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https://issues.apache.org/jira/browse/FLINK-25474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17466462#comment-17466462
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godfrey he commented on FLINK-25474:
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[~MartijnVisser], 1.13 & 1.14 also has similar problem
> Idea Scala plugin can not compile RexExplainUtil
> -------------------------------------------------
>
> Key: FLINK-25474
> URL: https://issues.apache.org/jira/browse/FLINK-25474
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Reporter: godfrey he
> Assignee: godfrey he
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.15.0
>
> Attachments: image-2021-12-29-15-16-50-513.png,
> image-2021-12-29-15-20-18-794.png
>
>
> Idea version: 2021.2.3
> Scala version: 2.11.12
> There are some errors in {{RexExplainUtil}} and many classes which use the
> methods in {{RexExplainUtil}}.
> NOTES: those class can be compiled and executed successfully
> !image-2021-12-29-15-16-50-513.png!
> !image-2021-12-29-15-20-18-794.png!
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