risingwave_frontend/optimizer/plan_node/generic/
recursive_union.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 pretty_xmlish::StrAssocArr;
16use risingwave_common::catalog::Schema;
17
18use super::{GenericPlanNode, GenericPlanRef, impl_distill_unit_from_fields};
19use crate::OptimizerContextRef;
20use crate::binder::ShareId;
21use crate::optimizer::property::FunctionalDependencySet;
22
23/// `RecursiveUnion` returns the union of the rows of its inputs.
24/// note: if `all` is false, it needs to eliminate duplicates.
25#[derive(Debug, Clone, PartialEq, Eq, Hash)]
26pub struct RecursiveUnion<PlanRef> {
27    pub id: ShareId,
28    pub base: PlanRef,
29    pub recursive: PlanRef,
30}
31
32impl<PlanRef: GenericPlanRef> GenericPlanNode for RecursiveUnion<PlanRef> {
33    fn functional_dependency(&self) -> FunctionalDependencySet {
34        self.recursive.functional_dependency().clone()
35    }
36
37    fn schema(&self) -> Schema {
38        self.recursive.schema().clone()
39    }
40
41    fn stream_key(&self) -> Option<Vec<usize>> {
42        let fields_len = self.base.schema().len();
43        let base = self.base.stream_key();
44        if let Some(base) = base {
45            let mut base = base.to_vec();
46            base.push(fields_len);
47            Some(base)
48        } else {
49            None
50        }
51    }
52
53    fn ctx(&self) -> OptimizerContextRef {
54        self.recursive.ctx()
55    }
56}
57
58impl<PlanRef: GenericPlanRef> RecursiveUnion<PlanRef> {
59    pub fn fields_pretty<'a>(&self) -> StrAssocArr<'a> {
60        vec![]
61    }
62}
63
64impl_distill_unit_from_fields!(RecursiveUnion, GenericPlanRef);
risingwave_frontend/optimizer/plan_node/generic/recursive_union.rs

risingwave_frontend/optimizer/plan_node/generic/
recursive_union.rs
