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Posted to issues@calcite.apache.org by "Vladimir Sitnikov (JIRA)" <ji...@apache.org> on 2014/11/26 18:55:12 UTC

[jira] [Created] (CALCITE-482) Implement sql and planner hints

Vladimir Sitnikov created CALCITE-482:
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             Summary: Implement sql and planner hints
                 Key: CALCITE-482
                 URL: https://issues.apache.org/jira/browse/CALCITE-482
             Project: Calcite
          Issue Type: Bug
    Affects Versions: 1.0.0-incubating
            Reporter: Vladimir Sitnikov
            Assignee: Julian Hyde


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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