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https://issues.apache.org/jira/browse/FLINK-12392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16836018#comment-16836018
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Jark Wu commented on FLINK-12392:
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Sure [~twalthr], we will figure it out today.
> FlinkRelMetadataQuery does not compile with Scala 2.12
> ------------------------------------------------------
>
> Key: FLINK-12392
> URL: https://issues.apache.org/jira/browse/FLINK-12392
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.9.0
> Reporter: Chesnay Schepler
> Priority: Blocker
> Fix For: 1.9.0
>
>
> {code}
> 10:57:51.770 [ERROR]
> /home/travis/build/apache/flink/flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/plan/metadata/FlinkRelMetadataQuery.scala:52:
> error: value EMPTY in class RelMetadataQuery cannot be accessed in object
> org.apache.calcite.rel.metadata.RelMetadataQuery
> 10:57:51.770 [ERROR] Access to protected value EMPTY not permitted because
> 10:57:51.770 [ERROR] enclosing package metadata in package plan is not a
> subclass of
> 10:57:51.770 [ERROR] class RelMetadataQuery in package metadata where target
> is defined
> 10:57:51.770 [ERROR] this(RelMetadataQuery.THREAD_PROVIDERS.get,
> RelMetadataQuery.EMPTY)
> {code}
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