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https://issues.apache.org/jira/browse/FLINK-24427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17434831#comment-17434831
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Martijn Visser commented on FLINK-24427:
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[~eloisant] Were you able to make any progress yet?
> Hide Scala in flink-table-planner from API
> ------------------------------------------
>
> Key: FLINK-24427
> URL: https://issues.apache.org/jira/browse/FLINK-24427
> Project: Flink
> Issue Type: Sub-task
> Components: API / Scala, Table SQL / API, Table SQL / Planner
> Reporter: Timo Walther
> Priority: Major
>
> FLIP-32 has decoupled the planner from the API. However, the planner code
> base is still the largest Scala code base we have in Flink that we cannot
> port to Java easily.
> In order to allow arbitrary Scala versions in the user API, we suggest to
> hide the Scala version of the planner from the Scala version of the API. The
> API is mostly developed in Java and contains only a couple of classes
> implemented in Scala. Those should be easier to maintain for various Scala
> versions. The planner is already discovered via Java SPI.
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