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https://issues.apache.org/jira/browse/FLINK-10973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16698383#comment-16698383
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ASF GitHub Bot commented on FLINK-10973:
----------------------------------------
hequn8128 commented on a change in pull request #7167: [FLINK-10973] [table]
Add support for map to table API
URL: https://github.com/apache/flink/pull/7167#discussion_r236103235
##########
File path: docs/dev/table/tableApi.md
##########
@@ -1682,6 +1682,34 @@ The `OverWindow` defines a range of rows over which
aggregates are computed. `Ov
{% top %}
+### Map
+
+Map performs a map operation with an user-defined function. The output will be
flattened
+if the output type is 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 = new MyMapFunction()
Review comment:
val func = new MyMapFunction() => val func: ScalarFunction = new
MyMapFunction() ？
To tell user that func is a `ScalarFunction`.
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> Add Map operator to Table API
> -----------------------------
>
> Key: FLINK-10973
> URL: https://issues.apache.org/jira/browse/FLINK-10973
> 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 Map operator to Table API as described in [Google
> doc|https://docs.google.com/document/d/1tnpxg31EQz2-MEzSotwFzqatsB4rNLz0I-l_vPa5H4Q/edit#heading=h.q23rny2iglsr]
> The usage：
> {code:java}
> val res = tab
> .map(fun: ScalarFunction) // output has columns 'a, 'b, 'c
> .select('a, 'c)
> {code}
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