docker/pgcat
1
0
Fork 0
mirror of https://github.com/postgresml/pgcat.git synced 2026-03-23 01:16:30 +00:00
Code Issues Packages Projects Releases Wiki Activity

usize

Browse Source
This commit is contained in:
Lev Kokotov
2022-02-08 11:14:20 -08:00
parent 39a9dff26b
commit 5f9f2c21fc
1 changed files with 5 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
src/sharding.rs
View File

@@ -27,11 +27,11 @@ impl Sharder {
/// to put the row in when using HASH(column) partitioning.
/// Source: https://github.com/postgres/postgres/blob/27b77ecf9f4d5be211900eda54d8155ada50d696/src/common/hashfn.c#L631
/// Supports only 1 bigint at the moment, but we can add more later.
pub fn pg_bigint_hash(&self, key: i64) -> u64 {
pub fn pg_bigint_hash(&self, key: i64) -> usize {
let mut lohalf = key as u32;
let hihalf = (key >> 32) as u32;
lohalf ^= if key >= 0 { hihalf } else { !hihalf };
Self::combine(0, Self::pg_u32_hash(lohalf)) % self.shards as u64
Self::combine(0, Self::pg_u32_hash(lohalf)) as usize % self.shards as usize
}
#[inline]
@@ -125,6 +125,9 @@ mod test {
assert_eq!(shard, 1);
}
// See tests/sharding/setup.sql
// The output of those SELECT statements will match this test,
// confirming that we implemented Postgres BIGINT hashing correctly.
#[test]
fn test_pg_bigint_hash() {
let sharder = Sharder::new(5);