解析出的数据，没有内容

[xxiiaass]

{"version":169835152,"id":1000,"sourceTimestamp":1600346745,"sourcePosition":"96664785@84","safeSourcePosition":"96664785@84","sourceTxid":"883473212","source":{"sourceType":"TXlTUUw=","version":"5.6.16-log"},"operation":"Q09NTUlU","objectName":null,"processTimestamps":null,"tags":{"readerThroughoutTime":"1600346750213","thread_id":"8383494"},"fields":null,"beforeImages":null,"afterImages":null,"bornTimestamp":1600346745}
tags, beforeImages, afterImages等字段都是空，完全用的官方示例