1 files changed, 16 insertions, 2 deletions

diff --git a/subprojects/store-query/src/main/java/tools/refinery/store/query/view/FunctionView.java b/subprojects/store-query/src/main/java/tools/refinery/store/query/view/FunctionView.java
index 74a5be07..5585f5f2 100644
--- a/subprojects/store-query/src/main/java/tools/refinery/store/query/view/FunctionView.java
+++ b/subprojects/store-query/src/main/java/tools/refinery/store/query/view/FunctionView.java
@@ -1,11 +1,11 @@
 /*
- * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ * SPDX-FileCopyrightText: 2021-2024 The Refinery Authors <https://refinery.tools/>
  *
  * SPDX-License-Identifier: EPL-2.0
  */
 package tools.refinery.store.query.view;
 
-import tools.refinery.store.query.term.*;
+import tools.refinery.logic.term.*;
 import tools.refinery.store.representation.Symbol;
 
 import java.util.ArrayList;
@@ -33,4 +33,18 @@ public final class FunctionView<T> extends AbstractFunctionView<T> {
         public <R> AssignedValue<R> aggregate(Aggregator<R, T> aggregator, NodeVariable... arguments) {
                 return aggregate(aggregator, List.of(arguments));
         }
+
+        public AssignedValue<T> leftJoin(T defaultValue, List<NodeVariable> arguments) {
+                return targetVariable -> {
+                        var placeholderVariable = Variable.of(getSymbol().valueType());
+                        var argumentsWithPlaceholder = new ArrayList<Variable>(arguments.size() + 1);
+                        argumentsWithPlaceholder.addAll(arguments);
+                        argumentsWithPlaceholder.add(placeholderVariable);
+                        return leftJoinBy(placeholderVariable, defaultValue, argumentsWithPlaceholder).toLiteral(targetVariable);
+                };
+        }
+
+        public AssignedValue<T> leftJoin(T defaultValue, NodeVariable... arguments) {
+                return leftJoin(defaultValue, List.of(arguments));
+        }
 }