fields function

Selection<Map<String, Object?>> fields(Map<String, Selection<Object?>> selected)

Runtime field selection deliberately returns dynamic values.

Captures the selected names and projections now and builds a map for each decoded row. Use a scalar or Record selection when result fields are known statically and their individual Dart types should be preserved.

Implementation

Selection<Map<String, Object?>> fields(
  Map<String, Selection<Object?>> selected,
) {
  final entries = selected.entries.toList(growable: false);
  return _Combined(
    [for (final e in entries) e.value],
    (read) =>
        (row) => {
          for (var i = 0; i < entries.length; i++) entries[i].key: read[i](row),
        },
  );
}