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Re: [sub-select] Some examples and discussion

From: Chimezie Ogbuji <ogbujic@ccf.org>
Date: Thu, 12 Mar 2009 18:03:12 -0400
To: "Seaborne, Andy" <andy.seaborne@hp.com>, "Lee Feigenbaum" <lee@thefigtrees.net>
cc: "SPARQL Working Group" <public-rdf-dawg@w3.org>
Message-ID: <C5DEFEE0.84F6%ogbujic@ccf.org>
On 3/12/09 9:14 AM, "Seaborne, Andy" <andy.seaborne@hp.com> wrote:
> As for implementation, putting subs-selects was not hard when I added the
> functionality in ARQ and I didn't have an existing DB engine to pull existing
> features from.  I don't think it was luck that other designs decisions had set
> things up, more it was a natural step.  Other opinions may differ.
> What is hard, as had been pointed out, is optimization, but that is not to be
> specified.

I don't think I agree that optimization and implementation effort (which is
a direct consequence of the complexity introduced by more expressive query
forms such as sub-selects) should *not* be a factor.  In fact, it is mostly
my concern in this regard that motivates me to suggest that we consider a
spectrum of sub-select features to include.

-- Chimezie


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Received on Thursday, 12 March 2009 22:04:02 GMT

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