risingwave_frontend/optimizer/rule/
apply_over_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::expr::InputRef;
19use crate::optimizer::plan_node::{LogicalApply, LogicalFilter, LogicalOverWindow};
20use crate::utils::Condition;
21
22/// Transpose `LogicalApply` and `LogicalOverWindow`.
23///
24/// Before:
25///
26/// ```text
27///     LogicalApply
28///    /            \
29///  Domain    LogicalOverWindow
30///                  |
31///                Input
32/// ```
33///
34/// After:
35///
36/// ```text
37///    LogicalOverWindow
38///          |
39///     LogicalApply
40///    /            \
41///  Domain        Input
42/// ```
43pub struct ApplyOverWindowTransposeRule {}
44impl Rule<Logical> for ApplyOverWindowTransposeRule {
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 over_window: &LogicalOverWindow = right.as_logical_over_window()?;
51        let (window_input, mut window_functions) = over_window.clone().decompose();
52
53        if max_one_row {
54            return None;
55        }
56
57        let apply_left_len = left.schema().len();
58        let apply_left_schema = left.schema().clone();
59
60        let new_apply = LogicalApply::create(
61            left,
62            window_input,
63            JoinType::Inner,
64            Condition::true_cond(),
65            correlated_id,
66            correlated_indices,
67            false,
68        );
69
70        let new_over_window = {
71            // Shift index of window functions' `InputRef` with `apply_left_len`.
72            // Add domain
73            window_functions.iter_mut().for_each(|func| {
74                func.args
75                    .iter_mut()
76                    .for_each(|arg| arg.shift_with_offset(apply_left_len as isize));
77                func.order_by
78                    .iter_mut()
79                    .for_each(|c| c.column_index += apply_left_len);
80                func.partition_by
81                    .iter_mut()
82                    .for_each(|x| x.shift_with_offset(apply_left_len as isize));
83                // Add the domain columns to the partition by clauses.
84                func.partition_by = (0..apply_left_len)
85                    .map(|i| InputRef::new(i, apply_left_schema.fields[i].data_type()))
86                    .chain(func.partition_by.drain(..))
87                    .collect();
88            });
89
90            LogicalOverWindow::new(window_functions, new_apply)
91        };
92
93        let filter = LogicalFilter::create(new_over_window.into(), on);
94        Some(filter)
95    }
96}
97
98impl ApplyOverWindowTransposeRule {
99    pub fn create() -> BoxedRule {
100        Box::new(ApplyOverWindowTransposeRule {})
101    }
102}
risingwave_frontend/optimizer/rule/apply_over_window_transpose_rule.rs

risingwave_frontend/optimizer/rule/
apply_over_window_transpose_rule.rs
