Re: SPARQL EXISTS variations

• From: Andy Seaborne <andy@apache.org>
• Date: Wed, 20 Aug 2025 21:30:37 +0100
• To: public-rdf-star-wg@w3.org
• Message-ID: <c99277ac-9cb0-42f3-ae58-62f3413f6677@apache.org>

On 16/08/2025 15:45, Peter F. Patel-Schneider wrote:
> There was again discussion in the SPARQL EXISTS task force on different 
> solutions to the SPARQL EXISTS problems.  The solutions amount to, roughly:
> 
> Simple LEFTJOIN, where no bindings from outside the EXISTS affect the 
> pattern inside.

SEMIJOIN?

> Values injection at the beginning of the pattern (SHALLOW INJECTION).
> Values injection inside the pattern (DEEP INJECTION), with two variations
> values projected out in sub-SELECTs are not affected (PROJECTION) and
> values projected out in sub-SELECTs are affected.

Received on Wednesday, 20 August 2025 20:30:44 UTC