无法从StreamBuilder查询子集合(Flutter)

import 'package:flutter/material.dart';

class MyWidget extends StatelessWidget {
  final Stream<List<int>> dataStream;

  MyWidget({this.dataStream});

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<List<int>>(
      stream: dataStream,
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return CircularProgressIndicator();
        }

        if (snapshot.hasError) {
          return Text('Error: ${snapshot.error}');
        }

        // 将数据流转换为列表
        final dataList = snapshot.data ?? [];

        // 查询子集合（例如，获取所有大于 5 的数字）
        final filteredList = dataList.where((value) => value > 5).toList();

        return ListView.builder(
          itemCount: filteredList.length,
          itemBuilder: (context, index) {
            return ListTile(
              title: Text(filteredList[index].toString()),
            );
          },
        );
      },
    );
  }
}