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https://issues.apache.org/jira/browse/CALCITE-5715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17724251#comment-17724251
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Benchao Li commented on CALCITE-5715:
-------------------------------------
All existing tests pass after this change:
https://github.com/apache/calcite/pull/3216
> Prune old nodes after projection merging in ProjectionMergeRule
> ---------------------------------------------------------------
>
> Key: CALCITE-5715
> URL: https://issues.apache.org/jira/browse/CALCITE-5715
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.34.0
> Reporter: Benchao Li
> Priority: Major
>
> We already have many similar usages (prune old nodes) to reduce the search
> scope, I propose to also add this for {{ProjectionMergeRule}}. Do you have
> any concerns about this?
> The reason I propose to do this optimization for {{ProjectionMergeRule}} is
> that I met a problem that two sets will point to each other after projection
> merging, and the planner will run into dead loop. (It's hard to show the
> details, I haven't got a simple reproducible demo yet)
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