Remove instance keys and explicit splatting everywhere (#6104)

Annihilate everything related to instance keys.

---


- [x] Remove `InstanceKey`
- [x] Remove `NumInstances`
- [x] Remove explicit/client-side splats
- [x] Remove cluster keys and autogenerated cells
- [x] Clean up every other little thing related to any of the above
- [x] Update batching docs
- [x] Check that Kiss-ICP now works smoothly
- [x] Check roundtrips
- [x] Check `rerun snippets/*.rrd`
- [x] Rebase and run checklist
- [x] Run full check bot

---

Findings (none blocking, not sure any are new -- to be investigated
later):
- Depth clouds with visible history are broken in a different way than
before
- `OutOfTreeTransform` might be broken? (see associated snippet)
- Does `DisconnectedSpace` even work? (see associated snippet)
- Is something wrong with labels when there are lots of instances?

---

- Fixes #5303
- Fixes #1014
- Fixes #1777
- Fixes #1793
- Fixes #1893
- Fixes #5685
- Fixes #1014

crates/re_data_store/benches/arrow2.rs

@@ -9,10 +9,11 @@ use arrow2::array::{Array, FixedSizeListArray, PrimitiveArray, StructArray};
 use criterion::Criterion;
 use itertools::Itertools;
 
+use re_log_types::example_components::MyIndex;
 use re_log_types::DataCell;
-use re_types::datagen::{build_some_instances, build_some_positions2d};
+use re_types::datagen::build_some_positions2d;
 use re_types::{
-    components::{InstanceKey, Position2D},
+    components::Position2D,
     testing::{build_some_large_structs, LargeStruct},
 };
 use re_types_core::{Component, SizeBytes};
@@ -40,7 +41,7 @@ const NUM_INSTANCES: usize = 1;
 
 #[derive(Debug, Clone, Copy)]
 enum ArrayKind {
-    /// E.g. an array of `InstanceKey`.
+    /// E.g. an array of `MyIndex`.
     Primitive,
 
     /// E.g. an array of `Position2D`.
@@ -79,7 +80,7 @@ fn erased_clone(c: &mut Criterion) {
 
         match kind {
             ArrayKind::Primitive => {
-                let data = build_some_instances(NUM_INSTANCES);
+                let data = MyIndex::from_iter(0..NUM_INSTANCES as _);
                 bench_arrow(&mut group, &data);
                 bench_native(&mut group, &data);
             }
@@ -198,7 +199,9 @@ fn estimated_size_bytes(c: &mut Criterion) {
         fn generate_cells(kind: ArrayKind) -> Vec<DataCell> {
             match kind {
                 ArrayKind::Primitive => (0..NUM_ROWS)
-                    .map(|_| DataCell::from_native(build_some_instances(NUM_INSTANCES).as_slice()))
+                    .map(|_| {
+                        DataCell::from_native(MyIndex::from_iter(0..NUM_INSTANCES as _).as_slice())
+                    })
                     .collect(),
                 ArrayKind::Struct => (0..NUM_ROWS)
                     .map(|_| {
@@ -312,9 +315,9 @@ fn estimated_size_bytes(c: &mut Criterion) {
                     .collect()
             }
 
-            fn generate_keys() -> Vec<Vec<InstanceKey>> {
+            fn generate_indices() -> Vec<Vec<MyIndex>> {
                 (0..NUM_ROWS)
-                    .map(|_| build_some_instances(NUM_INSTANCES))
+                    .map(|_| MyIndex::from_iter(0..NUM_INSTANCES as _))
                     .collect()
             }
 
