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Posted to issues@flink.apache.org by "Aljoscha Krettek (JIRA)" <ji...@apache.org> on 2014/10/14 10:36:36 UTC
[jira] [Commented] (FLINK-1159) Case style anonymous functions not
supported by Scala API
[ https://issues.apache.org/jira/browse/FLINK-1159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14170675#comment-14170675 ]
Aljoscha Krettek commented on FLINK-1159:
-----------------------------------------
Yes, I'm aware of this problem. The type checker cannot deal with it when the map function that takes a MapFunction is present. When you comment that one out you can use the "case-style" functions.
> Case style anonymous functions not supported by Scala API
> ---------------------------------------------------------
>
> Key: FLINK-1159
> URL: https://issues.apache.org/jira/browse/FLINK-1159
> Project: Flink
> Issue Type: Bug
> Reporter: Till Rohrmann
>
> In Scala it is very common to define anonymous functions of the following form
> {code}
> {
> case foo: Bar => foobar(foo)
> case _ => throw new RuntimeException()
> }
> {code}
> These case style anonymous functions are not supported yet by the Scala API. Thus, one has to write redundant code to name the function parameter.
> What works is the following pattern, but it is not intuitive for someone coming from Scala:
> {code}
> dataset.map{
> _ match{
> case foo:Bar => ...
> }
> }
> {code}
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