mirror of
https://github.com/meilisearch/MeiliSearch
synced 2024-09-22 16:41:45 +02:00
342 lines
13 KiB
Rust
342 lines
13 KiB
Rust
use std::borrow::Cow;
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use std::convert::TryInto;
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use std::fs::File;
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use std::io;
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use grenad::MergerBuilder;
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use heed::types::ByteSlice;
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use heed::{BytesDecode, RwTxn};
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use roaring::RoaringBitmap;
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use super::helpers::{
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self, merge_nothing, roaring_bitmap_from_u32s_array, serialize_roaring_bitmap, valid_lmdb_key,
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CursorClonableMmap,
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};
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use super::{ClonableMmap, MergeFn};
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use crate::heed_codec::facet::{decode_prefix_string, encode_prefix_string};
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use crate::update::index_documents::helpers::as_cloneable_grenad;
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use crate::{
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lat_lng_to_xyz, BoRoaringBitmapCodec, CboRoaringBitmapCodec, DocumentId, GeoPoint, Index,
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Result,
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};
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pub(crate) enum TypedChunk {
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DocidWordPositions(grenad::Reader<CursorClonableMmap>),
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FieldIdDocidFacetStrings(grenad::Reader<CursorClonableMmap>),
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FieldIdDocidFacetNumbers(grenad::Reader<CursorClonableMmap>),
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Documents(grenad::Reader<CursorClonableMmap>),
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FieldIdWordcountDocids(grenad::Reader<File>),
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NewDocumentsIds(RoaringBitmap),
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WordDocids {
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word_docids_reader: grenad::Reader<File>,
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exact_word_docids_reader: grenad::Reader<File>,
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},
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WordPositionDocids(grenad::Reader<File>),
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WordPairProximityDocids(grenad::Reader<File>),
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FieldIdFacetStringDocids(grenad::Reader<File>),
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FieldIdFacetNumberDocids(grenad::Reader<File>),
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GeoPoints(grenad::Reader<File>),
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}
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/// Write typed chunk in the corresponding LMDB database of the provided index.
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/// Return new documents seen.
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pub(crate) fn write_typed_chunk_into_index(
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typed_chunk: TypedChunk,
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index: &Index,
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wtxn: &mut RwTxn,
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index_is_empty: bool,
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) -> Result<(RoaringBitmap, bool)> {
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let mut is_merged_database = false;
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match typed_chunk {
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TypedChunk::DocidWordPositions(docid_word_positions_iter) => {
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write_entries_into_database(
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docid_word_positions_iter,
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&index.docid_word_positions,
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wtxn,
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index_is_empty,
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|value, buffer| {
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// ensure that values are unique and ordered
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let positions = roaring_bitmap_from_u32s_array(value);
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BoRoaringBitmapCodec::serialize_into(&positions, buffer);
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Ok(buffer)
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},
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|new_values, db_values, buffer| {
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let new_values = roaring_bitmap_from_u32s_array(new_values);
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let positions = match BoRoaringBitmapCodec::bytes_decode(db_values) {
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Some(db_values) => new_values | db_values,
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None => new_values, // should not happen
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};
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BoRoaringBitmapCodec::serialize_into(&positions, buffer);
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Ok(())
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},
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)?;
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}
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TypedChunk::Documents(obkv_documents_iter) => {
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let mut cursor = obkv_documents_iter.into_cursor()?;
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while let Some((key, value)) = cursor.move_on_next()? {
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index.documents.remap_types::<ByteSlice, ByteSlice>().put(wtxn, key, value)?;
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}
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}
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TypedChunk::FieldIdWordcountDocids(fid_word_count_docids_iter) => {
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append_entries_into_database(
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fid_word_count_docids_iter,
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&index.field_id_word_count_docids,
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wtxn,
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index_is_empty,
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|value, _buffer| Ok(value),
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merge_cbo_roaring_bitmaps,
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)?;
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is_merged_database = true;
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}
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TypedChunk::NewDocumentsIds(documents_ids) => {
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return Ok((documents_ids, is_merged_database))
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}
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TypedChunk::WordDocids { word_docids_reader, exact_word_docids_reader } => {
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let word_docids_iter = unsafe { as_cloneable_grenad(&word_docids_reader) }?;
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append_entries_into_database(
