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Posted to issues@calcite.apache.org by "xzh_dz (Jira)" <ji...@apache.org> on 2020/11/13 07:35:00 UTC

[jira] [Created] (CALCITE-4400) A tool method explain Calc operator

xzh_dz created CALCITE-4400:
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             Summary: A tool method explain Calc operator
                 Key: CALCITE-4400
                 URL: https://issues.apache.org/jira/browse/CALCITE-4400
             Project: Calcite
          Issue Type: Wish
            Reporter: xzh_dz


`Calc` is an operator combining `Project` and `Filter`. In a project development, `Calc` operator is usually used to simplify the operator of `Project` and `Filter`, and facilitate the optimization of relational algebra. Usually, `Calc` operator is needed to process `Project` and `Filter` information.Explain Calc operator is often needed in materialized view recognition.A tool  is needed to explain Calc to get `Project` (RexNodes) and `Filter` (RexNode). In relation algebra optimization, it will be very convenient to process `Calc` operator.



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