- From: Steve Harris <swh@ecs.soton.ac.uk>
- Date: Fri, 21 Dec 2012 10:14:44 +0000
- To: Bob DuCharme <bob@snee.com>
- Cc: public-sparql-dev@w3.org
It probably can't hurt - but note that the relative ordering of the OPTIONAL blocks can alter the semantics of the query (you need to have shared variables though). I generally try order for best readability, and then complain to the optimiser author if it can't pick a sensible optimisation :) - Steve On 2012-12-20, at 21:10, Bob DuCharme wrote: > Since OPTIONAL clauses have no chance of reducing the search space for their containing graph pattern, does it make sense as a general rule of thumb to put them after all the ones that do, i.e. after the non-OPTIONAL triple patterns? > > thanks, > > Bob > >
Received on Friday, 21 December 2012 10:15:13 UTC