[GitHub] sunjincheng121 commented on a change in pull request #7196: [FLINK-10974] [table] Add support for flatMap to table API

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sunjincheng121 commented on a change in pull request #7196: [FLINK-10974] [table] Add support for flatMap to table API
URL: https://github.com/apache/flink/pull/7196#discussion_r238476606
 
 

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 File path: docs/dev/table/tableApi.md
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 @@ -1682,6 +1682,60 @@ The `OverWindow` defines a range of rows over which aggregates are computed. `Ov
 
 {% top %}
 
+### Map
+
+Map performs a map operation with an user-defined scalar function or built-in scalar function. The output will be flattened if the output type is a composite type.
+
+<div class="codetabs" markdown="1">
+<div data-lang="java" markdown="1">
+{% highlight java %}
+ScalarFunction func = new MyMapFunction();
+tableEnv.registerFunction("func", func);
+
+Table table = input
+  .map(func("c")).as("a, b")
+{% endhighlight %}
+</div>
+
+<div data-lang="scala" markdown="1">
+{% highlight scala %}
+val func: ScalarFunction = new MyMapFunction()
+
+val table = input
+  .map(func('c)).as('a, 'b)
+{% endhighlight %}
+</div>
+</div>
+
+{% top %}
+
+### FlatMap
+
+FlatMap performs a flatMap operation with an user-defined table function.
+
+<div class="codetabs" markdown="1">
+<div data-lang="java" markdown="1">
+{% highlight java %}
+TableFunction func = new MyFlatMapFunction();
+tableEnv.registerFunction("func", func);
+
+Table table = input
+  .flatMap(func("c")).as("a, b")
+{% endhighlight %}
+</div>
+
+<div data-lang="scala" markdown="1">
+{% highlight scala %}
+val func: TableFunction = new MyFlatMapFunction()
 
 Review comment:
   `new MyFlatMapFunction()` -> `new MyFlatMapFunction`

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