[jira] [Commented] (FLINK-990) Scala API: Compiler Hints are not forwarded

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049795#comment-14049795 ] 

ASF GitHub Bot commented on FLINK-990:
--------------------------------------

Github user tillrohrmann commented on the pull request:

    https://github.com/apache/incubator-flink/pull/51#issuecomment-47757737
  
    Changed so that all addCardinality calls will trigger an applyHints call.


> Scala API: Compiler Hints are not forwarded
> -------------------------------------------
>
>                 Key: FLINK-990
>                 URL: https://issues.apache.org/jira/browse/FLINK-990
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Till Rohrmann
>            Assignee: Till Rohrmann
>
> The Scala API contains functions such as preserve, observe, neglect, uniqueKey etc. which can be used to specify compiler hints. However, they are not forwarded to the compiler. Thus an operation:
> DataSet[A] ds = input.map{ x=> x}
> ds.preserve(x=>x, y=>y)
> which should say that the fields stay constant, does not have an effect. 



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