risingwave_frontend/optimizer/plan_node/
expr_visitable.rs

1// Copyright 2025 RisingWave Labs
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15use super::*;
16
17/// Vistis expressions in a `PlanRef`.
18/// To visit recursively, call `visit_exprs_recursive` on [`VisitExprsRecursive`].
19pub trait ExprVisitable {
20    fn visit_exprs(&self, _v: &mut dyn ExprVisitor) {}
21}
22
23impl ExprVisitable for PlanRef {
24    fn visit_exprs(&self, v: &mut dyn ExprVisitor) {
25        self.deref().visit_exprs(v);
26    }
27}