refactor: refine delete RPC (#351)

Signed-off-by: usamoi <usamoi@outlook.com>

crates/service/src/index/mod.rs

@@ -448,6 +448,25 @@ impl<S: G> IndexView<S> {
             }
         }))
     }
+    pub fn list(&self) -> impl Iterator<Item = Pointer> + '_ {
+        let sealed = self
+            .sealed
+            .values()
+            .flat_map(|x| (0..x.len()).map(|i| x.payload(i)));
+        let growing = self
+            .growing
+            .values()
+            .flat_map(|x| (0..x.len()).map(|i| x.payload(i)));
+        let write = self
+            .write
+            .iter()
+            .map(|(_, x)| x)
+            .flat_map(|x| (0..x.len()).map(|i| x.payload(i)));
+        sealed
+            .chain(growing)
+            .chain(write)
+            .filter_map(|p| self.delete.check(p))
+    }
     pub fn insert(
         &self,
         vector: Vec<S::Scalar>,
@@ -467,37 +486,8 @@ impl<S: G> IndexView<S> {
             Ok(Err(OutdatedError))
         }
     }
-    pub fn delete<F: FnMut(Pointer) -> bool>(&self, mut f: F) {
-        for (_, sealed) in self.sealed.iter() {
-            let n = sealed.len();
-            for i in 0..n {
-                if let Some(p) = self.delete.check(sealed.payload(i)) {
-                    if f(p) {
-                        self.delete.delete(p);
-                    }
-                }
-            }
-        }
-        for (_, growing) in self.growing.iter() {
-            let n = growing.len();
-            for i in 0..n {
-                if let Some(p) = self.delete.check(growing.payload(i)) {
-                    if f(p) {
-                        self.delete.delete(p);
-                    }
-                }
-            }
-        }
-        if let Some((_, write)) = &self.write {
-            let n = write.len();
-            for i in 0..n {
-                if let Some(p) = self.delete.check(write.payload(i)) {
-                    if f(p) {
-                        self.delete.delete(p);
-                    }
-                }
-            }
-        }
+    pub fn delete(&self, p: Pointer) {
+        self.delete.delete(p);
     }
     pub fn flush(&self) {
         self.delete.flush();

crates/service/src/instance/mod.rs

@@ -173,6 +173,16 @@ impl InstanceView {
             _ => Err(ServiceError::Unmatched),
         }
     }
+    pub fn list(&self) -> impl Iterator<Item = Pointer> + '_ {
+        match self {
+            InstanceView::F32Cos(x) => Box::new(x.list()) as Box<dyn Iterator<Item = Pointer>>,
+            InstanceView::F32Dot(x) => Box::new(x.list()),
+            InstanceView::F32L2(x) => Box::new(x.list()),
+            InstanceView::F16Cos(x) => Box::new(x.list()),
+            InstanceView::F16Dot(x) => Box::new(x.list()),
+            InstanceView::F16L2(x) => Box::new(x.list()),
+        }
+    }
     pub fn insert(
         &self,
         vector: DynamicVector,
@@ -188,14 +198,14 @@ impl InstanceView {
             _ => Err(ServiceError::Unmatched),
         }
     }
-    pub fn delete<F: FnMut(Pointer) -> bool>(&self, f: F) {
+    pub fn delete(&self, pointer: Pointer) {
         match self {
-            InstanceView::F32Cos(x) => x.delete(f),
-            InstanceView::F32Dot(x) => x.delete(f),
-            InstanceView::F32L2(x) => x.delete(f),
-            InstanceView::F16Cos(x) => x.delete(f),
-            InstanceView::F16Dot(x) => x.delete(f),
-            InstanceView::F16L2(x) => x.delete(f),
+            InstanceView::F32Cos(x) => x.delete(pointer),
+            InstanceView::F32Dot(x) => x.delete(pointer),
+            InstanceView::F32L2(x) => x.delete(pointer),
+            InstanceView::F16Cos(x) => x.delete(pointer),
+            InstanceView::F16Dot(x) => x.delete(pointer),
+            InstanceView::F16L2(x) => x.delete(pointer),
         }
     }
     pub fn flush(&self) {

