risingwave_frontend/optimizer/rule/
intersect_to_semi_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_common::types::DataType::Boolean;
16use risingwave_common::util::iter_util::ZipEqDebug;
17use risingwave_pb::plan_common::JoinType;
18
19use super::{BoxedRule, Rule};
20use crate::expr::{ExprImpl, ExprType, FunctionCall, InputRef};
21use crate::optimizer::PlanRef;
22use crate::optimizer::plan_node::generic::Agg;
23use crate::optimizer::plan_node::{LogicalIntersect, LogicalJoin, PlanTreeNode};
24
25pub struct IntersectToSemiJoinRule {}
26impl Rule for IntersectToSemiJoinRule {
27    fn apply(&self, plan: PlanRef) -> Option<PlanRef> {
28        let logical_intersect: &LogicalIntersect = plan.as_logical_intersect()?;
29        let all = logical_intersect.all();
30        if all {
31            return None;
32        }
33
34        let inputs = logical_intersect.inputs();
35        let join = inputs
36            .into_iter()
37            .fold(None, |left, right| match left {
38                None => Some(right),
39                Some(left) => {
40                    let on =
41                        IntersectToSemiJoinRule::gen_null_safe_equal(left.clone(), right.clone());
42                    Some(LogicalJoin::create(left, right, JoinType::LeftSemi, on))
43                }
44            })
45            .unwrap();
46
47        Some(Agg::new(vec![], (0..join.schema().len()).collect(), join).into())
48    }
49}
50
51impl IntersectToSemiJoinRule {
52    pub(crate) fn gen_null_safe_equal(left: PlanRef, right: PlanRef) -> ExprImpl {
53        let arms = (left
54            .schema()
55            .fields()
56            .iter()
57            .zip_eq_debug(right.schema().fields())
58            .enumerate())
59        .map(|(i, (left_field, right_field))| {
60            ExprImpl::FunctionCall(Box::new(FunctionCall::new_unchecked(
61                ExprType::IsNotDistinctFrom,
62                vec![
63                    ExprImpl::InputRef(Box::new(InputRef::new(i, left_field.data_type()))),
64                    ExprImpl::InputRef(Box::new(InputRef::new(
65                        i + left.schema().len(),
66                        right_field.data_type(),
67                    ))),
68                ],
69                Boolean,
70            )))
71        });
72        ExprImpl::and(arms)
73    }
74}
75
76impl IntersectToSemiJoinRule {
77    pub fn create() -> BoxedRule {
78        Box::new(IntersectToSemiJoinRule {})
79    }
80}
risingwave_frontend/optimizer/rule/intersect_to_semi_join_rule.rs

risingwave_frontend/optimizer/rule/
intersect_to_semi_join_rule.rs
