1. 生成测试数据
从原来ORC表中导出1000条数据生成avro表用于测试
create table user_install_status_avro stored as avro as
select * from user_install_status where dt='20141228' limit 1000;
从生成的AVRO文件中拿出hive AVRO格式表的schema，并修改成输出新表使用的avro schema
{"type": "record","name": "user_install_status_avro","namespace": "default","fields": [{"name": "aid","type": ["null","string"],"default": null},{"name": "pkgname","type": ["null","string"],"default": null}]}
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