[jira] [Created] (CALCITE-4386) Support RelShuttle visit specific logical operators

["xzh_dz (Jira)" <ji...@apache.org>]

xzh_dz created CALCITE-4386:
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             Summary: Support RelShuttle visit specific logical operators
                 Key: CALCITE-4386
                 URL: https://issues.apache.org/jira/browse/CALCITE-4386
             Project: Calcite
          Issue Type: Wish
            Reporter: xzh_dz


In the current implementation, some operators, such as `LogicalProject` and `LogicalFilter`, can be directly accessed by `Relshuttle`, while others, such as `LogicalCalc` and `LogicalWindow`, cannot be accessed directly. `RelShuttle` is a very important tool class. Usually, we will do equivalent transformation of relational algebra in the process of relational algebra optimization. This PR will cover the method of the operator visit `RelShuttle`, and the specific operator can be accessed directly by visiting `RelNode`.



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