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remove unused

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This commit is contained in:
Lev Kokotov
2022-02-08 17:40:28 -08:00
parent 64b6cde2a4
commit bb1474f175
1 changed files with 0 additions and 21 deletions
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21
src/sharding.rs
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@@ -1,5 +1,3 @@
use sha1::{Digest, Sha1};
// https://github.com/postgres/postgres/blob/27b77ecf9f4d5be211900eda54d8155ada50d696/src/include/catalog/partition.h#L20 // https://github.com/postgres/postgres/blob/27b77ecf9f4d5be211900eda54d8155ada50d696/src/include/catalog/partition.h#L20
const PARTITION_HASH_SEED: u64 = 0x7A5B22367996DCFD; const PARTITION_HASH_SEED: u64 = 0x7A5B22367996DCFD;
@@ -12,17 +10,6 @@ impl Sharder {
Sharder { shards: shards } Sharder { shards: shards }
} }
/// Use SHA1 to pick a shard for the key. The key can be anything,
/// including an int or a string.
pub fn _sha1(&self, key: &[u8]) -> usize {
let mut hasher = Sha1::new();
hasher.update(key);
let result = hasher.finalize_reset();
let i = u32::from_le_bytes(result[result.len() - 4..result.len()].try_into().unwrap());
i as usize % self.shards
}
/// Hash function used by Postgres to determine which partition /// Hash function used by Postgres to determine which partition
/// to put the row in when using HASH(column) partitioning. /// to put the row in when using HASH(column) partitioning.
/// Source: https://github.com/postgres/postgres/blob/27b77ecf9f4d5be211900eda54d8155ada50d696/src/common/hashfn.c#L631 /// Source: https://github.com/postgres/postgres/blob/27b77ecf9f4d5be211900eda54d8155ada50d696/src/common/hashfn.c#L631
@@ -117,14 +104,6 @@ impl Sharder {
mod test { mod test {
use super::*; use super::*;
#[test]
fn test_sha1() {
let sharder = Sharder::new(12);
let key = b"1234";
let shard = sharder.sha1(key);
assert_eq!(shard, 1);
}
// See tests/sharding/partition_hash_test_setup.sql // See tests/sharding/partition_hash_test_setup.sql
// The output of those SELECT statements will match this test, // The output of those SELECT statements will match this test,
// confirming that we implemented Postgres BIGINT hashing correctly. // confirming that we implemented Postgres BIGINT hashing correctly.