risingwave_common/util/
hash_util.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::hash::{BuildHasher, Hasher};
16
17pub fn finalize_hashers<H: Hasher>(hashers: &[H]) -> Vec<u64> {
18    hashers
19        .iter()
20        .map(|hasher| hasher.finish())
21        .collect::<Vec<u64>>()
22}
23
24#[derive(Clone, Copy)]
25pub struct Crc32FastBuilder;
26
27impl BuildHasher for Crc32FastBuilder {
28    type Hasher = crc32fast::Hasher;
29
30    fn build_hasher(&self) -> Self::Hasher {
31        crc32fast::Hasher::new()
32    }
33}
34
35#[derive(Clone, Copy)]
36pub struct XxHash64Builder;
37
38impl BuildHasher for XxHash64Builder {
39    type Hasher = twox_hash::XxHash64;
40
41    fn build_hasher(&self) -> Self::Hasher {
42        twox_hash::XxHash64::with_seed(0x20210401)
43    }
44}
risingwave_common/util/hash_util.rs

risingwave_common/util/
hash_util.rs
