release method
Implementation
void release(String id) {
final ds = _dataSets.remove(id.toLowerCase()); // @@@ case-insensitive
if (ds != null && ds.active) ds.close();
}
void release(String id) {
final ds = _dataSets.remove(id.toLowerCase()); // @@@ case-insensitive
if (ds != null && ds.active) ds.close();
}