Improve coverage GRAPH ?g {}

`Graph <...> {}` should return a single empty solution if the graph exists and no solution if it does not

Author: Tpt

sparql/sparql10/graph/graph-empty-exist.rq

@@ -0,0 +1 @@
+SELECT * { GRAPH <data-g1.ttl> {} }

sparql/sparql10/graph/graph-empty-exist.ttl

@@ -0,0 +1,5 @@
+@prefix rs:      <http://www.w3.org/2001/sw/DataAccess/tests/result-set#> .
+@prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+
+[]    rdf:type      rs:ResultSet ;
+      rs:solution   [] .

sparql/sparql10/graph/graph-empty-not-exist.rq

@@ -0,0 +1,3 @@
+PREFIX ex: <http://example.org/>
+
+SELECT * { GRAPH ex:unknown {} }

sparql/sparql10/graph/graph-empty-not-exist.ttl

@@ -0,0 +1,4 @@
+@prefix rs:      <http://www.w3.org/2001/sw/DataAccess/tests/result-set#> .
+@prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+
+[]    rdf:type      rs:ResultSet .

sparql/sparql10/graph/manifest.ttl

@@ -22,6 +22,8 @@
 	:dawg-graph-10b
 	:dawg-graph-11
 	:graph-empty
+	:graph-exist
+	:graph-not-exist
    ).
 
 :dawg-graph-01  rdf:type mf:QueryEvaluationTest ;
@@ -168,7 +170,7 @@
 
 :graph-empty  rdf:type mf:QueryEvaluationTest ;
     mf:name "graph-empty" ;
-    rdfs:comment  "Graph with empty BGP: list all named graphs" ;
+    rdfs:comment  "Variable graph with empty BGP: list all named graphs" ;
     mf:action
             [ qt:query        <graph-empty.rq> ;
               qt:data         <data-g1.ttl> ;
@@ -177,3 +179,26 @@
             ] ;
     mf:result  <graph-empty.ttl> ;
     .
+
+:graph-exist  rdf:type mf:QueryEvaluationTest ;
+    mf:name "graph-exist" ;
+    rdfs:comment  "Set graph with empty BGP: returns an empty tuple because the graph exists" ;
+    mf:action
+            [ qt:query        <graph-empty-exist.rq> ;
+              qt:data         <data-g1.ttl> ;
+              qt:graphData    <data-g1.ttl> ;
+              qt:graphData    <data-g2.ttl> ;
+            ] ;
+    mf:result  <graph-empty-exist.ttl> ;
+    .
+:graph-not-exist  rdf:type mf:QueryEvaluationTest ;
+    mf:name "graph-not-exist" ;
+    rdfs:comment  "Set graph with empty BGP: returns an empty tuple because the graph exists" ;
+    mf:action
+            [ qt:query        <graph-empty-not-exist.rq> ;
+              qt:data         <data-g1.ttl> ;
+              qt:graphData    <data-g1.ttl> ;
+              qt:graphData    <data-g2.ttl> ;
+            ] ;
+    mf:result  <graph-empty-not-exist.ttl> ;
+    .