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https://issues.apache.org/jira/browse/CALCITE-3927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17084302#comment-17084302
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Xiening Dai commented on CALCITE-3927:
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Can we come up with a test case? Just try to assess the impact of this in real
world scenarios.
> RelSubset is not fired for rule when set gets merged
> ----------------------------------------------------
>
> Key: CALCITE-3927
> URL: https://issues.apache.org/jira/browse/CALCITE-3927
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> In VolcanoPlanner, when set gets merged, planner fires rules again for
> RelNodes in both sets, but not for RelSubset. We might miss something because
> of this.
> If all the logical transformation rules and physical implementation rules are
> separated out in different stage and physical rules don't do logical work, we
> might be OK. But the reality is that all the things are mixed together at the
> moment.
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