feat: support remapping for IVF_FLAT, IVF_PQ and IVF_SQ

rust/lance-file/src/v2/writer.rs

@@ -21,9 +21,11 @@ use lance_encoding::encoder::{
 };
 use lance_encoding::repdef::RepDefBuilder;
 use lance_encoding::version::LanceFileVersion;
+use lance_io::object_store::ObjectStore;
 use lance_io::object_writer::ObjectWriter;
 use lance_io::traits::Writer;
 use log::debug;
+use object_store::path::Path;
 use prost::Message;
 use prost_types::Any;
 use snafu::{location, Location};
@@ -143,6 +145,24 @@ impl FileWriter {
         }
     }
 
+    /// Write a series of record batches to a new file
+    ///
+    /// Returns the number of rows written
+    pub async fn create_file_with_batches(
+        store: &ObjectStore,
+        path: &Path,
+        schema: lance_core::datatypes::Schema,
+        batches: impl Iterator<Item = RecordBatch> + Send,
+        options: FileWriterOptions,
+    ) -> Result<usize> {
+        let writer = store.create(path).await?;
+        let mut writer = Self::try_new(writer, schema, options)?;
+        for batch in batches {
+            writer.write_batch(&batch).await?;
+        }
+        Ok(writer.finish().await? as usize)
+    }
+
     async fn do_write_buffer(writer: &mut ObjectWriter, buf: &[u8]) -> Result<()> {
         writer.write_all(buf).await?;
         let pad_bytes = pad_bytes::<PAGE_BUFFER_ALIGNMENT>(buf.len());

rust/lance-index/src/lib.rs

@@ -140,7 +140,12 @@ impl IndexType {
     pub fn is_vector(&self) -> bool {
         matches!(
             self,
-            Self::Vector | Self::IvfPq | Self::IvfHnswSq | Self::IvfHnswPq
+            Self::Vector
+                | Self::IvfPq
+                | Self::IvfHnswSq
+                | Self::IvfHnswPq
+                | Self::IvfFlat
+                | Self::IvfSq
         )
     }
 }

rust/lance-index/src/vector.rs

@@ -11,9 +11,11 @@ use arrow_schema::Field;
 use async_trait::async_trait;
 use ivf::storage::IvfModel;
 use lance_core::{Result, ROW_ID_FIELD};
+use lance_io::object_store::ObjectStore;
 use lance_io::traits::Reader;
 use lance_linalg::distance::DistanceType;
 use lazy_static::lazy_static;
+use object_store::path::Path;
 use quantizer::{QuantizationType, Quantizer};
 use v3::subindex::SubIndexType;
 
@@ -182,7 +184,21 @@ pub trait VectorIndex: Send + Sync + std::fmt::Debug + Index {
     ///
     /// If an old row id is not in the mapping then it should be
     /// left alone.
-    fn remap(&mut self, mapping: &HashMap<u64, Option<u64>>) -> Result<()>;
+    async fn remap(&mut self, mapping: &HashMap<u64, Option<u64>>) -> Result<()>;
+
+    /// Remap the index according to mapping
+    ///
+    /// write the remapped index to the index_dir
+    /// this is available for only v3 index
+    async fn remap_to(
+        self: Arc<Self>,
+        _store: ObjectStore,
+        _mapping: &HashMap<u64, Option<u64>>,
+        _column: String,
+        _index_dir: Path,
+    ) -> Result<()> {
+        unimplemented!("only for v3 index")
+    }
 
     /// The metric type of this vector index.
     fn metric_type(&self) -> DistanceType;

rust/lance-index/src/vector/flat/index.rs

@@ -4,6 +4,7 @@
 //! Flat Vector Index.
 //!
 
