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Posted to issues@calcite.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/11/14 03:03:00 UTC

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

     [ https://issues.apache.org/jira/browse/CALCITE-4400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated CALCITE-4400:
------------------------------------
    Labels: pull-request-available  (was: )

> 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
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> `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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