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https://issues.apache.org/jira/browse/CALCITE-3753?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Haisheng Yuan updated CALCITE-3753:
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Summary: Remove rulematch ordering and execute substitution rule first
(was: Remove rulematch ordering)
> Remove rulematch ordering and execute substitution rule first
> -------------------------------------------------------------
>
> 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: 9h 40m
> 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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