HHH-18450 Add test for issue

hibernate-core/src/test/java/org/hibernate/orm/test/hql/SingleSelectionArrayResultTest.java

@@ -0,0 +1,94 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.hql;
+
+import org.hibernate.testing.orm.domain.gambit.BasicEntity;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.Jira;
+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 static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Marco Belladelli
+ */
+@DomainModel( annotatedClasses = BasicEntity.class )
+@SessionFactory
+@Jira( "https://hibernate.atlassian.net/browse/HHH-18450" )
+public class SingleSelectionArrayResultTest {
+	@Test
+	public void testArrayResult(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			assertThat( session.createQuery(
+					"select 1",
+					Object[].class
+			).getSingleResult() ).containsExactly( 1 );
+			assertThat( session.createQuery(
+					"select cast(1 as integer)",
+					Object[].class
+			).getSingleResult() ).containsExactly( 1 );
+			assertThat( session.createSelectionQuery(
+					"select id from BasicEntity",
+					Object[].class
+			).getSingleResult() ).containsExactly( 1 );
+			assertThat( session.createSelectionQuery(
+					"select cast(id as integer) from BasicEntity",
+					Object[].class
+			).getSingleResult() ).containsExactly( 1 );
+			assertThat( session.createSelectionQuery(
+					"select ?1",
+					Object[].class
+			).setParameter( 1, 1 ).getSingleResult() ).containsExactly( 1 );
+			assertThat( session.createQuery(
+					"select cast(:p1 as integer)",
+					Object[].class
+			).setParameter( "p1", 1 ).getSingleResult() ).containsExactly( 1 );
+		} );
+	}
+
+	@Test
+	public void testNormalResult(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			assertThat( session.createQuery(
+					"select 1",
+					Object.class
+			).getSingleResult() ).isInstanceOf( Integer.class ).isEqualTo( 1 );
+			assertThat( session.createQuery(
+					"select cast(1 as integer)",
+					Object.class
+			).getSingleResult() ).isInstanceOf( Integer.class ).isEqualTo( 1 );
+			assertThat( session.createSelectionQuery(
+					"select id from BasicEntity",
+					Object.class
+			).getSingleResult() ).isInstanceOf( Integer.class ).isEqualTo( 1 );
+			assertThat( session.createSelectionQuery(
+					"select cast(id as integer) from BasicEntity",
+					Object.class
+			).getSingleResult() ).isInstanceOf( Integer.class ).isEqualTo( 1 );
+			assertThat( session.createSelectionQuery(
+					"select ?1",
+					Object.class
+			).setParameter( 1, 1 ).getSingleResult() ).isInstanceOf( Integer.class ).isEqualTo( 1 );
+			assertThat( session.createQuery(
+					"select cast(:p1 as integer)",
+					Object.class
+			).setParameter( "p1", 1 ).getSingleResult() ).isInstanceOf( Integer.class ).isEqualTo( 1 );
+		} );
+	}
+
+	@BeforeAll
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction( session -> session.persist( new BasicEntity( 1, "entity_1" ) ) );
+	}
+
+	@AfterAll
+	public void tearDown(SessionFactoryScope scope) {
+		scope.getSessionFactory().getSchemaManager().truncateMappedObjects();
+	}
+}