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Tamo 2021-06-16 18:33:33 +02:00
parent ba30cef987
commit 9716fb3b36
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68 changed files with 3327 additions and 2336 deletions
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298
milli/src/index.rs
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@ -3,23 +3,22 @@ use std::collections::{HashMap, HashSet};
use std::path::Path;
use chrono::{DateTime, Utc};
use heed::{Database, PolyDatabase, RoTxn, RwTxn};
use heed::types::*;
use heed::{Database, PolyDatabase, RoTxn, RwTxn};
use roaring::RoaringBitmap;
use crate::error::{UserError, FieldIdMapMissingEntry, InternalError};
use crate::{Criterion, default_criteria, FacetDistribution, FieldsDistribution, Search};
use crate::{BEU32, DocumentId, ExternalDocumentsIds, FieldId, Result};
use crate::{
BEU32StrCodec, BoRoaringBitmapCodec, CboRoaringBitmapCodec,
ObkvCodec, RoaringBitmapCodec, RoaringBitmapLenCodec, StrLevelPositionCodec, StrStrU8Codec,
FieldIdWordCountCodec,
};
use crate::heed_codec::facet::{
FieldDocIdFacetF64Codec, FieldDocIdFacetStringCodec,
FacetValueStringCodec, FacetLevelValueF64Codec,
};
use crate::error::{FieldIdMapMissingEntry, InternalError, UserError};
use crate::fields_ids_map::FieldsIdsMap;
use crate::heed_codec::facet::{
FacetLevelValueF64Codec, FacetValueStringCodec, FieldDocIdFacetF64Codec,
FieldDocIdFacetStringCodec,
};
use crate::{
default_criteria, BEU32StrCodec, BoRoaringBitmapCodec, CboRoaringBitmapCodec, Criterion,
DocumentId, ExternalDocumentsIds, FacetDistribution, FieldId, FieldIdWordCountCodec,
FieldsDistribution, ObkvCodec, Result, RoaringBitmapCodec, RoaringBitmapLenCodec, Search,
StrLevelPositionCodec, StrStrU8Codec, BEU32,
};
pub mod main_key {
pub const CRITERIA_KEY: &str = "criteria";
@ -114,14 +113,17 @@ impl Index {
let word_prefix_docids = env.create_database(Some(WORD_PREFIX_DOCIDS))?;
let docid_word_positions = env.create_database(Some(DOCID_WORD_POSITIONS))?;
let word_pair_proximity_docids = env.create_database(Some(WORD_PAIR_PROXIMITY_DOCIDS))?;
let word_prefix_pair_proximity_docids = env.create_database(Some(WORD_PREFIX_PAIR_PROXIMITY_DOCIDS))?;
let word_prefix_pair_proximity_docids =
env.create_database(Some(WORD_PREFIX_PAIR_PROXIMITY_DOCIDS))?;
let word_level_position_docids = env.create_database(Some(WORD_LEVEL_POSITION_DOCIDS))?;
let field_id_word_count_docids = env.create_database(Some(FIELD_ID_WORD_COUNT_DOCIDS))?;
let word_prefix_level_position_docids = env.create_database(Some(WORD_PREFIX_LEVEL_POSITION_DOCIDS))?;
let word_prefix_level_position_docids =
env.create_database(Some(WORD_PREFIX_LEVEL_POSITION_DOCIDS))?;
let facet_id_f64_docids = env.create_database(Some(FACET_ID_F64_DOCIDS))?;
let facet_id_string_docids = env.create_database(Some(FACET_ID_STRING_DOCIDS))?;
let field_id_docid_facet_f64s = env.create_database(Some(FIELD_ID_DOCID_FACET_F64S))?;
let field_id_docid_facet_strings = env.create_database(Some(FIELD_ID_DOCID_FACET_STRINGS))?;
let field_id_docid_facet_strings =
env.create_database(Some(FIELD_ID_DOCID_FACET_STRINGS))?;
let documents = env.create_database(Some(DOCUMENTS))?;
Index::initialize_creation_dates(&env, main)?;
@ -184,18 +186,26 @@ impl Index {
/* documents ids */
/// Writes the documents ids that corresponds to the user-ids-documents-ids FST.
