[jira] [Updated] (CALCITE-482) Implement SQL and planner hints

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

     [ https://issues.apache.org/jira/browse/CALCITE-482?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde updated CALCITE-482:
--------------------------------
    Summary: Implement SQL and planner hints  (was: Implement sql and planner hints)

> Implement SQL and planner hints
> -------------------------------
>
>                 Key: CALCITE-482
>                 URL: https://issues.apache.org/jira/browse/CALCITE-482
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.21.0
>            Reporter: Vladimir Sitnikov
>            Assignee: Danny Chen
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.22.0
>
>          Time Spent: 7.5h
>  Remaining Estimate: 0h
>
> Query optimizer can never be perfect, so it makes sense to implement hints to allow user better control the execution.
> For instance: "never merge this subquery with others" (`/+ no_merge/`), "treat those tables as leading ones" (`/*+ leading */`), etc.
> Hints would enable predictable performance and the planning time would be improved as well.



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