我在练习twitter数据。我的数据在这里，https://drive.google.com/file/d/0bw1liibsl0xuqtfkmzltukputlk/view
我想从数据中提取id和文本，我按如下方式加载，但数据没有被读取。我已经注册了所有必需的jar。
a1 = LOAD '/user/training/my_hdfs/tweet.json' USING com.twitter.elephantbird.pig.load.JsonLoader('-nestedLoad') AS (tw:map[]); DUMP a1; Input(s): Successfully read 0 records (41027 bytes) from: "/user/training/my_hdfs/tweet.json" Output(s): Successfully stored 0 records in: "hdfs://localhost:8020/tmp/temp559014472/tmp1609007351" 请帮帮我！