risingwave_frontend/optimizer/rule/
apply_dedup_transpose_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_pb::plan_common::JoinType;
16
17use super::prelude::{PlanRef, *};
18use crate::optimizer::plan_node::{LogicalApply, LogicalDedup, LogicalFilter, PlanTreeNodeUnary};
19use crate::utils::Condition;
20
21/// Transpose `LogicalApply` and `LogicalDedup`.
22///
23/// Before:
24///
25/// ```text
26///     LogicalApply
27///    /            \
28///  Domain      LogicalDedup
29///                  |
30///                Input
31/// ```
32///
33/// After:
34///
35/// ```text
36///     LogicalDedup
37///          |
38///     LogicalApply
39///    /            \
40///  Domain        Input
41/// ```
42pub struct ApplyDedupTransposeRule {}
43impl Rule<Logical> for ApplyDedupTransposeRule {
44    fn apply(&self, plan: PlanRef) -> Option<PlanRef> {
45        let apply: &LogicalApply = plan.as_logical_apply()?;
46        let (left, right, on, join_type, correlated_id, correlated_indices, max_one_row) =
47            apply.clone().decompose();
48        assert_eq!(join_type, JoinType::Inner);
49        let dedup: &LogicalDedup = right.as_logical_dedup()?;
50        let dedup_cols = dedup.dedup_cols();
51        let dedup_input = dedup.input();
52
53        let apply_left_len = left.schema().len();
54
55        if max_one_row {
56            return None;
57        }
58
59        let new_apply = LogicalApply::create(
60            left,
61            dedup_input,
62            JoinType::Inner,
63            Condition::true_cond(),
64            correlated_id,
65            correlated_indices,
66            false,
67        );
68
69        let new_dedup = {
70            let mut new_dedup_cols: Vec<usize> = (0..apply_left_len).collect();
71            new_dedup_cols.extend(dedup_cols.iter().map(|key| key + apply_left_len));
72            LogicalDedup::new(new_apply, new_dedup_cols).into()
73        };
74
75        let filter = LogicalFilter::create(new_dedup, on);
76        Some(filter)
77    }
78}
79
80impl ApplyDedupTransposeRule {
81    pub fn create() -> BoxedRule {
82        Box::new(ApplyDedupTransposeRule {})
83    }
84}
risingwave_frontend/optimizer/rule/apply_dedup_transpose_rule.rs

risingwave_frontend/optimizer/rule/
apply_dedup_transpose_rule.rs
