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https://issues.apache.org/jira/browse/FLINK-20319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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godfrey he updated FLINK-20319:
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Component/s: (was: Table SQL / Planner)
Table SQL / API
> Improving the visitor pattern for operations
> --------------------------------------------
>
> Key: FLINK-20319
> URL: https://issues.apache.org/jira/browse/FLINK-20319
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Affects Versions: 1.11.2
> Reporter: Ingo Bürk
> Priority: Minor
>
> The *OperationVisitor interfaces (which are not public API) don't always
> implement the visitor pattern correctly, and some things which would be
> useful are missing. Some things I discovered:
> # CatalogSinkModifyOperation doesn't accept() its child. It's likely that
> others have this problem as well, but I haven't checked further.
> # The base Operation interface doesn't have an accept() method at all.
> Potentially intentional since this interface actually is public API?
> # There's a catch-all QueryOperationVisitor#visit(QueryOperation other) that
> would be nice to split up into its subtypes (PlannerQueryOperation, …)
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