mirror of
https://github.com/meilisearch/MeiliSearch
synced 2024-09-22 16:41:45 +02:00
60 lines
2.4 KiB
Rust
60 lines
2.4 KiB
Rust
use std::fs::File;
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use std::io;
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use heed::BytesEncode;
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use super::helpers::{create_sorter, sorter_into_reader, try_split_array_at, GrenadParameters};
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use crate::heed_codec::facet::{FacetGroupKey, FacetGroupKeyCodec};
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use crate::heed_codec::StrRefCodec;
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use crate::update::index_documents::merge_cbo_roaring_bitmaps;
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use crate::{FieldId, Result, MAX_FACET_VALUE_LENGTH};
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/// Extracts the facet string and the documents ids where this facet string appear.
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///
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/// Returns a grenad reader with the list of extracted facet strings and
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/// documents ids from the given chunk of docid facet string positions.
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#[logging_timer::time]
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pub fn extract_facet_string_docids<R: io::Read + io::Seek>(
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docid_fid_facet_string: 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 facet_string_docids_sorter = create_sorter(
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grenad::SortAlgorithm::Stable,
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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 cursor = docid_fid_facet_string.into_cursor()?;
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while let Some((key, _original_value_bytes)) = cursor.move_on_next()? {
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let (field_id_bytes, bytes) = try_split_array_at(key).unwrap();
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let field_id = FieldId::from_be_bytes(field_id_bytes);
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let (document_id_bytes, normalized_value_bytes) =
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try_split_array_at::<_, 4>(bytes).unwrap();
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let document_id = u32::from_be_bytes(document_id_bytes);
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let mut normalised_value = std::str::from_utf8(normalized_value_bytes)?;
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let normalised_truncated_value: String;
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if normalised_value.len() > MAX_FACET_VALUE_LENGTH {
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normalised_truncated_value = normalised_value
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.char_indices()
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.take_while(|(idx, _)| idx + 4 < MAX_FACET_VALUE_LENGTH)
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.map(|(_, c)| c)
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.collect();
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normalised_value = normalised_truncated_value.as_str();
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}
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let key = FacetGroupKey { field_id, level: 0, left_bound: normalised_value };
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let key_bytes = FacetGroupKeyCodec::<StrRefCodec>::bytes_encode(&key).unwrap();
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// document id is encoded in native-endian because of the CBO roaring bitmap codec
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facet_string_docids_sorter.insert(&key_bytes, document_id.to_ne_bytes())?;
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}
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sorter_into_reader(facet_string_docids_sorter, indexer)
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}
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