risingwave_frontend/optimizer/rule/
apply_hop_window_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, LogicalFilter, LogicalHopWindow};
20use crate::utils::Condition;
21
22/// Transpose `LogicalApply` and `LogicalHopWindow`.
23///
24/// Before:
25///
26/// ```text
27///     LogicalApply
28///    /            \
29///  Domain      LogicalHopWindow
30///                  |
31///                Input
32/// ```
33///
34/// After:
35///
36/// ```text
37///    LogicalHopWindow
38///          |
39///    LogicalApply
40///    /            \
41///  Domain        Input
42/// ```
43pub struct ApplyHopWindowTransposeRule {}
44impl Rule for ApplyHopWindowTransposeRule {
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        let hop_window: &LogicalHopWindow = right.as_logical_hop_window()?;
50        assert_eq!(join_type, JoinType::Inner);
51
52        if !hop_window.output_indices_are_trivial() {
53            return None;
54        }
55
56        let (hop_window_input, time_col, window_slide, window_size, window_offset, _output_indices) =
57            hop_window.clone().into_parts();
58
59        let apply_left_len = left.schema().len() as isize;
60
61        if max_one_row {
62            return None;
63        }
64
65        let new_apply = LogicalApply::create(
66            left,
67            hop_window_input,
68            JoinType::Inner,
69            Condition::true_cond(),
70            correlated_id,
71            correlated_indices,
72            false,
73        );
74
75        let new_hop_window = LogicalHopWindow::create(
76            new_apply,
77            time_col.clone_with_offset(apply_left_len),
78            window_slide,
79            window_size,
80            window_offset,
81        );
82
83        let filter = LogicalFilter::create(new_hop_window, on);
84        Some(filter)
85    }
86}
87
88impl ApplyHopWindowTransposeRule {
89    pub fn create() -> BoxedRule {
90        Box::new(ApplyHopWindowTransposeRule {})
91    }
92}
risingwave_frontend/optimizer/rule/apply_hop_window_transpose_rule.rs

risingwave_frontend/optimizer/rule/
apply_hop_window_transpose_rule.rs
