[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=16701448#comment-16701448
 ] 

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

sunjincheng121 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_r236952937
 
 

 ##########
 File path: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/ProjectionTranslator.scala
 ##########
 @@ -418,4 +418,30 @@ object ProjectionTranslator {
       case e: Expression => e
     }
   }
+
+
+  /**
+    * Unwrap a Call to ScalarFunctionCall, TableFunctionCall, AggFunctionCall 
or the built-in
+    * expression representation.
+    *
+    * @param field    the expression to unwrap
+    * @param tableEnv the TableEnvironment
+    * @return the unwrapped expression
+    */
+  def unwrap(
+      field: Expression,
+      tableEnv: TableEnvironment): Expression = {
+    field match {
+      case Alias(child, name, extraNames) =>
 
 Review comment:
   Alias(child, name, extraNames) -> Alias(child, _, _) because name and 
extraNames never used.

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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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