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https://issues.apache.org/jira/browse/CALCITE-7218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18029270#comment-18029270
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Zhen Chen commented on CALCITE-7218:
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[~julianhyde] If you have time, please review this JIRA PR for me. I look
forward to your reply.
> ArrowSet needs to maintain a minimal set of functional dependencies
> ---------------------------------------------------------------------
>
> Key: CALCITE-7218
> URL: https://issues.apache.org/jira/browse/CALCITE-7218
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.40.0
> Reporter: Zhen Chen
> Priority: Major
> Labels: pull-request-available
>
> Currently, ArrowSet may contain redundant functional dependencies. For
> example:
> If both "(a, b) -> (c)" and "(b) -> (c)" are present, the former can be
> removed since it is implied by the latter.
> We should implement a best-effort minimization algorithm that:
> # Removes redundant FDs where a subset of determinants already implies the
> same dependents
> # Handles the most common cases rather than achieving perfect minimization
> # Maintains functional correctness while improving storage efficiency
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