HHH-16551 - Test case demonstrating the bug

hibernate-core/src/test/java/org/hibernate/orm/test/schemaupdate/CreateCharDiscriminatorTest.java

@@ -0,0 +1,94 @@
+package org.hibernate.orm.test.schemaupdate;
+
+import java.sql.Types;
+import java.util.List;
+import java.util.Map;
+
+import org.hibernate.Session;
+import org.hibernate.jpa.boot.spi.Bootstrap;
+
+import org.hibernate.testing.orm.jpa.PersistenceUnitDescriptorAdapter;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.DiscriminatorColumn;
+import jakarta.persistence.DiscriminatorValue;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Inheritance;
+import jakarta.persistence.Table;
+
+import static jakarta.persistence.DiscriminatorType.CHAR;
+import static jakarta.persistence.InheritanceType.SINGLE_TABLE;
+import static org.hibernate.cfg.AvailableSettings.HBM2DDL_AUTO;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
+@JiraKey("HHH-16551")
+public class CreateCharDiscriminatorTest {
+
+	@Test
+	@JiraKey("HHH-16551")
+	public void testCreateDiscriminatorCharColumnSize() {
+		final PersistenceUnitDescriptorAdapter pu = new PersistenceUnitDescriptorAdapter() {
+			@Override
+			public List<String> getManagedClassNames() {
+				return List.of( Parent.class.getName() );
+			}
+		};
+
+
+		final var settings = Map.of( HBM2DDL_AUTO, "create-drop" );
+
+		try (var factory = Bootstrap.getEntityManagerFactoryBuilder( pu, settings ).build();
+			 var manager = factory.createEntityManager()) {
+			manager.unwrap( Session.class ).doWork( conn -> {
+				try (var rs = conn.getMetaData().getColumns( null, null, null, null )) {
+					if ( rs.next() ) {
+						do {
+							if ( "parent".equalsIgnoreCase( rs.getString( "TABLE_NAME" ) ) &&
+									"discr".equalsIgnoreCase( rs.getString( "COLUMN_NAME" ) ) ) {
+								assertEquals( Types.CHAR, rs.getInt( "DATA_TYPE" ) );
+								assertEquals( 1, rs.getInt( "COLUMN_SIZE" ) );
+							}
+						} while ( rs.next() );
+					}
+					else {
+						fail( "Table and/or columns has not been created, why?!?" );
+					}
+				}
+			} );
+		}
+	}
+
+	@Entity
+	@Table(name = "parent")
+	@Inheritance(strategy = SINGLE_TABLE)
+	@DiscriminatorColumn(name = "discr", discriminatorType = CHAR)
+	@DiscriminatorValue("*")
+	public static class Parent {
+
+		@Id
+		private Integer id;
+
+		@Column
+		private String name;
+
+		public Integer getId() {
+			return id;
+		}
+
+		public void setId(Integer id) {
+			this.id = id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+	}
+}