src/bgworker/normal.rs

@@ -65,28 +65,17 @@ fn session(worker: Arc<Worker>, handler: RpcHandler) -> Result<!, ConnectionErro
     loop {
         match handler.handle()? {
             // transaction
-            RpcHandle::Commit {
-                pending_deletes,
-                pending_dirty,
-                x,
-            } => {
+            RpcHandle::Flush { handle, x } => {
                 let view = worker.view();
-                for handle in pending_deletes {
-                    worker.instance_destroy(handle);
-                }
-                for handle in pending_dirty {
-                    if let Some(instance) = view.get(handle) {
-                        if let Some(view) = instance.view() {
-                            view.flush();
-                        }
+                if let Some(instance) = view.get(handle) {
+                    if let Some(view) = instance.view() {
+                        view.flush();
                     }
                 }
                 handler = x.leave()?;
             }
-            RpcHandle::Abort { pending_deletes, x } => {
-                for handle in pending_deletes {
-                    worker.instance_destroy(handle);
-                }
+            RpcHandle::Drop { handle, x } => {
+                worker.instance_destroy(handle);
                 handler = x.leave()?;
             }
             RpcHandle::Create { handle, options, x } => {
@@ -120,7 +109,7 @@ fn session(worker: Arc<Worker>, handler: RpcHandler) -> Result<!, ConnectionErro
                 }
                 handler = x.leave()?;
             }
-            RpcHandle::Delete { handle, mut x } => {
+            RpcHandle::Delete { handle, pointer, x } => {
                 let view = worker.view();
                 let Some(instance) = view.get(handle) else {
                     x.reset(ServiceError::UnknownIndex)?;
@@ -129,7 +118,7 @@ fn session(worker: Arc<Worker>, handler: RpcHandler) -> Result<!, ConnectionErro
                     Some(x) => x,
                     None => x.reset(ServiceError::Upgrade2)?,
                 };
-                instance_view.delete(|p| x.next(p).expect("Panic in VACUUM."));
+                instance_view.delete(pointer);
                 handler = x.leave()?;
             }
             RpcHandle::Stat { handle, x } => {
@@ -204,6 +193,30 @@ fn session(worker: Arc<Worker>, handler: RpcHandler) -> Result<!, ConnectionErro
                     }
                 }
             }
+            RpcHandle::List { handle, x } => {
+                use crate::ipc::server::ListHandle::*;
+                let view = worker.view();
+                let Some(instance) = view.get(handle) else {
+                    x.reset(ServiceError::UnknownIndex)?;
+                };
+                let view = match instance.view() {
+                    Some(x) => x,
+                    None => x.reset(ServiceError::Upgrade2)?,
+                };
+                let mut it = view.list();
+                let mut x = x.error()?;
+                loop {
+                    match x.handle()? {
+                        Next { x: y } => {
+                            x = y.leave(it.next())?;
+                        }
+                        Leave { x } => {
+                            handler = x;
+                            break;
+                        }
+                    }
+                }
+            }
             // admin
             RpcHandle::Upgrade { x } => {
                 handler = x.leave()?;

src/bgworker/upgrade.rs

@@ -57,18 +57,18 @@ fn session(handler: RpcHandler) -> Result<(), ConnectionError> {
     let mut handler = handler;
     loop {
         match handler.handle()? {
-            RpcHandle::Commit { x, .. } => {
-                handler = x.leave()?;
-            }
-            RpcHandle::Abort { x, .. } => {
+            RpcHandle::Drop { x, .. } => {
+                // false drop
                 handler = x.leave()?;
             }
+            RpcHandle::Flush { x, .. } => x.reset(ServiceError::Upgrade)?,
             RpcHandle::Create { x, .. } => x.reset(ServiceError::Upgrade)?,
             RpcHandle::Insert { x, .. } => x.reset(ServiceError::Upgrade)?,
             RpcHandle::Delete { x, .. } => x.reset(ServiceError::Upgrade)?,
             RpcHandle::Stat { x, .. } => x.reset(ServiceError::Upgrade)?,
             RpcHandle::Basic { x, .. } => x.reset(ServiceError::Upgrade)?,
             RpcHandle::Vbase { x, .. } => x.reset(ServiceError::Upgrade)?,
+            RpcHandle::List { x, .. } => x.reset(ServiceError::Upgrade)?,
             RpcHandle::Upgrade { x } => {
                 let _ = std::fs::remove_dir_all("./pg_vectors");
                 handler = x.leave()?;

src/index/am_update.rs

@@ -10,24 +10,15 @@ pub fn update_insert(handle: Handle, vector: DynamicVector, tid: pgrx::pg_sys::I
     rpc.insert(handle, vector, pointer);
 }
 
