all method
Returns a map of non-zero entries for the specified span
.
Implementation
Future<Map<int, int>> all(ActivitySpan span) async {
final list = await _getList(_data[span]!);
final result = <int, int>{};
for (var i = 0; i < list.length; i++) {
if (list[i] != 0) result[i] = list[i];
}
return result;
}