+use std::collections::HashMap;
 use std::sync::Arc;
 
 use arrow::array::AsArray;
@@ -134,6 +135,10 @@ impl IvfSubIndex for FlatIndex {
         Ok(Self {})
     }
 
+    fn remap(&self, _: &HashMap<u64, Option<u64>>) -> Result<Self> {
+        Ok(self.clone())
+    }
+
     fn to_batch(&self) -> Result<RecordBatch> {
         Ok(RecordBatch::new_empty(Schema::empty().into()))
     }

rust/lance-index/src/vector/flat/storage.rs

@@ -1,8 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: Copyright The Lance Authors
 
-//! In-memory graph representations.
-
 use std::sync::Arc;
 
 use crate::vector::quantizer::QuantizerStorage;

rust/lance-index/src/vector/hnsw/builder.rs

@@ -749,6 +749,10 @@ impl IvfSubIndex for HNSW {
         Ok(hnsw)
     }
 
+    fn remap(&self, _mapping: &HashMap<u64, Option<u64>>) -> Result<Self> {
+        unimplemented!("HNSW remap is not supported yet");
+    }
+
     /// Encode the sub index into a record batch
     fn to_batch(&self) -> Result<RecordBatch> {
         let mut vector_id_builder = UInt32Builder::with_capacity(self.len());

rust/lance-index/src/vector/hnsw/index.rs

@@ -267,7 +267,7 @@ impl<Q: Quantization + Send + Sync + 'static> VectorIndex for HNSWIndex<Q> {
         Box::new(self.storage.as_ref().unwrap().row_ids())
     }
 
-    fn remap(&mut self, _mapping: &HashMap<u64, Option<u64>>) -> Result<()> {
+    async fn remap(&mut self, _mapping: &HashMap<u64, Option<u64>>) -> Result<()> {
         Err(Error::Index {
             message: "Remapping HNSW in this way not supported".to_string(),
             location: location!(),

rust/lance-index/src/vector/quantizer.rs

@@ -23,8 +23,16 @@ use super::flat::index::{FlatBinQuantizer, FlatQuantizer};
 use super::pq::ProductQuantizer;
 use super::{ivf::storage::IvfModel, sq::ScalarQuantizer, storage::VectorStore};
 
-pub trait Quantization: Send + Sync + Debug + DeepSizeOf + Into<Quantizer> {
-    type BuildParams: QuantizerBuildParams;
+pub trait Quantization:
+    Send
+    + Sync
+    + Clone
+    + Debug
+    + DeepSizeOf
+    + Into<Quantizer>
+    + TryFrom<Quantizer, Error = lance_core::Error>
+{
+    type BuildParams: QuantizerBuildParams + Send + Sync;
     type Metadata: QuantizerMetadata + Send + Sync;
     type Storage: QuantizerStorage<Metadata = Self::Metadata> + VectorStore + Debug;
 

rust/lance-index/src/vector/storage.rs

@@ -3,10 +3,13 @@
 
 //! Vector Storage, holding (quantized) vectors and providing distance calculation.
 
+use std::collections::HashMap;
 use std::{any::Any, sync::Arc};
 
+use arrow::array::AsArray;
 use arrow::compute::concat_batches;
-use arrow_array::{ArrayRef, RecordBatch};
+use arrow::datatypes::UInt64Type;
+use arrow_array::{ArrayRef, RecordBatch, UInt32Array, UInt64Array};
 use arrow_schema::{Field, SchemaRef};
 use deepsize::DeepSizeOf;
 use futures::prelude::stream::TryStreamExt;
@@ -70,7 +73,44 @@ pub trait VectorStore: Send + Sync + Sized + Clone {
 
     fn schema(&self) -> &SchemaRef;
 