-pub fn update_delete(handle: Handle, hook: impl Fn(Pointer) -> bool) {
+pub fn update_delete(handle: Handle, f: impl Fn(Pointer) -> bool) {
     callback_dirty(handle);
 
-    struct Delete<H> {
-        hook: H,
-    }
-
-    impl<H> crate::ipc::client::Delete for Delete<H>
-    where
-        H: Fn(Pointer) -> bool,
-    {
-        fn test(&mut self, p: Pointer) -> bool {
-            (self.hook)(p)
+    let mut rpc_list = crate::ipc::client::borrow_mut().list(handle);
+    let mut rpc = crate::ipc::client::borrow_mut();
+    while let Some(p) = rpc_list.next() {
+        if f(p) {
+            rpc.delete(handle, p);
         }
     }
-
-    let client_delete = Delete { hook };
-
-    let mut rpc = crate::ipc::client::borrow_mut();
-    rpc.delete(handle, client_delete);
+    rpc_list.leave();
 }

src/index/hook_transaction.rs

@@ -1,31 +1,40 @@
 use crate::prelude::*;
 use crate::utils::cells::PgRefCell;
 use service::prelude::*;
+use std::collections::BTreeSet;
 use std::ops::DerefMut;
 
-static DIRTY: PgRefCell<Vec<Handle>> = unsafe { PgRefCell::new(Vec::new()) };
+static DIRTY: PgRefCell<BTreeSet<Handle>> = unsafe { PgRefCell::new(BTreeSet::new()) };
 
 pub fn callback_dirty(handle: Handle) {
-    DIRTY.borrow_mut().push(handle);
+    DIRTY.borrow_mut().insert(handle);
 }
 
 pub fn commit() {
-    let pending_deletes = pending_deletes(true);
     let pending_dirty = std::mem::take(DIRTY.borrow_mut().deref_mut());
+    let pending_deletes = pending_deletes(true);
     if pending_deletes.is_empty() && pending_dirty.is_empty() {
         return;
     }
     let mut rpc = crate::ipc::client::borrow_mut();
-    rpc.commit(pending_deletes, pending_dirty);
+    for handle in pending_dirty {
+        rpc.flush(handle);
+    }
+    for handle in pending_deletes {
+        rpc.drop(handle);
+    }
 }
 
 pub fn abort() {
+    let _pending_dirty = std::mem::take(DIRTY.borrow_mut().deref_mut());
     let pending_deletes = pending_deletes(false);
     if pending_deletes.is_empty() {
         return;
     }
     let mut rpc = crate::ipc::client::borrow_mut();
-    rpc.abort(pending_deletes);
+    for handle in pending_deletes {
+        rpc.drop(handle);
+    }
 }
 
 #[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]

