risingwave_frontend/optimizer/plan_node/generic/
dedup.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::{Pretty, Str, XmlNode};
16use risingwave_common::catalog::{FieldDisplay, Schema};
17
18use super::{DistillUnit, GenericPlanNode, GenericPlanRef};
19use crate::OptimizerContextRef;
20use crate::optimizer::plan_node::utils::childless_record;
21use crate::optimizer::property::FunctionalDependencySet;
22
23#[derive(Debug, Clone, PartialEq, Eq, Hash)]
24pub struct Dedup<PlanRef> {
25    pub input: PlanRef,
26    /// Column indices of the columns to be deduplicated.
27    pub dedup_cols: Vec<usize>,
28}
29
30impl<PlanRef: GenericPlanRef> Dedup<PlanRef> {
31    pub fn new(input: PlanRef, dedup_cols: Vec<usize>) -> Self {
32        debug_assert!(
33            dedup_cols.iter().all(|&idx| idx < input.schema().len()),
34            "Invalid dedup keys {:?} input schema size = {}",
35            &dedup_cols,
36            input.schema().len()
37        );
38        Dedup { input, dedup_cols }
39    }
40
41    fn dedup_cols_pretty<'a>(&self) -> Pretty<'a> {
42        Pretty::Array(
43            self.dedup_cols
44                .iter()
45                .map(|i| FieldDisplay(self.input.schema().fields.get(*i).unwrap()))
46                .map(|fd| Pretty::display(&fd))
47                .collect(),
48        )
49    }
50}
51
52impl<PlanRef: GenericPlanRef> DistillUnit for Dedup<PlanRef> {
53    fn distill_with_name<'a>(&self, name: impl Into<Str<'a>>) -> XmlNode<'a> {
54        childless_record(name, vec![("dedup_cols", self.dedup_cols_pretty())])
55    }
56}
57
58impl<PlanRef: GenericPlanRef> GenericPlanNode for Dedup<PlanRef> {
59    fn schema(&self) -> Schema {
60        self.input.schema().clone()
61    }
62
63    fn stream_key(&self) -> Option<Vec<usize>> {
64        Some(self.dedup_cols.clone())
65    }
66
67    fn ctx(&self) -> OptimizerContextRef {
68        self.input.ctx()
69    }
70
71    fn functional_dependency(&self) -> FunctionalDependencySet {
72        self.input.functional_dependency().clone()
73    }
74}
risingwave_frontend/optimizer/plan_node/generic/dedup.rs

risingwave_frontend/optimizer/plan_node/generic/
dedup.rs
