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Posted to issues@calcite.apache.org by "Julian Hyde (Jira)" <ji...@apache.org> on 2020/11/07 07:27:00 UTC

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

Julian Hyde created CALCITE-4383:
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             Summary: 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


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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