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word_docids_iter.clone(),
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&index.word_docids,
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wtxn,
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index_is_empty,
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|value, _buffer| Ok(value),
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merge_roaring_bitmaps,
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)?;
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let exact_word_docids_iter = unsafe { as_cloneable_grenad(&exact_word_docids_reader) }?;
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append_entries_into_database(
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exact_word_docids_iter.clone(),
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&index.exact_word_docids,
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wtxn,
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index_is_empty,
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|value, _buffer| Ok(value),
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merge_roaring_bitmaps,
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)?;
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// create fst from word docids
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let fst = merge_word_docids_reader_into_fst(word_docids_iter, exact_word_docids_iter)?;
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let db_fst = index.words_fst(wtxn)?;
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// merge new fst with database fst
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let union_stream = fst.op().add(db_fst.stream()).union();
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let mut builder = fst::SetBuilder::memory();
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builder.extend_stream(union_stream)?;
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let fst = builder.into_set();
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index.put_words_fst(wtxn, &fst)?;
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is_merged_database = true;
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}
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TypedChunk::WordPositionDocids(word_position_docids_iter) => {
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append_entries_into_database(
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word_position_docids_iter,
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&index.word_position_docids,
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wtxn,
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index_is_empty,
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|value, _buffer| Ok(value),
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merge_cbo_roaring_bitmaps,
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)?;
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is_merged_database = true;
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}
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TypedChunk::FieldIdFacetNumberDocids(facet_id_f64_docids_iter) => {
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append_entries_into_database(
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facet_id_f64_docids_iter,
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&index.facet_id_f64_docids,
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wtxn,
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index_is_empty,
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|value, _buffer| Ok(value),
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merge_cbo_roaring_bitmaps,
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)?;
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is_merged_database = true;
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}
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TypedChunk::WordPairProximityDocids(word_pair_proximity_docids_iter) => {
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append_entries_into_database(
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word_pair_proximity_docids_iter,
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&index.word_pair_proximity_docids,
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wtxn,
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index_is_empty,
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|value, _buffer| Ok(value),
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merge_cbo_roaring_bitmaps,
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)?;
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is_merged_database = true;
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}
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TypedChunk::FieldIdDocidFacetNumbers(fid_docid_facet_number) => {
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let index_fid_docid_facet_numbers =
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index.field_id_docid_facet_f64s.remap_types::<ByteSlice, ByteSlice>();
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let mut cursor = fid_docid_facet_number.into_cursor()?;
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while let Some((key, value)) = cursor.move_on_next()? {
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if valid_lmdb_key(key) {
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index_fid_docid_facet_numbers.put(wtxn, key, &value)?;
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}
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}
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}
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TypedChunk::FieldIdDocidFacetStrings(fid_docid_facet_string) => {
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let index_fid_docid_facet_strings =
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index.field_id_docid_facet_strings.remap_types::<ByteSlice, ByteSlice>();
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let mut cursor = fid_docid_facet_string.into_cursor()?;
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while let Some((key, value)) = cursor.move_on_next()? {
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if valid_lmdb_key(key) {
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index_fid_docid_facet_strings.put(wtxn, key, &value)?;
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}
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}
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}
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TypedChunk::FieldIdFacetStringDocids(facet_id_string_docids) => {
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append_entries_into_database(
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facet_id_string_docids,
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&index.facet_id_string_docids,
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wtxn,
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index_is_empty,
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|value, _buffer| Ok(value),
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|new_values, db_values, buffer| {
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let (_, new_values) = decode_prefix_string(new_values).unwrap();
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let new_values = RoaringBitmap::deserialize_from(new_values)?;
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let (db_original, db_values) = decode_prefix_string(db_values).unwrap();
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let db_values = RoaringBitmap::deserialize_from(db_values)?;
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let values = new_values | db_values;
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encode_prefix_string(db_original, buffer)?;
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Ok(values.serialize_into(buffer)?)
