HHH-10757 : select new ..." with CAST( NULL AS ...) fails

Author: gbadner

hibernate-core/src/main/antlr/sql-gen.g

@@ -475,6 +475,7 @@ arguments
 
 castExpression
 	: selectExpr
+	| NULL { out("null"); }
 	;
 
 castTargetType

hibernate-core/src/test/java/org/hibernate/test/hql/CastNullSelectExpressionTest.java

@@ -0,0 +1,121 @@
+/*
+ * 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.test.hql;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+import org.junit.Test;
+
+import org.hibernate.Session;
+import org.hibernate.hql.internal.ast.QuerySyntaxException;
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+/**
+ * @author Gail Badner
+ */
+@TestForIssue( jiraKey = "HHH-10757")
+public class CastNullSelectExpressionTest extends BaseCoreFunctionalTestCase {
+
+	@Test
+	@TestForIssue(jiraKey = "HHH-10757")
+	public void testSelectCastNull() {
+		Session s = openSession();
+		s.getTransaction().begin();
+		Person person = new Person();
+		person.firstName = "Herman";
+		person.middleName = "Joseph";
+		person.lastName = "Munster";
+		s.persist( person );
+		s.flush();
+		s.clear();
+
+		Object[] result = (Object[]) s.createQuery(
+				"select firstName, cast( null as string ), lastName from CastNullSelectExpressionTest$Person where lastName='Munster'"
+		).uniqueResult();
+
+		assertEquals( 3, result.length );
+		assertEquals( "Herman", result[0] );
+		assertNull( result[1] );
+		assertEquals( "Munster", result[2] );
+
+		s.getTransaction().rollback();
+		s.close();
+	}
+
+	@Test
+	@TestForIssue(jiraKey = "HHH-10757")
+	public void testSelectNewCastNull() {
+		Session s = openSession();
+		s.getTransaction().begin();
+		Person person = new Person();
+		person.firstName = "Herman";
+		person.middleName = "Joseph";
+		person.lastName = "Munster";
+		s.persist( person );
+		s.flush();
+		s.clear();
+
+		Person result = (Person) s.createQuery(
+				"select new CastNullSelectExpressionTest$Person( id, firstName, cast( null as string ), lastName ) from CastNullSelectExpressionTest$Person where lastName='Munster'"
+		).uniqueResult();
+		assertEquals( "Herman", result.firstName );
+		assertNull( result.middleName );
+		assertEquals( "Munster", result.lastName );
+
+		s.getTransaction().rollback();
+		s.close();
+	}
+
+	@Override
+	protected Class<?>[] getAnnotatedClasses() {
+		return new Class[] { Person.class };
+	}
+
+	@Entity
+	@Table(name = "PERSON")
+	private static class Person {
+		@Id
+		@GeneratedValue
+		private long id;
+
+		private String firstName;
+
+		private String middleName;
+
+		private String lastName;
+
+		private Integer age;
+
+		Person() {
+		}
+
+		public Person(long id, String firstName, String middleName, String lastName) {
+			this.id = id;
+			this.firstName = firstName;
+			this.middleName = middleName;
+			this.lastName = lastName;
+		}
+
+		public Person(long id, String firstName, Integer age, String lastName) {
+			this.id = id;
+			this.firstName = firstName;
+			this.middleName = null;
+			this.lastName = lastName;
+			this.age = age;
+		}
+
+	}
+}