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https://issues.apache.org/jira/browse/CALCITE-2352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502341#comment-16502341
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Kevin Risden commented on CALCITE-2352:
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I had looked at upgrading Checkstyle to 8.x and the latest we could go to was
7.x due to hydromatic-toolbox as [~laurentgo] pointed out. This did generate a
bunch of checkstyle violations due to new versions of Checkstyle.
The checkstyle plugin doesn't need to be updated to update checkstyle itself.
https://maven.apache.org/plugins/maven-checkstyle-plugin/examples/upgrading-checkstyle.html
> Upgrade checkstyle to support Java8 lambdas
> -------------------------------------------
>
> Key: CALCITE-2352
> URL: https://issues.apache.org/jira/browse/CALCITE-2352
> Project: Calcite
> Issue Type: Bug
> Components: avatica
> Reporter: Laurent Goujon
> Priority: Major
>
> Version of checkstyle used by Avatica (5.7) doesn't support constructs from
> Java8 like lambdas and static methods in interfaces.
> This would result in lots of small changes to adjust to the stricter rules.
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