mirror of
https://github.com/meilisearch/MeiliSearch
synced 2024-09-22 16:41:45 +02:00
50 lines
1.8 KiB
Rust
50 lines
1.8 KiB
Rust
use std::fs::File;
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use std::io;
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use super::helpers::{
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create_sorter, merge_cbo_roaring_bitmaps, read_u32_ne_bytes, sorter_into_reader,
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try_split_array_at, GrenadParameters,
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};
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use crate::error::SerializationError;
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use crate::index::db_name::DOCID_WORD_POSITIONS;
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use crate::{relative_from_absolute_position, DocumentId, Result};
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/// Extracts the word, field id, and the documents ids where this word appear at this field id.
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#[logging_timer::time]
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pub fn extract_word_fid_docids<R: io::Read + io::Seek>(
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docid_word_positions: grenad::Reader<R>,
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indexer: GrenadParameters,
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) -> Result<grenad::Reader<File>> {
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let max_memory = indexer.max_memory_by_thread();
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let mut word_fid_docids_sorter = create_sorter(
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grenad::SortAlgorithm::Unstable,
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merge_cbo_roaring_bitmaps,
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indexer.chunk_compression_type,
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indexer.chunk_compression_level,
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indexer.max_nb_chunks,
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max_memory,
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);
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let mut key_buffer = Vec::new();
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let mut cursor = docid_word_positions.into_cursor()?;
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while let Some((key, value)) = cursor.move_on_next()? {
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let (document_id_bytes, word_bytes) = try_split_array_at(key)
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.ok_or(SerializationError::Decoding { db_name: Some(DOCID_WORD_POSITIONS) })?;
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let document_id = DocumentId::from_be_bytes(document_id_bytes);
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for position in read_u32_ne_bytes(value) {
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key_buffer.clear();
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key_buffer.extend_from_slice(word_bytes);
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key_buffer.push(0);
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let (fid, _) = relative_from_absolute_position(position);
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key_buffer.extend_from_slice(&fid.to_be_bytes());
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word_fid_docids_sorter.insert(&key_buffer, document_id.to_ne_bytes())?;
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}
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}
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let word_fid_docids_reader = sorter_into_reader(word_fid_docids_sorter, indexer)?;
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Ok(word_fid_docids_reader)
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}
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