src/ipc/client/mod.rs

@@ -53,18 +53,15 @@ impl Rpc {
 }
 
 impl ClientGuard<Rpc> {
-    pub fn commit(&mut self, pending_deletes: Vec<Handle>, pending_dirty: Vec<Handle>) {
-        let packet = RpcPacket::Commit {
-            pending_deletes,
-            pending_dirty,
-        };
+    pub fn flush(&mut self, handle: Handle) {
+        let packet = RpcPacket::Flush { handle };
         self.socket.ok(packet).friendly();
-        let commit::CommitPacket::Leave {} = self.socket.recv().friendly();
+        let flush::FlushPacket::Leave {} = self.socket.recv().friendly();
     }
-    pub fn abort(&mut self, pending_deletes: Vec<Handle>) {
-        let packet = RpcPacket::Abort { pending_deletes };
+    pub fn drop(&mut self, handle: Handle) {
+        let packet = RpcPacket::Drop { handle };
         self.socket.ok(packet).friendly();
-        let abort::AbortPacket::Leave {} = self.socket.recv().friendly();
+        let drop::DropPacket::Leave {} = self.socket.recv().friendly();
     }
     pub fn create(&mut self, handle: Handle, options: IndexOptions) {
         let packet = RpcPacket::Create { handle, options };
@@ -83,24 +80,13 @@ impl ClientGuard<Rpc> {
             opts,
         };
         self.socket.ok(packet).friendly();
-        let vbase::VbaseErrorPacket {} = self.socket.recv().friendly();
+        let basic::BasicErrorPacket {} = self.socket.recv().friendly();
         ClientGuard::map(self)
     }
-    pub fn delete(&mut self, handle: Handle, mut t: impl Delete) {
-        let packet = RpcPacket::Delete { handle };
+    pub fn delete(&mut self, handle: Handle, pointer: Pointer) {
+        let packet = RpcPacket::Delete { handle, pointer };
         self.socket.ok(packet).friendly();
-        loop {
-            match self.socket.recv().friendly() {
-                delete::DeletePacket::Test { p } => {
-                    self.socket
-                        .ok(delete::DeleteTestPacket { delete: t.test(p) })
-                        .friendly();
-                }
-                delete::DeletePacket::Leave {} => {
-                    return;
-                }
-            }
-        }
+        let delete::DeletePacket::Leave {} = self.socket.recv().friendly();
     }
     pub fn insert(&mut self, handle: Handle, vector: DynamicVector, pointer: Pointer) {
         let packet = RpcPacket::Insert {
@@ -132,6 +118,12 @@ impl ClientGuard<Rpc> {
         let vbase::VbaseErrorPacket {} = self.socket.recv().friendly();
         ClientGuard::map(self)
     }
+    pub fn list(mut self, handle: Handle) -> ClientGuard<List> {
+        let packet = RpcPacket::List { handle };
+        self.socket.ok(packet).friendly();
+        let list::ListErrorPacket {} = self.socket.recv().friendly();
+        ClientGuard::map(self)
+    }
     pub fn upgrade(&mut self) {
         let packet = RpcPacket::Upgrade {};
         self.socket.ok(packet).friendly();
@@ -149,10 +141,6 @@ impl ClientLike for Rpc {
     }
 }
 
-pub trait Delete {
-    fn test(&mut self, p: Pointer) -> bool;
-}
-
 pub struct Vbase {
     socket: ClientSocket,
 }
@@ -217,6 +205,38 @@ impl ClientLike for Basic {
     }
 }
 
+pub struct List {
+    socket: ClientSocket,
+}
+
+impl List {
+    pub fn next(&mut self) -> Option<Pointer> {
+        let packet = list::ListPacket::Next {};
+        self.socket.ok(packet).friendly();
+        let list::ListNextPacket { p } = self.socket.recv().friendly();
+        p
+    }
+}
+
+impl ClientGuard<List> {
+    pub fn leave(mut self) -> ClientGuard<Rpc> {
+        let packet = list::ListPacket::Leave {};
+        self.socket.ok(packet).friendly();
+        let list::ListLeavePacket {} = self.socket.recv().friendly();
+        ClientGuard::map(self)
+    }
+}
+
+impl ClientLike for List {
+    fn from_socket(socket: ClientSocket) -> Self {
+        Self { socket }
+    }
+
+    fn to_socket(self) -> ClientSocket {
+        self.socket
+    }
+}
+
 static CLIENTS: PgRefCell<Vec<ClientSocket>> = unsafe { PgRefCell::new(Vec::new()) };
 
 pub fn borrow_mut() -> ClientGuard<Rpc> {

src/ipc/packet/delete.rs

@@ -1,13 +1,6 @@
 use serde::{Deserialize, Serialize};
-use service::prelude::*;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub enum DeletePacket {
-    Test { p: Pointer },
     Leave {},
 }
-
-#[derive(Debug, Serialize, Deserialize)]
-pub struct DeleteTestPacket {
-    pub delete: bool,
-}

src/ipc/packet/drop.rs

@@ -1,6 +1,6 @@
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Serialize, Deserialize)]
-pub enum AbortPacket {
+pub enum DropPacket {
     Leave {},
 }

