risingwave_frontend/utils/
group_by.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 auto_enums::auto_enum;
16
17use crate::expr::ExprImpl;
18
19#[derive(Debug, Clone)]
20pub enum GroupBy {
21    GroupKey(Vec<ExprImpl>),
22    GroupingSets(Vec<Vec<ExprImpl>>),
23    Rollup(Vec<Vec<ExprImpl>>),
24    Cube(Vec<Vec<ExprImpl>>),
25}
26
27impl GroupBy {
28    pub fn is_empty(&self) -> bool {
29        match self {
30            GroupBy::GroupKey(group_key) => group_key.is_empty(),
31            GroupBy::GroupingSets(grouping_sets) => grouping_sets.is_empty(),
32            GroupBy::Rollup(rollup) => rollup.is_empty(),
33            GroupBy::Cube(cube) => cube.is_empty(),
34        }
35    }
36
37    #[auto_enum(Iterator)]
38    pub fn iter(&self) -> impl Iterator<Item = &ExprImpl> {
39        match self {
40            GroupBy::GroupKey(group_key) => group_key.iter(),
41            GroupBy::GroupingSets(grouping_sets) => grouping_sets.iter().flat_map(|v| v.iter()),
42            GroupBy::Rollup(rollup) => rollup.iter().flat_map(|v| v.iter()),
43            GroupBy::Cube(cube) => cube.iter().flat_map(|v| v.iter()),
44        }
45    }
46
47    #[auto_enum(Iterator)]
48    pub fn iter_mut(&mut self) -> impl Iterator<Item = &mut ExprImpl> {
49        match self {
50            GroupBy::GroupKey(group_key) => group_key.iter_mut(),
51            GroupBy::GroupingSets(grouping_sets) => {
52                grouping_sets.iter_mut().flat_map(|v| v.iter_mut())
53            }
54            GroupBy::Rollup(rollup) => rollup.iter_mut().flat_map(|v| v.iter_mut()),
55            GroupBy::Cube(cube) => cube.iter_mut().flat_map(|v| v.iter_mut()),
56        }
57    }
58}
risingwave_frontend/utils/group_by.rs

risingwave_frontend/utils/
group_by.rs
