risingwave_frontend/optimizer/rule/
values_extract_project_rule.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 risingwave_common::catalog::{Field, Schema};
16use risingwave_common::types::DataType;
17
18use super::prelude::{PlanRef, *};
19use crate::expr::{ExprImpl, ExprVisitor};
20use crate::optimizer::plan_node::generic::GenericPlanRef;
21use crate::optimizer::plan_node::{LogicalProject, LogicalValues};
22use crate::optimizer::plan_visitor::ExprCorrelatedIdFinder;
23
24pub struct ValuesExtractProjectRule {}
25impl Rule<Logical> for ValuesExtractProjectRule {
26    fn apply(&self, plan: PlanRef) -> Option<PlanRef> {
27        let old_values: &LogicalValues = plan.as_logical_values()?;
28
29        let mut expr_correlated_id_finder = ExprCorrelatedIdFinder::default();
30
31        if old_values.rows().len() != 1 {
32            return None;
33        }
34
35        old_values.rows()[0]
36            .iter()
37            .for_each(|expr| expr_correlated_id_finder.visit_expr(expr));
38
39        if !expr_correlated_id_finder.has_correlated_input_ref() {
40            return None;
41        }
42
43        let new_values = LogicalValues::create(
44            vec![vec![ExprImpl::literal_bigint(1)]],
45            Schema::new(vec![Field::with_name(DataType::Int64, "$const")]),
46            old_values.ctx(),
47        );
48
49        Some(LogicalProject::create(
50            new_values,
51            old_values.rows()[0].clone(),
52        ))
53    }
54}
55
56impl ValuesExtractProjectRule {
57    pub fn create() -> BoxedRule {
58        Box::new(ValuesExtractProjectRule {})
59    }
60}
risingwave_frontend/optimizer/rule/values_extract_project_rule.rs

risingwave_frontend/optimizer/rule/
values_extract_project_rule.rs