src/ipc/packet/flush.rs

@@ -1,6 +1,6 @@
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Serialize, Deserialize)]
-pub enum CommitPacket {
+pub enum FlushPacket {
     Leave {},
 }

src/ipc/packet/list.rs

@@ -0,0 +1,19 @@
+use serde::{Deserialize, Serialize};
+use service::prelude::*;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ListErrorPacket {}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum ListPacket {
+    Next {},
+    Leave {},
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ListNextPacket {
+    pub p: Option<Pointer>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ListLeavePacket {}

src/ipc/packet/mod.rs

@@ -1,9 +1,10 @@
-pub mod abort;
 pub mod basic;
-pub mod commit;
 pub mod create;
 pub mod delete;
+pub mod drop;
+pub mod flush;
 pub mod insert;
+pub mod list;
 pub mod stat;
 pub mod upgrade;
 pub mod vbase;
@@ -16,12 +17,11 @@ use service::prelude::*;
 #[derive(Debug, Serialize, Deserialize)]
 pub enum RpcPacket {
     // transaction
-    Commit {
-        pending_deletes: Vec<Handle>,
-        pending_dirty: Vec<Handle>,
+    Flush {
+        handle: Handle,
     },
-    Abort {
-        pending_deletes: Vec<Handle>,
+    Drop {
+        handle: Handle,
     },
     Create {
         handle: Handle,
@@ -35,6 +35,7 @@ pub enum RpcPacket {
     },
     Delete {
         handle: Handle,
+        pointer: Pointer,
     },
     Stat {
         handle: Handle,
@@ -49,6 +50,9 @@ pub enum RpcPacket {
         vector: DynamicVector,
         opts: SearchOptions,
     },
+    List {
+        handle: Handle,
+    },
     // admin
     Upgrade {},
 }

src/ipc/server/mod.rs

@@ -16,19 +16,15 @@ impl RpcHandler {
     }
     pub fn handle(mut self) -> Result<RpcHandle, ConnectionError> {
         Ok(match self.socket.recv::<RpcPacket>()? {
-            RpcPacket::Commit {
-                pending_deletes,
-                pending_dirty,
-            } => RpcHandle::Commit {
-                pending_deletes,
-                pending_dirty,
-                x: Commit {
+            RpcPacket::Flush { handle } => RpcHandle::Flush {
+                handle,
+                x: Flush {
                     socket: self.socket,
                 },
             },
-            RpcPacket::Abort { pending_deletes } => RpcHandle::Abort {
-                pending_deletes,
-                x: Abort {
+            RpcPacket::Drop { handle } => RpcHandle::Drop {
+                handle,
+                x: Drop {
                     socket: self.socket,
                 },
             },
@@ -51,8 +47,9 @@ impl RpcHandler {
                     socket: self.socket,
                 },
             },
-            RpcPacket::Delete { handle } => RpcHandle::Delete {
+            RpcPacket::Delete { handle, pointer } => RpcHandle::Delete {
                 handle,
+                pointer,
                 x: Delete {
                     socket: self.socket,
                 },
@@ -87,6 +84,12 @@ impl RpcHandler {
                     socket: self.socket,
                 },
             },
+            RpcPacket::List { handle } => RpcHandle::List {
+                handle,
+                x: List {
+                    socket: self.socket,
+                },
+            },
             RpcPacket::Upgrade {} => RpcHandle::Upgrade {
                 x: Upgrade {
                     socket: self.socket,
@@ -97,14 +100,13 @@ impl RpcHandler {
 }
 
 pub enum RpcHandle {
-    Commit {
-        pending_deletes: Vec<Handle>,
-        pending_dirty: Vec<Handle>,
-        x: Commit,
+    Flush {
+        handle: Handle,
+        x: Flush,
     },
-    Abort {
-        pending_deletes: Vec<Handle>,
-        x: Abort,
+    Drop {
+        handle: Handle,
+        x: Drop,
     },
     Create {
         handle: Handle,
@@ -125,6 +127,7 @@ pub enum RpcHandle {
     },
     Delete {
         handle: Handle,
+        pointer: Pointer,
         x: Delete,
     },
     Stat {
@@ -137,18 +140,22 @@ pub enum RpcHandle {
         opts: SearchOptions,
         x: Vbase,
     },
+    List {
+        handle: Handle,
+        x: List,
+    },
     Upgrade {
         x: Upgrade,
     },
 }
 
