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::prelude::{PlanRef, *};
18use crate::optimizer::plan_node::{LogicalApply, LogicalFilter, LogicalHopWindow};
19use crate::utils::Condition;
20
21/// Transpose `LogicalApply` and `LogicalHopWindow`.
22///
23/// Before:
24///
25/// ```text
26///     LogicalApply
27///    /            \
28///  Domain      LogicalHopWindow
29///                  |
30///                Input
31/// ```
32///
33/// After:
34///
35/// ```text
36///    LogicalHopWindow
37///          |
38///    LogicalApply
39///    /            \
40///  Domain        Input
41/// ```
42pub struct ApplyHopWindowTransposeRule {}
43impl Rule<Logical> for ApplyHopWindowTransposeRule {
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        let hop_window: &LogicalHopWindow = right.as_logical_hop_window()?;
49        assert_eq!(join_type, JoinType::Inner);
50
51        if !hop_window.output_indices_are_trivial() {
52            return None;
53        }
54
55        let (hop_window_input, time_col, window_slide, window_size, window_offset, _output_indices) =
56            hop_window.clone().into_parts();
57
58        let apply_left_len = left.schema().len() as isize;
59
60        if max_one_row {
61            return None;
62        }
63
64        let new_apply = LogicalApply::create(
65            left,
66            hop_window_input,
67            JoinType::Inner,
68            Condition::true_cond(),
69            correlated_id,
70            correlated_indices,
71            false,
72        );
73
74        let new_hop_window = LogicalHopWindow::create(
75            new_apply,
76            time_col.clone_with_offset(apply_left_len),
77            window_slide,
78            window_size,
79            window_offset,
80        );
81
82        let filter = LogicalFilter::create(new_hop_window, on);
83        Some(filter)
84    }
85}
86
87impl ApplyHopWindowTransposeRule {
88    pub fn create() -> BoxedRule {
89        Box::new(ApplyHopWindowTransposeRule {})
90    }
91}
risingwave_frontend/optimizer/rule/apply_hop_window_transpose_rule.rs

risingwave_frontend/optimizer/rule/
apply_hop_window_transpose_rule.rs
