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https://issues.apache.org/jira/browse/CALCITE-4360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17222742#comment-17222742
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Liya Fan commented on CALCITE-4360:
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[~Chunwei Lei] Thanks for the investigation.
The process is a little tricky. However, I wish we could add some comments to
the related code, so the code reader will no longer be confused.
> Apply SubstitutionRule first in top-down driven rule apply
> ----------------------------------------------------------
>
> Key: CALCITE-4360
> URL: https://issues.apache.org/jira/browse/CALCITE-4360
> Project: Calcite
> Issue Type: Improvement
> Reporter: Chunwei Lei
> Assignee: Chunwei Lei
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2020-10-27-21-55-55-155.png
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> In the current implementation, TopDownRuleQueue adds substitute rules in the
> end wrongly. The SubstitutionRule should be executed first.
> !image-2020-10-27-21-55-55-155.png!
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