risingwave_frontend/optimizer/rule/
except_to_anti_join_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::{BoxedRule, Rule};
18use crate::optimizer::PlanRef;
19use crate::optimizer::plan_node::generic::Agg;
20use crate::optimizer::plan_node::{LogicalExcept, LogicalJoin, PlanTreeNode};
21use crate::optimizer::rule::IntersectToSemiJoinRule;
22
23pub struct ExceptToAntiJoinRule {}
24impl Rule for ExceptToAntiJoinRule {
25    fn apply(&self, plan: PlanRef) -> Option<PlanRef> {
26        let logical_except: &LogicalExcept = plan.as_logical_except()?;
27        let all = logical_except.all();
28        if all {
29            return None;
30        }
31
32        let inputs = logical_except.inputs();
33        let join = inputs
34            .into_iter()
35            .fold(None, |left, right| match left {
36                None => Some(right),
37                Some(left) => {
38                    let on =
39                        IntersectToSemiJoinRule::gen_null_safe_equal(left.clone(), right.clone());
40                    Some(LogicalJoin::create(left, right, JoinType::LeftAnti, on))
41                }
42            })
43            .unwrap();
44
45        Some(Agg::new(vec![], (0..join.schema().len()).collect(), join).into())
46    }
47}
48
49impl ExceptToAntiJoinRule {
50    pub fn create() -> BoxedRule {
51        Box::new(ExceptToAntiJoinRule {})
52    }
53}
risingwave_frontend/optimizer/rule/except_to_anti_join_rule.rs

risingwave_frontend/optimizer/rule/
except_to_anti_join_rule.rs