-    fn to_batches(&self) -> Result<impl Iterator<Item = RecordBatch>>;
+    fn to_batches(&self) -> Result<impl Iterator<Item = RecordBatch> + Send>;
+
+    fn remap(&self, mapping: &HashMap<u64, Option<u64>>) -> Result<Self> {
+        let batches = self
+            .to_batches()?
+            .map(|b| {
+                let mut indices = Vec::with_capacity(b.num_rows());
+                let mut new_row_ids = Vec::with_capacity(b.num_rows());
+
+                let row_ids = b.column(0).as_primitive::<UInt64Type>().values();
+                for (i, row_id) in row_ids.iter().enumerate() {
+                    match mapping.get(row_id) {
+                        Some(Some(new_id)) => {
+                            indices.push(i as u32);
+                            new_row_ids.push(*new_id);
+                        }
+                        Some(None) => {}
+                        None => {
+                            indices.push(i as u32);
+                            new_row_ids.push(*row_id);
+                        }
+                    }
+                }
+
+                let indices = UInt32Array::from(indices);
+                let new_row_ids = Arc::new(UInt64Array::from(new_row_ids));
+                let new_vectors = arrow::compute::take(b.column(1), &indices, None)?;
+
+                Ok(RecordBatch::try_new(
+                    self.schema().clone(),
+                    vec![new_row_ids, new_vectors],
+                )?)
+            })
+            .collect::<Result<Vec<_>>>()?;
+
+        let batch = concat_batches(self.schema(), batches.iter())?;
+        Self::try_from_batch(batch, self.distance_type())
+    }
 
     fn len(&self) -> usize;
 
@@ -219,6 +259,10 @@ impl IvfQuantizationStorage {
         Q::from_metadata(&metadata, self.distance_type)
     }
 
+    pub fn schema(&self) -> SchemaRef {
+        Arc::new(self.reader.schema().as_ref().into())
+    }
+
     /// Get the number of partitions in the storage.
     pub fn num_partitions(&self) -> usize {
         self.ivf.num_partitions()

rust/lance-index/src/vector/v3/shuffler.rs

@@ -8,15 +8,18 @@ use std::sync::Arc;
 
 use arrow::{array::AsArray, compute::sort_to_indices};
 use arrow_array::{RecordBatch, UInt32Array};
+use arrow_schema::Schema;
 use future::join_all;
 use futures::prelude::*;
-use lance_arrow::RecordBatchExt;
+use itertools::Itertools;
+use lance_arrow::{RecordBatchExt, SchemaExt};
 use lance_core::{
     cache::FileMetadataCache,
     utils::tokio::{get_num_compute_intensive_cpus, spawn_cpu},
     Error, Result,
 };
 use lance_encoding::decoder::{DecoderPlugins, FilterExpression};
+use lance_file::v2::reader::ReaderProjection;
 use lance_file::v2::{
     reader::{FileReader, FileReaderOptions},
     writer::FileWriter,
@@ -256,14 +259,35 @@ impl ShuffleReader for IvfShufflerReader {
             FileReaderOptions::default(),
         )
         .await?;
-        let schema = reader.schema().as_ref().into();
-
+        let schema: Schema = reader.schema().as_ref().into();
+        let projection = schema
+            .fields()
+            .iter()
+            .enumerate()
+            .filter_map(|(index, f)| {
+                if f.name() != PART_ID_COLUMN {
+                    Some(index)
+                } else {
+                    None
+                }
+            })
+            .collect::<Vec<_>>();
+        let schema = schema.project(&projection)?;
+        let projection = ReaderProjection::from_column_names(
+            reader.schema().as_ref(),
+            &schema
+                .field_names()
+                .into_iter()
+                .map(|s| s.as_ref())
+                .collect_vec(),
+        )?;
         Ok(Some(Box::new(RecordBatchStreamAdapter::new(
             Arc::new(schema),
-            reader.read_stream(
+            reader.read_stream_projected(
                 lance_io::ReadBatchParams::RangeFull,
                 4096,
                 16,
+                projection,
                 FilterExpression::no_filter(),
             )?,
         ))))

rust/lance-index/src/vector/v3/subindex.rs

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: Copyright The Lance Authors
 
+use std::collections::HashMap;
 use std::fmt::Debug;
 use std::sync::Arc;
 
@@ -15,7 +16,7 @@ use crate::{prefilter::PreFilter, vector::Query};
 /// A sub index for IVF index
 pub trait IvfSubIndex: Send + Sync + Debug + DeepSizeOf {
     type QueryParams: Send + Sync + for<'a> From<&'a Query>;
-    type BuildParams: Clone;
+    type BuildParams: Clone + Send + Sync;
 
