[jira] [Commented] (CALCITE-3753) Always try to match and execute substitution rule first and remove rulematch ordering

["Stamatis Zampetakis (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-3753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17020879#comment-17020879 ] 

Stamatis Zampetakis commented on CALCITE-3753:
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Hi [~hyuan], just to be sure I understand. Are you proposing to drop importance from the subsets and replace the rule queue with an unordered data structure? 

> Always try to match and execute substitution rule first and 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
>
> 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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