@@ -325,7 +328,7 @@ fn estimated_size_bytes(c: &mut Criterion) {
             }
 
             match kind {
-                ArrayKind::Primitive => bench_std(&mut group, generate_keys()),
+                ArrayKind::Primitive => bench_std(&mut group, generate_indices()),
                 ArrayKind::Struct => bench_std(&mut group, generate_positions()),
                 ArrayKind::StructLarge => bench_std(&mut group, generate_rects()),
             }

crates/re_data_store/benches/data_store.rs

@@ -9,14 +9,10 @@ use re_data_store::{
     RangeQuery, TimeInt, TimeRange,
 };
 use re_log_types::{
-    build_frame_nr, DataCell, DataRow, DataTable, EntityPath, RowId, TableId, TimePoint, TimeType,
-    Timeline,
-};
-use re_types::datagen::build_some_instances;
-use re_types::{
-    components::InstanceKey,
-    testing::{build_some_large_structs, LargeStruct},
+    build_frame_nr, example_components::MyIndex, DataCell, DataRow, DataTable, EntityPath, RowId,
+    TableId, TimePoint, TimeType, Timeline,
 };
+use re_types::testing::{build_some_large_structs, LargeStruct};
 use re_types_core::{ComponentName, Loggable as _};
 
 criterion_group!(
@@ -123,7 +119,6 @@ fn insert_same_time_point(c: &mut Criterion) {
                 b.iter(|| {
                     let mut store = DataStore::new(
                         re_log_types::StoreId::random(re_log_types::StoreKind::Recording),
-                        InstanceKey::name(),
                         DataStoreConfig::default(),
                     );
 
@@ -398,9 +393,8 @@ fn build_rows_ex(
             RowId::new(),
             "large_structs",
             time_point(frame_idx),
-            num_instances as _,
             (
-                build_some_instances(num_instances),
+                MyIndex::from_iter(0..num_instances as _),
                 build_some_large_structs(num_instances),
             ),
         )
@@ -432,10 +426,8 @@ fn build_rows_ex(
 }
 
 fn insert_rows(config: DataStoreConfig, rows: &[DataRow]) -> DataStore {
-    let cluster_key = InstanceKey::name();
     let mut store = DataStore::new(
         re_log_types::StoreId::random(re_log_types::StoreKind::Recording),
-        cluster_key,
         config,
     );
     for row in rows {

crates/re_data_store/benches/gc.rs

@@ -10,8 +10,7 @@ use re_data_store::{
 use re_log_types::{
     build_frame_nr, build_log_time, DataRow, DataTable, EntityPath, RowId, TableId, Time, TimePoint,
 };
-use re_types::components::InstanceKey;
-use re_types_core::{AsComponents, ComponentBatch, ComponentName, Loggable as _};
+use re_types_core::{AsComponents, ComponentBatch};
 
 criterion_group!(benches, plotting_dashboard);
 criterion_main!(benches);
@@ -85,13 +84,7 @@ fn plotting_dashboard(c: &mut Criterion) {
 
     // Default config
     group.bench_function("default", |b| {
-        let store = build_store(
-            Default::default(),
-            InstanceKey::name(),
-            false,
-            &mut timegen,
-            &mut datagen,
-        );
+        let store = build_store(Default::default(), false, &mut timegen, &mut datagen);
         b.iter_batched(
             || store.clone(),
             |mut store| {
@@ -117,7 +110,6 @@ fn plotting_dashboard(c: &mut Criterion) {
                             indexed_bucket_num_rows: num_rows_per_bucket,
                             ..Default::default()
                         },
-                        InstanceKey::name(),
                         false,
                         &mut timegen,
                         &mut datagen,
@@ -142,7 +134,6 @@ fn plotting_dashboard(c: &mut Criterion) {
 
 fn build_store<FT, FD>(
     config: DataStoreConfig,
-    cluster_key: ComponentName,
     packed: bool,
     timegen: &mut FT,
     datagen: &mut FD,
@@ -153,7 +144,6 @@ where
 {
     let mut store = DataStore::new(
         re_log_types::StoreId::random(re_log_types::StoreKind::Recording),
-        cluster_key,
         config,
     );
 

crates/re_data_store/src/lib.rs

@@ -41,8 +41,7 @@ pub use self::store_subscriber::{StoreSubscriber, StoreSubscriberHandle};
 pub use self::store_write::{WriteError, WriteResult};
 
 pub(crate) use self::store::{
-    ClusterCellCache, IndexedBucket, IndexedBucketInner, IndexedTable, MetadataRegistry,
-    StaticCell, StaticTable,
+    IndexedBucket, IndexedBucketInner, IndexedTable, MetadataRegistry, StaticCell, StaticTable,
 };
 
 // Re-exports