"SchemaManagementException: Schema-validation: missing column [DTYPE] in table [...]" in Hibernate

Issue

• An entity hierarchy is defined using SINGLE_TABLE inheritance¹
• No DiscriminatorColumn was specified for the root entity

• At runtime, an exception is raised while validating a pre-existing database schema

  ... org.hibernate.tool.schema.spi.SchemaManagementException: Schema-validation: missing column [DTYPE] in table [MYSCHEMA.SOMEENTITY]
          at org.hibernate.tool.schema.internal.AbstractSchemaValidator.validateTable(AbstractSchemaValidator.java:136)
          at org.hibernate.tool.schema.internal.GroupedSchemaValidatorImpl.validateTables(GroupedSchemaValidatorImpl.java:42)
          at org.hibernate.tool.schema.internal.AbstractSchemaValidator.performValidation(AbstractSchemaValidator.java:89)
          at org.hibernate.tool.schema.internal.AbstractSchemaValidator.doValidation(AbstractSchemaValidator.java:68)
          at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:191)
          at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:72)
          at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:310)
          at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:467)
          at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:939)