risingwave_frontend/optimizer/rule/
iceberg_count_star_rule.rs

1// Copyright 2026 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::batch_plan::iceberg_scan_node::IcebergScanType;
16
17use super::prelude::*;
18use crate::expr::ExprImpl;
19use crate::optimizer::plan_node::generic::GenericPlanRef;
20use crate::optimizer::plan_node::{LogicalValues, PlanAggCall, PlanTreeNodeUnary};
21
22pub struct IcebergCountStarRule;
23
24impl Rule<Logical> for IcebergCountStarRule {
25    fn apply(&self, plan: PlanRef) -> Option<PlanRef> {
26        let agg = plan.as_logical_agg()?;
27        let core = agg.core();
28        if core.group_key.is_empty()
29            && core.grouping_sets.is_empty()
30            && core.agg_calls.len() == 1
31            && core.agg_calls[0] == PlanAggCall::count_star()
32        {
33            let input = agg.input();
34            let iceberg_scan = input.as_logical_iceberg_scan()?;
35            if iceberg_scan.iceberg_scan_type() != IcebergScanType::DataScan {
36                return None;
37            }
38            if iceberg_scan.task.predicate().is_some() {
39                return None;
40            }
41            let count: i64 = iceberg_scan
42                .task
43                .tasks()
44                .iter()
45                .map(|task| task.record_count)
46                .sum::<Option<u64>>()?
47                .try_into()
48                .ok()?;
49            return Some(
50                LogicalValues::new(
51                    vec![vec![ExprImpl::literal_bigint(count)]],
52                    agg.schema().clone(),
53                    agg.ctx(),
54                )
55                .into(),
56            );
57        }
58        None
59    }
60}
61
62impl IcebergCountStarRule {
63    pub fn create() -> BoxedRule {
64        Box::new(Self)
65    }
66}
risingwave_frontend/optimizer/rule/iceberg_count_star_rule.rs

risingwave_frontend/optimizer/rule/
iceberg_count_star_rule.rs
