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https://issues.apache.org/jira/browse/FLINK-16119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17336305#comment-17336305
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Flink Jira Bot commented on FLINK-16119:
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This issue was labeled "stale-major" 7 ago and has not received any updates so
it is being deprioritized. If this ticket is actually Major, please raise the
priority and ask a committer to assign you the issue or revive the public
discussion.
> Port base RelNode classes from Scala to Java
> --------------------------------------------
>
> Key: FLINK-16119
> URL: https://issues.apache.org/jira/browse/FLINK-16119
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Legacy Planner, Table SQL / Planner
> Reporter: Hequn Cheng
> Priority: Major
> Labels: stale-major
>
> Currently, when adding new Flink RelNodes, we have to write a Scala one due
> to the problem that we can't use the implemented methods of a Scala trait
> from Java([see
> details|https://alvinalexander.com/scala/how-to-wrap-scala-traits-used-accessed-java-classes-methods]).
> Take DataStreamCorrelate as an example, it extends both CommonCorrelate and
> DataStreamRel and we can't convert DataStreamCorrelate to Java directly.
> It would be great if we can convert these base RelNode
> classes(CommonCorrelate, DataStreamRel, etc) from Scala to Java so that we
> can add new Java RelNodes and convert the existed RelNodes to Java.
> CC [~twalthr]
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