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Posted to issues@calcite.apache.org by "Stamatis Zampetakis (Jira)" <ji...@apache.org> on 2020/08/06 08:39:00 UTC

[jira] [Commented] (CALCITE-4160) Add configuration to retain ORDER BY in sub-query

    [ https://issues.apache.org/jira/browse/CALCITE-4160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17172136#comment-17172136 ] 

Stamatis Zampetakis commented on CALCITE-4160:
----------------------------------------------

Hi [~Aron.tao] can you explain why do you need to retain the ORDER BY in the sub-query?

> Add configuration to retain ORDER BY in sub-query
> -------------------------------------------------
>
>                 Key: CALCITE-4160
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4160
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Jiatao Tao
>            Assignee: Jiatao Tao
>            Priority: Minor
>
> Pre discussion see in 
> https://issues.apache.org/jira/browse/CALCITE-2798
> https://issues.apache.org/jira/browse/CALCITE-3664
> IMO, we should at least provide a configuration about this. People use Calcite most for its optimizer, and this info users may care, How it executed is by the engine, but users should know this in the plan.
>  



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