From a52a17eb030cbfd7575d3695c576c345db4cf9f6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20R=C3=B6der?= <michael.roeder@uni-paderborn.de>
Date: Fri, 20 Sep 2024 14:17:43 +0200
Subject: [PATCH] Added a dummy triple into the FILTER of the count query to
 ensure that Tentris executes it correctly.

---
 .../cel/refine/suggest/SparqlBasedSuggestor.java             | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/dice_research/cel/refine/suggest/SparqlBasedSuggestor.java b/src/main/java/org/dice_research/cel/refine/suggest/SparqlBasedSuggestor.java
index e702427..4271594 100644
--- a/src/main/java/org/dice_research/cel/refine/suggest/SparqlBasedSuggestor.java
+++ b/src/main/java/org/dice_research/cel/refine/suggest/SparqlBasedSuggestor.java
@@ -493,7 +493,10 @@ protected String createNotExistsFilter(ClassExpression context, String instanceV
                 for (ClassExpression expression : expressions) {
                     SparqlBuildingVisitor visitor = new SparqlBuildingVisitor(filterBuilder, "?pos", null, null, null);
                     visitor.setIntermediateVariableName("?y");
-                    filterBuilder.append("FILTER NOT EXISTS { ");
+                    filterBuilder.append("FILTER NOT EXISTS { \n        ");
+                    // We have to add a dummy triple
+                    filterBuilder.append(instanceVariable);
+                    filterBuilder.append(" a <http://www.w3.org/2002/07/owl#NamedIndividual> . \n");
                     expression.accept(visitor);
                     filterBuilder.append(" }\n");
                 }