-pub struct Commit {
+pub struct Flush {
     socket: ServerSocket,
 }
 
-impl Commit {
+impl Flush {
     pub fn leave(mut self) -> Result<RpcHandler, ConnectionError> {
-        let packet = commit::CommitPacket::Leave {};
+        let packet = flush::FlushPacket::Leave {};
         self.socket.ok(packet)?;
         Ok(RpcHandler {
             socket: self.socket,
@@ -160,13 +167,13 @@ impl Commit {
     }
 }
 
-pub struct Abort {
+pub struct Drop {
     socket: ServerSocket,
 }
 
-impl Abort {
+impl Drop {
     pub fn leave(mut self) -> Result<RpcHandler, ConnectionError> {
-        let packet = abort::AbortPacket::Leave {};
+        let packet = drop::DropPacket::Leave {};
         self.socket.ok(packet)?;
         Ok(RpcHandler {
             socket: self.socket,
@@ -217,12 +224,6 @@ pub struct Delete {
 }
 
 impl Delete {
-    pub fn next(&mut self, p: Pointer) -> Result<bool, ConnectionError> {
-        let packet = delete::DeletePacket::Test { p };
-        self.socket.ok(packet)?;
-        let delete::DeleteTestPacket { delete } = self.socket.recv::<delete::DeleteTestPacket>()?;
-        Ok(delete)
-    }
     pub fn leave(mut self) -> Result<RpcHandler, ConnectionError> {
         let packet = delete::DeletePacket::Leave {};
         self.socket.ok(packet)?;
@@ -370,6 +371,65 @@ impl VbaseNext {
     }
 }
 
+pub struct List {
+    socket: ServerSocket,
+}
+
+impl List {
+    pub fn error(mut self) -> Result<ListHandler, ConnectionError> {
+        self.socket.ok(list::ListErrorPacket {})?;
+        Ok(ListHandler {
+            socket: self.socket,
+        })
+    }
+    pub fn reset(mut self, err: ServiceError) -> Result<!, ConnectionError> {
+        self.socket.err(err)
+    }
+}
+
+pub struct ListHandler {
+    socket: ServerSocket,
+}
+
+impl ListHandler {
+    pub fn handle(mut self) -> Result<ListHandle, ConnectionError> {
+        Ok(match self.socket.recv::<list::ListPacket>()? {
+            list::ListPacket::Next {} => ListHandle::Next {
+                x: ListNext {
+                    socket: self.socket,
+                },
+            },
+            list::ListPacket::Leave {} => {
+                self.socket.ok(list::ListLeavePacket {})?;
+                ListHandle::Leave {
+                    x: RpcHandler {
+                        socket: self.socket,
+                    },
+                }
+            }
+        })
+    }
+}
+
+pub enum ListHandle {
+    Next { x: ListNext },
+    Leave { x: RpcHandler },
+}
+
+pub struct ListNext {
+    socket: ServerSocket,
+}
+
+impl ListNext {
+    pub fn leave(mut self, p: Option<Pointer>) -> Result<ListHandler, ConnectionError> {
+        let packet = list::ListNextPacket { p };
+        self.socket.ok(packet)?;
+        Ok(ListHandler {
+            socket: self.socket,
+        })
+    }
+}
+
 pub struct Upgrade {
     socket: ServerSocket,
 }

tests/sqllogictest/index_vacuum.slt

@@ -0,0 +1,25 @@
+statement ok
+SET search_path TO pg_temp, vectors;
+
+statement ok
+CREATE TABLE t (id bigserial, val vector(3));
+
+statement ok
+INSERT INTO t (val) SELECT ARRAY[random(), random(), random()]::real[] FROM generate_series(1, 1000);
+
+statement ok
+CREATE INDEX ON t USING vectors (val vector_l2_ops);
+
+statement ok
+DELETE FROM t WHERE id % 2 = 0;
+
+statement ok
+VACUUM FULL;
+
+query I
+SELECT COUNT(1) FROM (SELECT 1 FROM t ORDER BY val <-> '[0,0,0]' limit 10) t2;
+----
+10
+
+statement ok
+DROP TABLE t;