polars_core/hashing/
identity.rs

1use super::*;
2
3#[derive(Default)]
4pub struct IdHasher {
5    hash: u64,
6}
7
8impl Hasher for IdHasher {
9    fn finish(&self) -> u64 {
10        self.hash
11    }
12
13    fn write(&mut self, _bytes: &[u8]) {
14        unreachable!("IdHasher should only be used for integer keys <= 64 bit precision")
15    }
16
17    fn write_u32(&mut self, i: u32) {
18        self.hash = i as u64;
19    }
20
21    #[inline]
22    fn write_u64(&mut self, i: u64) {
23        self.hash = i;
24    }
25
26    fn write_i32(&mut self, i: i32) {
27        self.hash = i as u64;
28    }
29
30    fn write_i64(&mut self, i: i64) {
31        self.hash = i as u64;
32    }
33}
34
35pub type IdBuildHasher = BuildHasherDefault<IdHasher>;

polars_core/hashing/identity.rs

polars_core/hashing/
identity.rs