HHH-19949 Test to show that the issue has been resolved by HHH-19874

Author: dreab8

hibernate-core/src/test/java/org/hibernate/orm/test/fetch/FetchModeSubselectAndQueryJoinTest.java

@@ -0,0 +1,101 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.fetch;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+import jakarta.persistence.Tuple;
+import org.hibernate.annotations.Fetch;
+import org.hibernate.annotations.FetchMode;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@DomainModel(
+		annotatedClasses = {
+				FetchModeSubselectAndQueryJoinTest.Node.class,
+				FetchModeSubselectAndQueryJoinTest.Element.class
+		}
+)
+@SessionFactory
+@JiraKey( "HHH-19949" )
+public class FetchModeSubselectAndQueryJoinTest {
+
+	@BeforeAll
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					Node basik = new Node( "Child" );
+					basik.elements.add( new Element( basik ) );
+					basik.elements.add( new Element( basik ) );
+					session.persist( basik );
+				}
+		);
+	}
+
+	@Test
+	public void tesSelect(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					List<Tuple> results = session.createSelectionQuery(
+							"select distinct n, e from Node n join n.elements e ", Tuple.class ).getResultList();
+					assertThat( results ).hasSize( 2 );
+				}
+		);
+	}
+
+	@Entity(name = "Element")
+	@Table(name = "Element")
+	public static class Element {
+		@Id
+		@GeneratedValue
+		Integer id;
+
+		@ManyToOne
+		Node node;
+
+		public Element(Node node) {
+			this.node = node;
+		}
+
+		Element() {
+		}
+	}
+
+	@Entity(name = "Node")
+	@Table(name = "Node")
+	public static class Node {
+
+		@Id
+		@GeneratedValue
+		Integer id;
+		String string;
+
+		@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.PERSIST, mappedBy = "node")
+		@Fetch(FetchMode.SUBSELECT)
+		List<Element> elements = new ArrayList<>();
+
+		public Node(String string) {
+			this.string = string;
+		}
+
+		Node() {
+		}
+	}
+}