risingwave_connector/sink/encoder/
bytes.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_common::catalog::Schema;
16use risingwave_common::types::DataType;
17
18use super::RowEncoder;
19
20pub struct BytesEncoder {
21    pub schema: Schema,
22    // the column must contain only one element
23    pub col_index: usize,
24}
25
26impl BytesEncoder {
27    pub fn new(schema: Schema, col_index: usize) -> Self {
28        Self { schema, col_index }
29    }
30}
31
32impl RowEncoder for BytesEncoder {
33    type Output = Vec<u8>;
34
35    fn schema(&self) -> &risingwave_common::catalog::Schema {
36        &self.schema
37    }
38
39    fn col_indices(&self) -> Option<&[usize]> {
40        Some(std::slice::from_ref(&self.col_index))
41    }
42
43    fn encode_cols(
44        &self,
45        row: impl risingwave_common::row::Row,
46        col_indices: impl Iterator<Item = usize>,
47    ) -> crate::sink::Result<Self::Output> {
48        // It is guaranteed by the caller that col_indices contains only one element
49        let mut result = Vec::new();
50        for col_index in col_indices {
51            let datum = row.datum_at(col_index);
52            let data_type = &self.schema.fields[col_index].data_type;
53            if data_type == &DataType::Bytea {
54                if let Some(scalar_impl) = datum {
55                    result = scalar_impl.into_bytea().to_vec();
56                } else {
57                    result = vec![];
58                }
59            } else {
60                return Err(crate::sink::SinkError::Encode(format!(
61                    "Unsupported data type: expected bytea, got {}",
62                    data_type
63                )));
64            }
65        }
66
67        Ok(result)
68    }
69}
70
71#[cfg(test)]
72mod test {
73    use risingwave_common::catalog::Field;
74    use risingwave_common::row::OwnedRow;
75    use risingwave_common::types::ScalarImpl;
76
77    use super::*;
78
79    #[test]
80    fn test_bytes_encoder_ser_bytes() {
81        let schema = Schema::new(vec![Field::with_name(DataType::Bytea, "col1")]);
82        let encoder = BytesEncoder::new(schema, 0);
83
84        let row = OwnedRow::new(vec![Some(ScalarImpl::Bytea(b"some_bytes".to_vec().into()))]);
85        assert_eq!(
86            encoder.encode_cols(&row, std::iter::once(0)).unwrap(),
87            b"some_bytes".to_vec()
88        );
89
90        let row = OwnedRow::new(vec![None]);
91        assert_eq!(
92            encoder.encode_cols(&row, std::iter::once(0)).unwrap(),
93            Vec::<u8>::new()
94        );
95
96        let schema = Schema::new(vec![Field::with_name(DataType::Int16, "col1")]);
97        let encoder = BytesEncoder::new(schema, 0);
98        let row = OwnedRow::new(vec![Some(ScalarImpl::Int16(123))]);
99        assert!(encoder.encode_cols(&row, std::iter::once(0)).is_err());
100    }
101}
risingwave_connector/sink/encoder/bytes.rs

risingwave_connector/sink/encoder/
bytes.rs
