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https://issues.apache.org/jira/browse/FLINK-990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049795#comment-14049795
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ASF GitHub Bot commented on FLINK-990:
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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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