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https://issues.apache.org/jira/browse/FLINK-10974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16707978#comment-16707978
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ASF GitHub Bot commented on FLINK-10974:
----------------------------------------
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
##########
File path: docs/dev/table/tableApi.md
##########
@@ -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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> Add FlatMap to TableAPI
> -----------------------
>
> Key: FLINK-10974
> URL: https://issues.apache.org/jira/browse/FLINK-10974
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: sunjincheng
> Assignee: Dian Fu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.8.0
>
>
> Add FlatMap operator to Table API as described in [Google
> doc|https://docs.google.com/document/d/1tnpxg31EQz2-MEzSotwFzqatsB4rNLz0I-l_vPa5H4Q/edit#heading=h.q23rny2iglsr].
> The usageļ¼
> {code:java}
> val res = tab
> .flatMap(fun: TableFunction) // output has columns 'a, 'b, 'c
> .select('a, 'c)
> {code}
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