risingwave_frontend/optimizer/rule/batch/
batch_iceberg_count_star.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//
15// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
16// This source code is licensed under both the GPLv2 (found in the
17// COPYING file in the root directory) and Apache 2.0 License
18// (found in the LICENSE.Apache file in the root directory).
19
20use crate::PlanRef;
21use crate::optimizer::plan_node::{BatchIcebergScan, PlanAggCall};
22use crate::optimizer::rule::{BoxedRule, Rule};
23
24pub struct BatchIcebergCountStar {}
25
26impl Rule for BatchIcebergCountStar {
27    fn apply(&self, plan: PlanRef) -> Option<PlanRef> {
28        let agg = plan.as_batch_simple_agg()?;
29        if agg.core.group_key.is_empty()
30            && agg.agg_calls().len() == 1
31            && agg.agg_calls()[0].eq(&PlanAggCall::count_star())
32        {
33            let batch_iceberg = agg.core.input.as_batch_iceberg_scan()?;
34            return Some(
35                BatchIcebergScan::new_count_star_with_batch_iceberg_scan(batch_iceberg).into(),
36            );
37        }
38        None
39    }
40}
41
42impl BatchIcebergCountStar {
43    pub fn create() -> BoxedRule {
44        Box::new(BatchIcebergCountStar {})
45    }
46}