functional test for group with join combination that makes binding _o…

…rd to be empty in results.c

data/group-by.ttl

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+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
+@prefix owl:  <http://www.w3.org/2002/07/owl#> .
+@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+
+<http://foaf.qdos.com/a> a <http://foaf.qdos.com/something>.
+<http://foaf.qdos.com/b> a <http://foaf.qdos.com/something> .
+<http://foaf.qdos.com/c> a <http://foaf.qdos.com/something> .
+<http://foaf.qdos.com/d> a <http://foaf.qdos.com/something> .
+<http://foaf.qdos.com/e> a <http://foaf.qdos.com/something> .
+
+<http://foaf.qdos.com/1> a owl:Class;
+    rdfs:subClassOf <http://foaf.qdos.com/0>;
+    skos:prefLabel "class 1";
+.
+
+<http://foaf.qdos.com/11> a owl:Class;
+    rdfs:subClassOf <http://foaf.qdos.com/1>;
+    skos:prefLabel "class 11";
+.
+
+<http://foaf.qdos.com/12> a owl:Class;
+    rdfs:subClassOf <http://foaf.qdos.com/1>;
+    skos:prefLabel "class 12";
+.
+
+<http://foaf.qdos.com/13> a owl:Class;
+    rdfs:subClassOf <http://foaf.qdos.com/1>;
+    skos:prefLabel "class 13";
+.
+
+<http://foaf.qdos.com/2> a owl:Class;
+    rdfs:subClassOf <http://foaf.qdos.com/0>;
+    skos:prefLabel "class 2";
+.
+
+<http://foaf.qdos.com/21> a owl:Class;
+    rdfs:subClassOf <http://foaf.qdos.com/2>;
+    skos:prefLabel "class 21";
+.
+
+<http://foaf.qdos.com/3> a owl:Class;
+    rdfs:subClassOf <http://foaf.qdos.com/0>;
+    skos:prefLabel "class 3";
+.
+
+<http://foaf.qdos.com/0> a owl:Class;
+    skos:prefLabel "class 0";
+.
+

tests/httpd/exemplar/groupby-multiple-joins

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+201 imported successfully
+This is a 4store SPARQL server [VERSION]
+Query: 
+PREFIX owl: <http://www.w3.org/2002/07/owl#>
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
+
+SELECT DISTINCT ?child (COUNT(?sub_child) as ?c)
+FROM <http://example.com/group-by.ttl>
+WHERE { 
+       ?child a owl:Class .
+       ?child rdfs:subClassOf <http://foaf.qdos.com/0> .
+       OPTIONAL { ?sub_child rdfs:subClassOf ?child . }
+} GROUP BY ?child ORDER BY ASC(xsd:integer(?c))
+
+?child	?c
+<http://foaf.qdos.com/3>	0
+<http://foaf.qdos.com/2>	1
+<http://foaf.qdos.com/1>	3
+200 deleted successfully
+This is a 4store SPARQL server [VERSION]

tests/httpd/scripts/groupby-multiple-joins

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+#!/bin/bash
+
+source sparql.sh
+
+put "$EPR" ../../data/group-by.ttl 'text/turtle' 'http://example.com/group-by.ttl'
+
+sparql "$EPR" '
+PREFIX owl: <http://www.w3.org/2002/07/owl#>
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
+
+SELECT DISTINCT ?child (COUNT(?sub_child) as ?c)
+FROM <http://example.com/group-by.ttl>
+WHERE { 
+       ?child a owl:Class .
+       ?child rdfs:subClassOf <http://foaf.qdos.com/0> .
+       OPTIONAL { ?sub_child rdfs:subClassOf ?child . }
+} GROUP BY ?child ORDER BY ASC(xsd:integer(?c))
+'
+
+delete "$EPR" 'http://example.com/group-by.ttl'