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Update Flink_Data_Transformation.md

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heibaiying 2019-10-26 20:27:57 +08:00 committed by GitHub
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@ -176,10 +176,10 @@ split.select("even").print();
project 主要用于获取 tuples 中的指定字段集，示例如下： project 主要用于获取 tuples 中的指定字段集，示例如下：
```java ```java
DataStreamSource<Tuple3<String, Integer, String>> tuple3DataStreamSource = env.fromElements( DataStreamSource<Tuple3<String, Integer, String>> streamSource = env.fromElements(
new Tuple3<>("li", 22, "2018-09-23"), new Tuple3<>("li", 22, "2018-09-23"),
new Tuple3<>("ming", 33, "2020-09-23")); new Tuple3<>("ming", 33, "2020-09-23"));
tuple3DataStreamSource.project(0,2).print(); streamSource.project(0,2).print();
// 输出 // 输出
(li,2018-09-23) (li,2018-09-23)