/**
* Calculates abstract type of inner key. Must return null if no key defined or required.
* Primary types will be converted to appropriate sized integers.
*
* @return null|string
* @throws SchemaException
*/
public function getInnerKeyType()
{
if (empty($innerKey = $this->getInnerKey())) {
return null;
}
return $this->resolveAbstract($this->record->tableSchema()->column($innerKey));
}
