HHH-18474 - add test for issue

Signed-off-by: Jan Schatteman <jschatte@redhat.com>

hibernate-core/src/test/java/org/hibernate/orm/test/mapping/converted/converter/AttributeConverterAndFunctionTest.java

@@ -0,0 +1,120 @@
+/*
+ * 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.mapping.converted.converter;
+
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.FailureExpected;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Converter;
+import jakarta.persistence.Tuple;
+import jakarta.persistence.TypedQuery;
+import jakarta.persistence.criteria.CriteriaBuilder;
+import jakarta.persistence.criteria.CriteriaQuery;
+import jakarta.persistence.criteria.Path;
+import jakarta.persistence.criteria.Root;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@DomainModel(annotatedClasses = {EntityWithEnum.class} )
+@SessionFactory
+public class AttributeConverterAndFunctionTest {
+
+	@BeforeAll
+	public void setup(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					session.persist( new EntityWithEnum( 1L, State.SOMESTATE ) );
+				}
+		);
+	}
+
+	@AfterAll
+	public void tearDown(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					session.createMutationQuery( "delete from EntityWithEnum" ).executeUpdate();
+				}
+		);
+	}
+
+	@Test
+	@JiraKey( "HHH-18474" )
+	@FailureExpected
+	public void testFunctionOnConvertedEnum(SessionFactoryScope scope) {
+		scope.inSession(
+				session -> {
+					CriteriaBuilder cb = session.getCriteriaBuilder();
+					CriteriaQuery<Tuple> cq = cb.createTupleQuery();
+					final Root<EntityWithEnum> from = cq.from( EntityWithEnum.class );
+
+					Path<State> state = from.get( EntityWithEnum_.state );
+					cq.multiselect( cb.function("max", State.class, state) );
+					final TypedQuery<Tuple> query = session.createQuery( cq );
+					final List<Tuple> results = query.getResultList();
+
+					// The result should be SOMESTATE
+					final State resultState = results.get(0).get(0, State.class);
+					assertEquals(State.SOMESTATE, resultState);
+				}
+		);
+	}
+
+	public enum State {
+		SOMESTATE(2),
+		OTHER(3),
+		EVENMORE(1);
+
+		private static final Map<Integer, State> LOOKUP = new HashMap<>();
+
+		static {
+			for (State type : EnumSet.allOf( State.class)) {
+				LOOKUP.put(type.getValue(), type);
+			}
+		}
+		private final Integer value;
+
+		State(final Integer value) {
+			this.value = value;
+		}
+
+		public Integer getValue() {
+			return value;
+		}
+
+		public static State getEnum(final Integer value) {
+			return LOOKUP.get(value);
+		}
+	}
+
+	@Converter
+	public static class StateJpaConverter implements AttributeConverter<State, Integer> {
+
+		@Override
+		public Integer convertToDatabaseColumn(final State state) {
+			return state == null ? null : state.getValue();
+		}
+
+		@Override
+		public State convertToEntityAttribute(final Integer dbData) {
+			return dbData == null ? null : State.getEnum( dbData);
+		}
+	}
+
+}

hibernate-core/src/test/java/org/hibernate/orm/test/mapping/converted/converter/EntityWithEnum.java

@@ -0,0 +1,30 @@
+/*
+ * 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.mapping.converted.converter;
+
+import jakarta.persistence.Convert;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+
+/**
+ * @author Jan Schatteman
+ */
+@Entity(name = "EntityWithEnum")
+public class EntityWithEnum {
+	@Id
+	private Long id;
+	@Convert(converter = AttributeConverterAndFunctionTest.StateJpaConverter.class)
+	private AttributeConverterAndFunctionTest.State state;
+
+	public EntityWithEnum() {
+	}
+
+	public EntityWithEnum(Long id, AttributeConverterAndFunctionTest.State state) {
+		this.id = id;
+		this.state = state;
+	}
+}