HHH-16505 Add test for issue

hibernate-core/src/test/java/org/hibernate/orm/test/query/LeftJoinNullnessPredicateQueryTest.java

@@ -0,0 +1,165 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.query;
+
+import java.util.List;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToOne;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Marco Belladelli
+ */
+@SessionFactory
+@DomainModel( annotatedClasses = {
+		LeftJoinNullnessPredicateQueryTest.Author.class,
+		LeftJoinNullnessPredicateQueryTest.Book.class
+} )
+public class LeftJoinNullnessPredicateQueryTest {
+	@BeforeAll
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final Author hpLovecraft = new Author( "Howard Phillips Lovecraft", false );
+			final Author sKing = new Author( "Stephen King", true );
+			session.persist( hpLovecraft );
+			session.persist( sKing );
+			session.persist( new Book( "The Shining", sKing ) );
+			session.persist( new Book( "The Colour Out of Space", hpLovecraft ) );
+			session.persist( new Book( "Unknown Author", null ) );
+		} );
+	}
+
+	@AfterAll
+	public void tearDown(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			session.createMutationQuery( "delete from Book" ).executeUpdate();
+			session.createMutationQuery( "delete from Author" ).executeUpdate();
+		} );
+	}
+
+	@Test
+	public void testIsNull(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final List<Book> resultList = session.createQuery(
+					"select book from Book book " +
+					"left join book.author a " +
+					"where a is null",
+					Book.class
+			).getResultList();
+			assertThat( resultList ).hasSize( 1 );
+			assertThat( resultList.get( 0 ).getTitle() ).isEqualTo( "Unknown Author" );
+		} );
+	}
+
+	@Test
+	public void testIsNotNull(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final List<Book> resultList = session.createQuery(
+					"select book from Book book " +
+					"left join book.author a " +
+					"where a is not null",
+					Book.class
+			).getResultList();
+			assertThat( resultList ).hasSize( 2 );
+			assertThat( resultList.stream().map( b -> b.title ) ).contains( "The Shining", "The Colour Out of Space" );
+		} );
+	}
+
+	@Test
+	public void testIsNotNullWithCondition(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final List<Book> resultList = session.createQuery(
+					"select book from Book book " +
+					"left join book.author a with a.alive = true " +
+					"where a is not null",
+					Book.class
+			).getResultList();
+			assertThat( resultList ).hasSize( 1 );
+			assertThat( resultList.get( 0 ).getTitle() ).isEqualTo( "The Shining" );
+		} );
+	}
+
+	@Test
+	public void testIsNullWithCondition(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final List<Book> resultList = session.createQuery(
+					"select book from Book book " +
+					"left join book.author a with a.alive = true " +
+					"where a is null",
+					Book.class
+			).getResultList();
+			assertThat( resultList ).hasSize( 2 );
+			assertThat( resultList.stream().map( b -> b.title ) ).contains( "Unknown Author", "The Colour Out of Space" );
+		} );
+	}
+
+	@Entity( name = "Book" )
+	public static class Book {
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		private String title;
+
+		@ManyToOne
+		private Author author;
+
+		public Book() {
+		}
+
+		public Book(String title, Author author) {
+			this.title = title;
+			this.author = author;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public Author getAuthor() {
+			return author;
+		}
+	}
+
+	@Entity( name = "Author" )
+	public static class Author {
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		private String name;
+
+		private boolean alive;
+
+		public Author() {
+		}
+
+		public Author(String name, boolean alive) {
+			this.name = name;
+			this.alive = alive;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public boolean isAlive() {
+			return alive;
+		}
+	}
+}