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https://issues.apache.org/jira/browse/FLINK-5078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15670189#comment-15670189
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Fabian Hueske commented on FLINK-5078:
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+1 That's a good idea!
> Introduce annotations for classes copied from Calcite
> -----------------------------------------------------
>
> Key: FLINK-5078
> URL: https://issues.apache.org/jira/browse/FLINK-5078
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
>
> We have already copied several classes from Calcite because of missing
> features or bugs. In order to track those classes, update them when bumping
> up the version, or check if they became obsolete it might be useful to
> introduce a special annotation to mark those classes. Maybe with an
> additional standardized comment format which lines have been modified.
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