record_pairs: Use rustc-hash

Author: zaeleus

Diff for: Cargo.lock

@@ -22,6 +22,7 @@ indexmap = "2.7.1"
 mimalloc = "0.1.43"
 noodles = { version = "0.95.0", features = ["bam", "bgzf", "core", "gff", "sam"] }
 noodles-bgzf = { version = "0.37.0", features = ["libdeflate"] }
+rustc-hash = "2.1.1"
 thiserror = "2.0.11"
 tracing = "0.1.25"
 tracing-subscriber = "0.3.3"

Diff for: Cargo.toml

@@ -2,19 +2,17 @@ pub mod segment_position;
 
 pub use self::segment_position::SegmentPosition;
 
-use std::{
-    collections::HashMap,
-    io::{self, Read},
-};
+use std::io::{self, Read};
 
 use noodles::bam;
+use rustc_hash::FxHashMap;
 
 pub struct RecordPairs<R>
 where
     R: Read,
 {
     reader: bam::io::Reader<R>,
-    cache: HashMap<Vec<u8>, Vec<bam::Record>>,
+    cache: FxHashMap<Vec<u8>, Vec<bam::Record>>,
     primary_only: bool,
 }
 
@@ -25,7 +23,7 @@ where
     pub fn new(reader: bam::io::Reader<R>, primary_only: bool) -> Self {
         Self {
             reader,
-            cache: HashMap::new(),
+            cache: FxHashMap::default(),
             primary_only,
         }
     }