     /// Load the sub index from a record batch with a single row
     fn load(data: RecordBatch) -> Result<Self>
@@ -49,6 +50,10 @@ pub trait IvfSubIndex: Send + Sync + Debug + DeepSizeOf {
     where
         Self: Sized;
 
+    fn remap(&self, mapping: &HashMap<u64, Option<u64>>) -> Result<Self>
+    where
+        Self: Sized;
+
     /// Encode the sub index into a record batch
     fn to_batch(&self) -> Result<RecordBatch>;
 }

rust/lance-linalg/src/distance.rs

@@ -23,6 +23,7 @@ pub mod norm_l2;
 pub use cosine::*;
 use deepsize::DeepSizeOf;
 pub use dot::*;
+use hamming::hamming_distance_arrow_batch;
 pub use l2::*;
 pub use norm_l2::*;
 
@@ -55,7 +56,7 @@ impl DistanceType {
             Self::L2 => l2_distance_arrow_batch,
             Self::Cosine => cosine_distance_arrow_batch,
             Self::Dot => dot_distance_arrow_batch,
-            Self::Hamming => todo!(),
+            Self::Hamming => hamming_distance_arrow_batch,
         }
     }
 

rust/lance-linalg/src/distance/hamming.rs

@@ -8,7 +8,7 @@ use std::sync::Arc;
 use crate::{Error, Result};
 use arrow_array::cast::AsArray;
 use arrow_array::types::UInt8Type;
-use arrow_array::{Array, Float32Array};
+use arrow_array::{Array, FixedSizeListArray, Float32Array};
 use arrow_schema::DataType;
 
 pub trait Hamming {
@@ -62,11 +62,14 @@ pub fn hamming_distance_batch<'a>(
     Box::new(to.chunks_exact(dimension).map(|v| hamming(from, v)))
 }
 
-pub fn hamming_distance_arrow_batch(from: &dyn Array, to: &dyn Array) -> Result<Arc<Float32Array>> {
+pub fn hamming_distance_arrow_batch(
+    from: &dyn Array,
+    to: &FixedSizeListArray,
+) -> Result<Arc<Float32Array>> {
     let dists = match *from.data_type() {
         DataType::UInt8 => hamming_distance_batch(
             from.as_primitive::<UInt8Type>().values(),
-            to.as_primitive::<UInt8Type>().values(),
+            to.values().as_primitive::<UInt8Type>().values(),
             from.len(),
         ),
         _ => {

rust/lance/src/dataset/scanner.rs

@@ -1689,6 +1689,15 @@ impl Scanner {
         // Check if we've created new versions since the index was built.
         let unindexed_fragments = self.dataset.unindexed_fragments(&index.name).await?;
         if !unindexed_fragments.is_empty() {
+            // need to set the metric type to be the same as the index
+            // to make sure the distance is comparable.
+            let idx = self
+                .dataset
+                .open_vector_index(q.column.as_str(), &index.uuid.to_string())
+                .await?;
+            let mut q = q.clone();
+            q.metric_type = idx.metric_type();
+
             // If the vector column is not present, we need to take the vector column, so
             // that the distance value is comparable with the flat search ones.
             if knn_node.schema().column_with_name(&q.column).is_none() {
@@ -1725,7 +1734,7 @@ impl Scanner {
                 scan_node = Arc::new(FilterExec::try_new(physical_refine_expr, scan_node)?);
             }
             // first we do flat search on just the new data
-            let topk_appended = self.flat_knn(scan_node, q)?;
+            let topk_appended = self.flat_knn(scan_node, &q)?;
 
             // To do a union, we need to make the schemas match. Right now
             // knn_node: _distance, _rowid, vector
@@ -1740,7 +1749,7 @@ impl Scanner {
                 datafusion::physical_plan::Partitioning::RoundRobinBatch(1),
             )?;
             // then we do a flat search on KNN(new data) + ANN(indexed data)
-            return self.flat_knn(Arc::new(unioned), q);
+            return self.flat_knn(Arc::new(unioned), &q);
         }
 
         Ok(knn_node)