->PartialSeqScan.
>
Is there a reason not to do projection in the Gather node? I don't see one.
> > That said, I don't understand Tom's comment either. Surely the planner
>
On Thu, Oct 22, 2015 at 2:49 PM, Robert Haas wrote:
> You probably would, but sometimes that might not be possible; for
> example, the tlist might contain a parallel-restricted function (which
> therefore has to run in the leader).
Oh, also: pushing down the tlist is actually sorta non-trivial at
On Thu, Oct 22, 2015 at 3:18 PM, Alvaro Herrera
wrote:
>> You probably would, but sometimes that might not be possible; for
>> example, the tlist might contain a parallel-restricted function (which
>> therefore has to run in the leader).
>
> I don't understand your reply. Failing to parallelize t
Robert Haas wrote:
> On Thu, Oct 22, 2015 at 1:38 PM, Tom Lane wrote:
> > Robert Haas writes:
> >> The Gather node, as currently committed, is neither projection-capable
> >> nor listed as an exception in is_projection_capable_plan. Amit
> >> discovered this in testing, and I hit it in my testin
On Thu, Oct 22, 2015 at 1:38 PM, Tom Lane wrote:
> Robert Haas writes:
>> The Gather node, as currently committed, is neither projection-capable
>> nor listed as an exception in is_projection_capable_plan. Amit
>> discovered this in testing, and I hit it in my testing as well. We
>> could just
Robert Haas writes:
> The Gather node, as currently committed, is neither projection-capable
> nor listed as an exception in is_projection_capable_plan. Amit
> discovered this in testing, and I hit it in my testing as well. We
> could just mark it as being not projection-capable, but I think it
The Gather node, as currently committed, is neither projection-capable
nor listed as an exception in is_projection_capable_plan. Amit
discovered this in testing, and I hit it in my testing as well. We
could just mark it as being not projection-capable, but I think it
might be better to go the oth
