risingwave_expr_impl/scalar/
random.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 rand::random_range;
16use risingwave_common::types::F64;
17use risingwave_expr::function;
18use uuid::Uuid;
19
20/// Generates a random float between 0 and 1 inclusive.
21#[function("random() -> float8", volatile)]
22fn random() -> F64 {
23    let val: f64 = random_range(0.0..=1.0);
24    F64::from(val)
25}
26
27/// Generates a random UUID v4 in PostgreSQL-compatible text form.
28#[function("gen_random_uuid() -> varchar", volatile)]
29fn gen_random_uuid() -> Box<str> {
30    Uuid::new_v4().to_string().into_boxed_str()
31}
32
33#[cfg(test)]
34mod tests {
35    use super::*;
36
37    #[test]
38    fn test_gen_random_uuid() {
39        let uuid = gen_random_uuid();
40        assert!(Uuid::parse_str(&uuid).is_ok());
41    }
42}
risingwave_expr_impl/scalar/random.rs

risingwave_expr_impl/scalar/
random.rs
