Benchao Li created CALCITE-5715:
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Summary: 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
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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