Hi all, I'm wondering if someone can help me check my understanding of how ARQ evaluates the following DAWG test query. Output below using Fuseki 1.1.0 ( How do I check which version of ARQ is in this version of Fuseki?). I'm wondering if in the first un-optimized algebra form, this amounts to a filter of the values for the given variables? And, in the second are the values injected into the BGP, so that in effect the execution plan would essentially be the same as a UNION of two graph patterns with the constants bound? If I'm not correct here, then how do these two patterns differ?
Thanks, Tim PREFIX dc: <http://purl.org/dc/elements/1.1/> PREFIX : <http://example.org/book/> PREFIX ns: <http://example.org/ns#> SELECT ?book ?title ?price WHERE { ?book dc:title ?title . ?book ns:price ?price } VALUES ( ?book ?title ) { ( UNDEF "SPARQL Tutorial" ) ( :book2 UNDEF ) } Algebra: 1 (base <http://example/base/> 2 (prefix ((dc: <http://purl.org/dc/elements/1.1/>) 3 (: <http://example.org/book/>) 4 (ns: <http://example.org/ns#>)) 5 (project (?book ?title ?price) 6 (join 7 (bgp 8 (triple ?book dc:title ?title) 9 (triple ?book ns:price ?price) 10 ) 11 (table (vars ?book ?title) 12 (row [?title "SPARQL Tutorial"]) 13 (row [?book :book2]) 14 ))))) With Optimizations: 1 (base <http://example/base/> 2 (prefix ((dc: <http://purl.org/dc/elements/1.1/>) 3 (: <http://example.org/book/>) 4 (ns: <http://example.org/ns#>)) 5 (project (?book ?title ?price) 6 (sequence 7 (table (vars ?book ?title) 8 (row [?title "SPARQL Tutorial"]) 9 (row [?book :book2]) 10 ) 11 (bgp 12 (triple ?book dc:title ?title) 13 (triple ?book ns:price ?price) 14 )))))
