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Posted to issues@calcite.apache.org by "Julian Hyde (Jira)" <ji...@apache.org> on 2020/11/13 05:58:00 UTC

[jira] [Resolved] (CALCITE-4383) In RelBuilder, optimize Union(all, Values, Values) to Values

     [ https://issues.apache.org/jira/browse/CALCITE-4383?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde resolved CALCITE-4383.
----------------------------------
    Fix Version/s: 1.27.0
       Resolution: Fixed

Fixed in [ff4c16d1|https://github.com/apache/calcite/commit/ff4c16d1ea2192435e543fc9572ae3a44decbf79].

> In RelBuilder, optimize Union(all, Values, Values) to Values
> ------------------------------------------------------------
>
>                 Key: CALCITE-4383
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4383
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>            Priority: Major
>             Fix For: 1.27.0
>
>
> In {{RelBuilder}}, optimize {{Union(all, Values, Values)}} to {{Values}}. Similarly optimize {{Project(Values)}} to {{Values}} if the projected expressions are all literals.
> This pattern occurs frequently, if someone writes {{SELECT 1, 'a' UNION ALL SELECT 2, 'b'}} for instance.
> Enable this rewrite with a new property {{boolean RelBuilder.Config.simplifyValues()}}, default true.



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