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::{BoxedRule, Rule};
18use crate::optimizer::PlanRef;
19use crate::optimizer::plan_node::{LogicalApply, LogicalDedup, LogicalFilter, PlanTreeNodeUnary};
20use crate::utils::Condition;
21
22/// Transpose `LogicalApply` and `LogicalDedup`.
23///
24/// Before:
25///
26/// ```text
27///     LogicalApply
28///    /            \
29///  Domain      LogicalDedup
30///                  |
31///                Input
32/// ```
33///
34/// After:
35///
36/// ```text
37///     LogicalDedup
38///          |
39///     LogicalApply
40///    /            \
41///  Domain        Input
42/// ```
43pub struct ApplyDedupTransposeRule {}
44impl Rule for ApplyDedupTransposeRule {
45    fn apply(&self, plan: PlanRef) -> Option<PlanRef> {
46        let apply: &LogicalApply = plan.as_logical_apply()?;
47        let (left, right, on, join_type, correlated_id, correlated_indices, max_one_row) =
48            apply.clone().decompose();
49        assert_eq!(join_type, JoinType::Inner);
50        let dedup: &LogicalDedup = right.as_logical_dedup()?;
51        let dedup_cols = dedup.dedup_cols();
52        let dedup_input = dedup.input();
53
54        let apply_left_len = left.schema().len();
55
56        if max_one_row {
57            return None;
58        }
59
60        let new_apply = LogicalApply::create(
61            left,
62            dedup_input,
63            JoinType::Inner,
64            Condition::true_cond(),
65            correlated_id,
66            correlated_indices,
67            false,
68        );
69
70        let new_dedup = {
71            let mut new_dedup_cols: Vec<usize> = (0..apply_left_len).collect();
72            new_dedup_cols.extend(dedup_cols.iter().map(|key| key + apply_left_len));
73            LogicalDedup::new(new_apply, new_dedup_cols).into()
74        };
75
76        let filter = LogicalFilter::create(new_dedup, on);
77        Some(filter)
78    }
79}
80
81impl ApplyDedupTransposeRule {
82    pub fn create() -> BoxedRule {
83        Box::new(ApplyDedupTransposeRule {})
84    }
85}
risingwave_frontend/optimizer/rule/apply_dedup_transpose_rule.rs

risingwave_frontend/optimizer/rule/
apply_dedup_transpose_rule.rs