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},
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)?;
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is_merged_database = true;
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}
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TypedChunk::GeoPoints(geo_points) => {
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let mut rtree = index.geo_rtree(wtxn)?.unwrap_or_default();
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let mut geo_faceted_docids = index.geo_faceted_documents_ids(wtxn)?;
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let mut cursor = geo_points.into_cursor()?;
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while let Some((key, value)) = cursor.move_on_next()? {
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// convert the key back to a u32 (4 bytes)
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let docid = key.try_into().map(DocumentId::from_be_bytes).unwrap();
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// convert the latitude and longitude back to a f64 (8 bytes)
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let (lat, tail) = helpers::try_split_array_at::<u8, 8>(value).unwrap();
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let (lng, _) = helpers::try_split_array_at::<u8, 8>(tail).unwrap();
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let point = [f64::from_ne_bytes(lat), f64::from_ne_bytes(lng)];
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let xyz_point = lat_lng_to_xyz(&point);
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rtree.insert(GeoPoint::new(xyz_point, (docid, point)));
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geo_faceted_docids.insert(docid);
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}
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index.put_geo_rtree(wtxn, &rtree)?;
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index.put_geo_faceted_documents_ids(wtxn, &geo_faceted_docids)?;
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}
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}
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Ok((RoaringBitmap::new(), is_merged_database))
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}
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fn merge_word_docids_reader_into_fst(
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word_docids_iter: grenad::Reader<io::Cursor<ClonableMmap>>,
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exact_word_docids_iter: grenad::Reader<io::Cursor<ClonableMmap>>,
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) -> Result<fst::Set<Vec<u8>>> {
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let mut merger_builder = MergerBuilder::new(merge_nothing as MergeFn);
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merger_builder.push(word_docids_iter.into_cursor()?);
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merger_builder.push(exact_word_docids_iter.into_cursor()?);
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let mut iter = merger_builder.build().into_stream_merger_iter()?;
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let mut builder = fst::SetBuilder::memory();
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while let Some((k, _)) = iter.next()? {
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builder.insert(k)?;
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}
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Ok(builder.into_set())
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}
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fn merge_roaring_bitmaps(new_value: &[u8], db_value: &[u8], buffer: &mut Vec<u8>) -> Result<()> {
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let new_value = RoaringBitmap::deserialize_from(new_value)?;
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let db_value = RoaringBitmap::deserialize_from(db_value)?;
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let value = new_value | db_value;
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Ok(serialize_roaring_bitmap(&value, buffer)?)
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}
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fn merge_cbo_roaring_bitmaps(
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new_value: &[u8],
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db_value: &[u8],
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buffer: &mut Vec<u8>,
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) -> Result<()> {
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Ok(CboRoaringBitmapCodec::merge_into(
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&[Cow::Borrowed(db_value), Cow::Borrowed(new_value)],
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buffer,
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)?)
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}
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/// Write provided entries in database using serialize_value function.
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/// merge_values function is used if an entry already exist in the database.
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fn write_entries_into_database<R, K, V, FS, FM>(
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data: grenad::Reader<R>,
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database: &heed::Database<K, V>,
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wtxn: &mut RwTxn,
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index_is_empty: bool,
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serialize_value: FS,
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merge_values: FM,
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) -> Result<()>
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where
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R: io::Read + io::Seek,
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FS: for<'a> Fn(&'a [u8], &'a mut Vec<u8>) -> Result<&'a [u8]>,
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FM: Fn(&[u8], &[u8], &mut Vec<u8>) -> Result<()>,
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{
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let mut buffer = Vec::new();
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let database = database.remap_types::<ByteSlice, ByteSlice>();
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let mut cursor = data.into_cursor()?;
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while let Some((key, value)) = cursor.move_on_next()? {
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if valid_lmdb_key(key) {
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buffer.clear();
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let value = if index_is_empty {
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serialize_value(value, &mut buffer)?
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} else {
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match database.get(wtxn, key)? {
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Some(prev_value) => {
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merge_values(value, prev_value, &mut buffer)?;
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&buffer[..]
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}
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None => serialize_value(value, &mut buffer)?,
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}
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};
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database.put(wtxn, key, value)?;
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}
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}
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Ok(())
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}
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/// Write provided entries in database using serialize_value function.
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/// merge_values function is used if an entry already exist in the database.
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/// All provided entries must be ordered.
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/// If the index is not empty, write_entries_into_database is called instead.
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fn append_entries_into_database<R, K, V, FS, FM>(
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data: grenad::Reader<R>,
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database: &heed::Database<K, V>,
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wtxn: &mut RwTxn,
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index_is_empty: bool,
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serialize_value: FS,
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merge_values: FM,
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) -> Result<()>
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where
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R: io::Read + io::Seek,
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FS: for<'a> Fn(&'a [u8], &'a mut Vec<u8>) -> Result<&'a [u8]>,
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FM: Fn(&[u8], &[u8], &mut Vec<u8>) -> Result<()>,
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{
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if !index_is_empty {
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return write_entries_into_database(
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data,
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database,
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wtxn,
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false,
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serialize_value,
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merge_values,
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);
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}
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let mut buffer = Vec::new();
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let mut database = database.iter_mut(wtxn)?.remap_types::<ByteSlice, ByteSlice>();
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let mut cursor = data.into_cursor()?;
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while let Some((key, value)) = cursor.move_on_next()? {
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if valid_lmdb_key(key) {
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buffer.clear();
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let value = serialize_value(value, &mut buffer)?;
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unsafe { database.append(key, value)? };
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}
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}
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Ok(())
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}
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