@Override
public String get(Object key) {
if (JdbcIndexDefinition.this.identifier.equals(key)) return identifier;
if (keys.containsKey(key)) return keys.get(key);
check();
return map.get(key);
}
@Override
@SuppressWarnings("element-type-mismatch")
public V get(Object key) {
return backing.get(key);
}