risingwave_frontend/optimizer/rule/
apply_union_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 itertools::Itertools;
16
17use super::{BoxedRule, Rule};
18use crate::optimizer::PlanRef;
19use crate::optimizer::plan_node::{LogicalApply, LogicalUnion, PlanTreeNode, PlanTreeNodeBinary};
20
21/// Transpose `LogicalApply` and `LogicalUnion`.
22///
23/// Before:
24///
25/// ```text
26///     LogicalApply
27///    /            \
28///  Domain      LogicalUnion
29///                /      \
30///               T1     T2
31/// ```
32///
33/// After:
34///
35/// ```text
36///           LogicalUnion
37///         /            \
38///  LogicalApply     LogicalApply
39///   /      \           /      \
40/// Domain   T1        Domain   T2
41/// ```
42pub struct ApplyUnionTransposeRule {}
43impl Rule for ApplyUnionTransposeRule {
44    fn apply(&self, plan: PlanRef) -> Option<PlanRef> {
45        let apply: &LogicalApply = plan.as_logical_apply()?;
46        if apply.max_one_row() {
47            return None;
48        }
49        let left = apply.left();
50        let right = apply.right();
51        let union: &LogicalUnion = right.as_logical_union()?;
52
53        let new_inputs = union
54            .inputs()
55            .into_iter()
56            .map(|input| apply.clone_with_left_right(left.clone(), input).into())
57            .collect_vec();
58        Some(union.clone_with_inputs(&new_inputs))
59    }
60}
61
62impl ApplyUnionTransposeRule {
63    pub fn create() -> BoxedRule {
64        Box::new(ApplyUnionTransposeRule {})
65    }
66}
risingwave_frontend/optimizer/rule/apply_union_transpose_rule.rs

risingwave_frontend/optimizer/rule/
apply_union_transpose_rule.rs
