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https://issues.apache.org/jira/browse/FLINK-5829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15943938#comment-15943938
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Haohui Mai commented on FLINK-5829:
-----------------------------------

Unfortunately it seems that it is infeasible to inherit and forward the calls 
because Calcite declares most of the methods as package local methods. It seems 
that Calcite intentionally keeps the class as a package local class.

Another option is to defer the functionality of unregistering tables until 
Calcite provides the API. We can open a jira in Calcite and get it fixed in 
Calcite 1.13. However, given the release schedule, it seems to me that the 
functionality will be deferred to Flink 1.4.

[~twalthr] does it sound okay to you? What do you think?

> Bump Calcite version to 1.12 once available
> -------------------------------------------
>
>                 Key: FLINK-5829
>                 URL: https://issues.apache.org/jira/browse/FLINK-5829
>             Project: Flink
>          Issue Type: Task
>          Components: Table API & SQL
>            Reporter: Fabian Hueske
>            Assignee: Haohui Mai
>
> Once Calcite 1.12 is release we should update to remove some copied classes. 



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