risingwave_frontend/optimizer/rule/
apply_to_join_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 super::{BoxedRule, Rule};
16use crate::optimizer::PlanRef;
17use crate::optimizer::plan_node::{LogicalApply, LogicalJoin};
18
19/// Convert `LogicalApply` to `LogicalJoin` if it is uncorrelated and doesn't require max one row
20/// restriction.
21pub struct ApplyToJoinRule {}
22impl Rule for ApplyToJoinRule {
23    fn apply(&self, plan: PlanRef) -> Option<PlanRef> {
24        let apply: &LogicalApply = plan.as_logical_apply()?;
25        let (left, right, on, join_type, _correlated_id, correlated_indices, max_one_row) =
26            apply.clone().decompose();
27
28        if !max_one_row && correlated_indices.is_empty() {
29            Some(LogicalJoin::new(left, right, join_type, on).into())
30        } else {
31            None
32        }
33    }
34}
35
36impl ApplyToJoinRule {
37    pub fn create() -> BoxedRule {
38        Box::new(ApplyToJoinRule {})
39    }
40}

risingwave_frontend/optimizer/rule/apply_to_join_rule.rs

risingwave_frontend/optimizer/rule/
apply_to_join_rule.rs