沉重 sql window api

Question

我尝试使用 flink sql window api： https://ci.apache.org/projects/flink/flink-docs-release-1.3/dev/table_api.html#group-windows

StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
StreamTableEnvironment tableEnv = TableEnvironment.getTableEnvironment(env);

// ingest a DataStream from an external source
DataStream<Tuple3<Long, String, Integer>> ds = env.addSource(...);
// register the DataStream as table "Orders"
tableEnv.registerDataStream("Orders", ds, "user, product, amount");

// compute SUM(amount) per day (in event-time)
Table result1 = tableEnv.sql(
  "SELECT user, " +
  "  TUMBLE_START(rowtime(), INTERVAL '1' DAY) as wStart,  " +
  "  SUM(amount) FROM Orders " + 
  "GROUP BY TUMBLE(rowtime(), INTERVAL '1' DAY), user");

显示错误：

No match found for function signature rowtime()

请给我一个关于 flink-sql-window api 和 rowtime.Thx.

的更详细的例子

Answer 1

目前文档有点不同步，但社区正在单独的分支中进行处理。 Flink 1.3 引入了所谓的 "time attributes" 以便将来更明确地访问、表达和处理时间。

您可以在 current documentation draft. Some examples how to use the time attributes in a table program can be found here 中找到更多信息。

沉重 sql window api

flink sql window api

apache-flink

flink-streaming