HHH-15495 - add test case

hibernate-core/src/test/java/org/hibernate/orm/test/aggregation/UuidAggregationTest.java

@@ -0,0 +1,51 @@
+package org.hibernate.orm.test.aggregation;
+
+import java.util.UUID;
+
+import org.hibernate.Session;
+import org.hibernate.Transaction;
+import org.hibernate.query.SelectionQuery;
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
+import org.junit.Test;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+
+public class UuidAggregationTest extends BaseCoreFunctionalTestCase {
+
+	@Entity
+	public static class UuidIdentifiedEntity {
+
+		@Id
+		private UUID id;
+
+		public UuidIdentifiedEntity() {
+			super();
+		}
+
+		public UUID getId() {
+			return id;
+		}
+
+		public void setId(final UUID id) {
+			this.id = id;
+		}
+	}
+
+	@Test
+	@TestForIssue(jiraKey = "HHH-15495")
+	public void hhh15495Test() throws Exception {
+		final Session s = openSession();
+		final Transaction tx = s.beginTransaction();
+		final SelectionQuery<UUID> query = s.createSelectionQuery( "SELECT MAX(id) from UuidIdentifiedEntity;", UUID.class );
+		query.getSingleResult();
+		tx.commit();
+		s.close();
+	}
+
+	@Override
+	protected Class<?>[] getAnnotatedClasses() {
+		return new Class[]{ UuidIdentifiedEntity.class };
+	}
+}