/**
 * @Entity
 * @Table(name="actions")
 * @InheritanceType("JOINED")
 * @DiscriminatorColumn(name="type", type="string")
 * @DiscriminatorMap({"FOO" = "FooAction", "BAR" = "BarAction", ...})
 */
abstract class AbstractAction
{
    ...
}

/**
 * @Entity
 * @Table(name="actions_foo")
 */
class FooAction extends AbstractAction
{
   ...
}

/**
 * @Entity
 * @Table(name="actions")
 */
class BarAction extends AbstractAction
{
   ...
}

PDOException: SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens

DoctrineORMMappingMappingException: Class BarAction is not a valid entity or mapped super class.