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https://issues.apache.org/jira/browse/CALCITE-3753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17048677#comment-17048677
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Haisheng Yuan commented on CALCITE-3753:
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Hi folks, I have opened a pull request to remove the rule match importances and
its sorting.
> Remove rulematch ordering
> -------------------------
>
> Key: CALCITE-3753
> URL: https://issues.apache.org/jira/browse/CALCITE-3753
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2020-01-27-20-27-57-957.png
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> In VolcanoPlanner, some rules e.g. ProjectMergeRule, PruneEmptyRule can be
> defined as SubstitutionRule, so that we can always try to match and execute
> them first (without deferring rule call). All the other rulematches doesn't
> need to be sorted and rules can be executed in any order they matched, since
> we are going to execute all of them anyway, sooner or later. Computing and
> comparing importances cause a lot of latency.
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