[jira] [Commented] (FLINK-10973) Add Map operator to Table API

[ASF GitHub Bot (JIRA)]

    [ 
https://issues.apache.org/jira/browse/FLINK-10973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16701488#comment-16701488
 ] 

ASF GitHub Bot commented on FLINK-10973:
----------------------------------------

dianfu 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_r236968724
 
 

 ##########
 File path: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/table.scala
 ##########
 @@ -999,6 +999,94 @@ class Table(
     new OverWindowedTable(this, overWindows.toArray)
   }
 
+  /**
+    * Performs a map operation with an user-defined scalar function or 
built-in scalar functions.
+    * The output will be flattened if the output type is a composite type.
+    *
+    * Scala Example:
+    * {{{
+    *   class MyMapFunction extends ScalarFunction {
+    *     def eval(str: String): Row = {
+    *       Row.of(str, str)
+    *     }
+    *
+    *     def getResultType(signature: Array[Class[_]]): TypeInformation[_] =
+    *       Types.ROW(Types.STRING, Types.STRING)
+    *   }
+    *
+    *   val func = new MyMapFunction()
+    *   table.map(func('c))
+    * }}}
+    *
+    * Java Example:
+    * {{{
+    *   class MyMapFunction extends ScalarFunction {
+    *     public Row eval(String str) {
+    *       return Row.of(str, str);
+    *     }
+    *
+    *     public TypeInformation getResultType(Class[] signature) {
+    *       return new RowTypeInfo(BasicTypeInfo.STRING_TYPE_INFO, 
BasicTypeInfo.STRING_TYPE_INFO);
 
 Review comment:
   What about using the `Types` from `flink-core` module? The scala `Types` is 
just a wrapper of the java version `Types` from `flink-core`.

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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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