[jira] [Commented] (CALCITE-3781) HintStrategy can specify excluded rules for planner

["Julian Hyde (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-3781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17033856#comment-17033856 ] 

Julian Hyde commented on CALCITE-3781:
--------------------------------------

It seems a bit strange to have the planner exclude rules based on the {{rels[0]}} of the match.

Do you think it would be more natural for the rule match or rule call to make the decision? It can see all of the rels, not just {{rels[0]}}.

Also, would some rules be excluded outright due to the presence of certain hints? If so, they could be removed from the program before planning even starts.

> HintStrategy can specify excluded rules for planner
> ---------------------------------------------------
>
>                 Key: CALCITE-3781
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3781
>             Project: Calcite
>          Issue Type: Sub-task
>          Components: core
>    Affects Versions: 1.21.0
>            Reporter: Danny Chen
>            Assignee: Danny Chen
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.22.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> It is efficient to support exclude rules explicitly for some hints, i.e. USE_MERGE, NO_USE_HASH.



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