findByIndex method
Index lookup.
Implementation
Future<List<Row>> findByIndex(String column, dynamic value) async {
final tree = indexes[column];
if (tree == null) {
return (await scan()).where((r) => r[column] == value).toList();
}
final ids = tree.search(value).toSet();
if (ids.isEmpty) return [];
return (await scan()).where((r) => ids.contains(r.id)).toList();
}