GH-5247 fix issue with LeftJoinIterator when a condition is used

Author: hmottestad

core/queryalgebra/evaluation/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/iterator/LeftJoinIterator.java

@@ -175,8 +175,6 @@ protected BindingSet getNextElement() throws QueryEvaluationException {
 					// Join failed, return left arg's bindings
 					return leftBindings;
 				}
-
-				return null;
 			}
 		} catch (NoSuchElementException ignore) {
 			// probably, one of the iterations has been closed concurrently in

core/queryalgebra/evaluation/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/optimizer/ConjunctiveConstraintSplitterOptimizer.java

@@ -69,7 +69,7 @@ public void meet(LeftJoin node) {
 			super.meet(node);
 
 			if (node.getCondition() != null) {
-				List<ValueExpr> conjunctiveConstraints = new ArrayList<>(16);
+				List<ValueExpr> conjunctiveConstraints = new ArrayList<>();
 				getConjunctiveConstraints(node.getCondition(), conjunctiveConstraints);
 
 				TupleExpr arg = node.getRightArg();

testsuites/repository/src/main/java/org/eclipse/rdf4j/testsuite/repository/TupleQueryResultTest.java

@@ -389,9 +389,6 @@ public void testLeftJoinWithJoinCondition() throws IOException {
 		con.begin();
 		try (TupleQueryResult evaluate = tupleQuery.evaluate()) {
 			assertTrue(evaluate.hasNext());
-			while (evaluate.hasNext()) {
-				System.out.println(evaluate.next());
-			}
 		}
 		con.commit();