risingwave_expr_impl/scalar/
ascii.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_expr::function;
16
17#[function("ascii(varchar) -> int4")]
18pub fn ascii(s: &str) -> i32 {
19    s.chars().next().map(|x| x as i32).unwrap_or(0)
20}
21
22#[cfg(test)]
23mod tests {
24    use super::*;
25
26    #[test]
27    fn test_ascii() {
28        let cases = [("hello", 104), ("你好", 20320), ("", 0)];
29        for (s, expected) in cases {
30            assert_eq!(ascii(s), expected)
31        }
32    }
33}
risingwave_expr_impl/scalar/ascii.rs

risingwave_expr_impl/scalar/
ascii.rs
