dssysolyatin commented on PR #4620:
URL: https://github.com/apache/calcite/pull/4620#issuecomment-3529529480

   @xuzifu666 I approved your PR, but it doesn’t really make sense to merge it 
as it is. The reason is that `AbstractRelNode` already has a default `accept` 
implementation that calls `RelShuttle.visit(RelNode other)` and your change 
does nothing.
   
   If you decide to add visitor method for `LogicalSnaphot`, be also aware of 
behaviour, that if user class: `X which extends LogicalSnapshot` and class `Y 
which extends Snapshot`. `X` will call `RelShuttle.visit(LogicalSnapshot)` and 
`Y` will call `RelShuttle.visit(RelNode other)`. It also should be documented 
that user aware of it


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