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https://issues.apache.org/jira/browse/FLINK-6788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16040642#comment-16040642
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Fabian Hueske commented on FLINK-6788:
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I think it is fine to remove these classes. Their original intend was to be
able to put different APIs on top of the optimizer. I think by now, it is quite
unlikely that this will ever be done and if it would be done, they would
probably need to be rewritten anyway.
> Remove unused GenericFlatTypePostPass/AbstractSchema class
> ----------------------------------------------------------
>
> Key: FLINK-6788
> URL: https://issues.apache.org/jira/browse/FLINK-6788
> Project: Flink
> Issue Type: Improvement
> Components: Optimizer
> Affects Versions: 1.4.0
> Reporter: Chesnay Schepler
> Priority: Trivial
>
> The {{AbstractSchema}} and {{GenericFlatTypePostPass}} classes in
> {{org.apache.flink.optimizer.postpass}} are unused and could maybe be removed.
> [~fhueske] your thoughts?
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