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https://issues.apache.org/jira/browse/CALCITE-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17087980#comment-17087980
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Julian Hyde commented on CALCITE-3939:
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Can you clarify the description? It's not clear whether you consider "more" to
be desired or undesired behavior.
> more auto pruning rules after SubstitutionRule is introduced
> ------------------------------------------------------------
>
> Key: CALCITE-3939
> URL: https://issues.apache.org/jira/browse/CALCITE-3939
> Project: Calcite
> Issue Type: Improvement
> Reporter: Botong Huang
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> UnionEliminatorRule and ProjectRemoveRule are both pruning rules for a
> RelNode. They can also become SubstitutionRule with autoprune enabled
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