risingwave_expr_impl/scalar/
concat_op.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 std::fmt::Write;
16
17use risingwave_expr::function;
18
19#[function("concat_op(varchar, varchar) -> varchar")]
20pub fn concat_op(left: &str, right: &str, writer: &mut impl Write) {
21    writer.write_str(left).unwrap();
22    writer.write_str(right).unwrap();
23}
24
25#[cfg(test)]
26mod tests {
27    use super::*;
28
29    #[test]
30    fn test_concat_op() {
31        let mut s = String::new();
32        concat_op("114", "514", &mut s);
33        assert_eq!(s, "114514")
34    }
35}
risingwave_expr_impl/scalar/concat_op.rs

risingwave_expr_impl/scalar/
concat_op.rs
