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https://issues.apache.org/jira/browse/CALCITE-4638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17357722#comment-17357722
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Julian Hyde commented on CALCITE-4638:
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As part of this change, can we improve the javadoc for {{interface
TransformationRule}}? The current javadoc is somewhat circular, and doesn't
explain why we want the concept of a transformation rule. The name isn't
particularly helpful either, because all RelNode rules "transform".
> Volcano top-down optimizer failed to recognize transformation rule correctly
> -----------------------------------------------------------------------------
>
> Key: CALCITE-4638
> URL: https://issues.apache.org/jira/browse/CALCITE-4638
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> In VolcanoPlanner.isTransformationRule, if the rule is a physical
> implementation rule, it may be recognized as a transformation rule
> incorrectly.
> See discussion in mailing list:
> https://lists.apache.org/thread.html/r362da53656b80b727c72cc6e4b807c5b1eccb15a0aa6fec5f6bbe91e%40%3Cdev.calcite.apache.org%3E
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