http://vinoyang.com/2017/06/12/flink-table-sql-source/
Flink Table&Sql 如何结合Apache Calcite
http://ju.outofmemory.cn/entry/335371
http://wuchong.me/blog/2017/03/30/flink-internals-table-and-sql-api/
Stream Processing for Everyone with SQL and Apache Flink
From Streams to Tables and Back Again: An Update on Flink’s Table & SQL API
https://calcite.apache.org/docs/stream.html
Flink SQL的实现
https://blog.****.net/pelick/article/details/51613931
http://mtunique.com/flink_sql/
http://vinoyang.com/2017/07/06/flink-relation-api-introduction/