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Re: can subqueries be executed first in SPARQL?

From: Gregory Williams <greg@evilfunhouse.com>
Date: Thu, 16 Jun 2016 16:18:04 -0700
Cc: public-sparql-dev@w3.org
Message-Id: <33813AC1-65EB-4C5B-A03C-63B9014EBE7D@evilfunhouse.com>
To: "Peter F. Patel-Schneider" <pfpschneider@gmail.com>
On Jun 16, 2016, at 4:11 PM, Peter F. Patel-Schneider <pfpschneider@gmail.com> wrote:
> 
> 
>> The wording here is a bit awkward, but I believe the subquery evaluation
>> is still occurring first *within the context of the evaluating the EXISTS
>> pattern*.
> 
> There is no such qualifier in the wording.

Agreed.

>> I think calling out the bottom-up semantics here is a good thing, but the
>> text might have benefited from discussing how evaluating EXISTS patterns
>> is different than evaluating other type of pattern.
> 
> I don't consider calling out something that is not true a good thing.

I am suggesting that qualifying the sentence would be more appropriate than removing it entirely, because in all cases other than sub-selects within EXISTS blocks, it is a true statement (as should be clear from the evaluation semantics).

.greg
Received on Thursday, 16 June 2016 23:18:29 UTC

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