risingwave_frontend/optimizer/plan_visitor/
sys_table_visitor.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::{BatchPlanVisitor, DefaultBehavior, Merge};
16use crate::optimizer::BatchPlanRoot;
17use crate::optimizer::plan_node::BatchSysSeqScan;
18use crate::optimizer::plan_visitor::PlanVisitor;
19
20#[derive(Debug, Clone, Default)]
21pub struct SysTableVisitor {}
22
23impl SysTableVisitor {
24    pub fn has_sys_table(plan: &BatchPlanRoot) -> bool {
25        let mut visitor = SysTableVisitor {};
26        visitor.visit(plan.plan.clone())
27    }
28}
29
30impl BatchPlanVisitor for SysTableVisitor {
31    type Result = bool;
32
33    type DefaultBehavior = impl DefaultBehavior<Self::Result>;
34
35    fn default_behavior() -> Self::DefaultBehavior {
36        Merge(|a, b| a | b)
37    }
38
39    fn visit_batch_sys_seq_scan(&mut self, _batch_seq_scan: &BatchSysSeqScan) -> bool {
40        true
41    }
42}