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https://issues.apache.org/jira/browse/CALCITE-4386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17229641#comment-17229641
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Haisheng Yuan commented on CALCITE-4386:
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AbstractRelNode has default implementation. Do we really need the PR?
> Support RelShuttle visit specific logical operators
> ---------------------------------------------------
>
> Key: CALCITE-4386
> URL: https://issues.apache.org/jira/browse/CALCITE-4386
> Project: Calcite
> Issue Type: Wish
> Reporter: xzh_dz
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In the current implementation, some operators, such as `LogicalProject` and
> `LogicalFilter`, can be directly accessed by `Relshuttle`, while others, such
> as `LogicalCalc` and `LogicalWindow`, cannot be accessed directly.
> `RelShuttle` is a very important tool class. Usually, we will do equivalent
> transformation of relational algebra in the process of relational algebra
> optimization. This PR will cover the method of the operator visit
> `RelShuttle`, and the specific operator can be accessed directly by visiting
> `RelNode`.
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