Use the INTEGER_KEY database flag to gain (a little bit of) space

Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 [dependencies]
 bytemuck = { version = "1.14.0", features = ["derive", "extern_crate_alloc"] }
 byteorder = "1.5.0"
-heed = "0.20.0-alpha.7"
+heed = "0.20.0-alpha.8"
 ordered-float = "4.1.1"
 rand = { version = "0.8.5", features = ["alloc"] }
 thiserror = "1.0.50"

examples/compare_with_hnsw.rs

@@ -25,9 +25,11 @@ fn main() -> Result<()> {
     eprintln!("took {:.02?} to generate the {NUMBER_VECTORS} random points", before.elapsed());
 
     let mut wtxn = env.write_txn()?;
-    let mut options = env.database_options();
-    options.flags(DatabaseFlags::INTEGER_KEY);
-    let database = options.types::<KeyCodec, Unspecified>().create(&mut wtxn)?;
+    let database = env
+        .database_options()
+        .flags(DatabaseFlags::INTEGER_KEY)
+        .types::<KeyCodec, Unspecified>()
+        .create(&mut wtxn)?;
     let before = Instant::now();
     load_into_arroy(rng_arroy, wtxn, database, VECTOR_DIMENSIONS, &points)?;
     eprintln!("took {:.02?} to load into arroy", before.elapsed());

examples/debug.rs

@@ -1,6 +1,6 @@
 use arroy::{DotProduct, KeyCodec, NodeCodec, NodeMode, Reader, Result, Writer};
 use heed::types::LazyDecode;
-use heed::{Database, EnvOpenOptions, Unspecified};
+use heed::{DatabaseFlags, EnvOpenOptions, Unspecified};
 
 const TWENTY_HUNDRED_MIB: usize = 200 * 1024 * 1024;
 
@@ -11,7 +11,11 @@ fn main() -> Result<()> {
     // we will open the default unnamed database
     let mut wtxn = env.write_txn()?;
     let dimensions = 2;
-    let database: Database<KeyCodec, Unspecified> = env.create_database(&mut wtxn, None)?;
+    let database = env
+        .database_options()
+        .types::<KeyCodec, Unspecified>()
+        .flags(DatabaseFlags::INTEGER_KEY)
+        .create(&mut wtxn)?;
     let writer = Writer::<DotProduct>::prepare(&mut wtxn, database, 0, dimensions)?;
 
     for i in 0..5 {