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https://issues.apache.org/jira/browse/CALCITE-4002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17107710#comment-17107710
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Julian Hyde commented on CALCITE-4002:
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Might be controversial. You seem to have purist philosophy that separates
logical and physical nodes and rules but not everyone subscribes to that
approach.
> Add security check to make sure TransformationRule doesn't generate
> PhysicalNode
> --------------------------------------------------------------------------------
>
> Key: CALCITE-4002
> URL: https://issues.apache.org/jira/browse/CALCITE-4002
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> Right now, it is not allowed to generate {{PhysicalNode}} in logical
> {{TransformationRule}}, but it is just a contract, not being enforced. Add a
> security check to make sure we throw if a {{PhysicalNode}} is generated in
> {{VolcanoPlanner}}.
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