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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