Apache Flink: Return type of function could not be determined automatically due to type erasure
解决方案:https://yangyichao-mango.github.io/2019/10/15/apache-flink-study-4-datastream-api/#%E5%8F%AF%E8%83%BD%E5%87%BA%E7%8E%B0%E7%9A%84%E9%97%AE%E9%A2%98
Apache Flink: Return type of function could not be determined automatically due to type erasure
解决方案:https://yangyichao-mango.github.io/2019/10/15/apache-flink-study-4-datastream-api/#%E5%8F%AF%E8%83%BD%E5%87%BA%E7%8E%B0%E7%9A%84%E9%97%AE%E9%A2%98