pub(crate) fn put_documents_ids(&self, wtxn: &mut RwTxn, docids: &RoaringBitmap) -> heed::Result<()> {
pub(crate) fn put_documents_ids(
&self,
wtxn: &mut RwTxn,
docids: &RoaringBitmap,
) -> heed::Result<()> {
self.main.put::<_, Str, RoaringBitmapCodec>(wtxn, main_key::DOCUMENTS_IDS_KEY, docids)
}
/// Returns the internal documents ids.
pub fn documents_ids(&self, rtxn: &RoTxn) -> heed::Result<RoaringBitmap> {
Ok(self.main.get::<_, Str, RoaringBitmapCodec>(rtxn, main_key::DOCUMENTS_IDS_KEY)?.unwrap_or_default())
Ok(self
.main
.get::<_, Str, RoaringBitmapCodec>(rtxn, main_key::DOCUMENTS_IDS_KEY)?
.unwrap_or_default())
}
/// Returns the number of documents indexed in the database.
pub fn number_of_documents(&self, rtxn: &RoTxn) -> Result<u64> {
let count = self.main.get::<_, Str, RoaringBitmapLenCodec>(rtxn, main_key::DOCUMENTS_IDS_KEY)?;
let count =
self.main.get::<_, Str, RoaringBitmapLenCodec>(rtxn, main_key::DOCUMENTS_IDS_KEY)?;
Ok(count.unwrap_or_default())
}
@ -224,21 +234,30 @@ impl Index {
&self,
wtxn: &mut RwTxn,
external_documents_ids: &ExternalDocumentsIds<'a>,
) -> heed::Result<()>
{
) -> heed::Result<()> {
let ExternalDocumentsIds { hard, soft } = external_documents_ids;
let hard = hard.as_fst().as_bytes();
let soft = soft.as_fst().as_bytes();
self.main.put::<_, Str, ByteSlice>(wtxn, main_key::HARD_EXTERNAL_DOCUMENTS_IDS_KEY, hard)?;
self.main.put::<_, Str, ByteSlice>(wtxn, main_key::SOFT_EXTERNAL_DOCUMENTS_IDS_KEY, soft)?;
self.main.put::<_, Str, ByteSlice>(
wtxn,
main_key::HARD_EXTERNAL_DOCUMENTS_IDS_KEY,
hard,
)?;
self.main.put::<_, Str, ByteSlice>(
wtxn,
main_key::SOFT_EXTERNAL_DOCUMENTS_IDS_KEY,
soft,
)?;
Ok(())
}
/// Returns the external documents ids map which associate the external ids
/// with the internal ids (i.e. `u32`).
pub fn external_documents_ids<'t>(&self, rtxn: &'t RoTxn) -> Result<ExternalDocumentsIds<'t>> {
let hard = self.main.get::<_, Str, ByteSlice>(rtxn, main_key::HARD_EXTERNAL_DOCUMENTS_IDS_KEY)?;
let soft = self.main.get::<_, Str, ByteSlice>(rtxn, main_key::SOFT_EXTERNAL_DOCUMENTS_IDS_KEY)?;
let hard =
self.main.get::<_, Str, ByteSlice>(rtxn, main_key::HARD_EXTERNAL_DOCUMENTS_IDS_KEY)?;
let soft =
self.main.get::<_, Str, ByteSlice>(rtxn, main_key::SOFT_EXTERNAL_DOCUMENTS_IDS_KEY)?;
let hard = match hard {
Some(hard) => fst::Map::new(hard)?.map_data(Cow::Borrowed)?,
None => fst::Map::default().map_data(Cow::Owned)?,
@ -254,42 +273,62 @@ impl Index {
/// Writes the fields ids map which associate the documents keys with an internal field id
/// (i.e. `u8`), this field id is used to identify fields in the obkv documents.
pub(crate) fn put_fields_ids_map(&self, wtxn: &mut RwTxn, map: &FieldsIdsMap) -> heed::Result<()> {
pub(crate) fn put_fields_ids_map(
&self,
wtxn: &mut RwTxn,
map: &FieldsIdsMap,
) -> heed::Result<()> {
self.main.put::<_, Str, SerdeJson<FieldsIdsMap>>(wtxn, main_key::FIELDS_IDS_MAP_KEY, map)
}
/// Returns the fields ids map which associate the documents keys with an internal field id
/// (i.e. `u8`), this field id is used to identify fields in the obkv documents.
pub fn fields_ids_map(&self, rtxn: &RoTxn) -> heed::Result<FieldsIdsMap> {
Ok(self.main.get::<_, Str, SerdeJson<FieldsIdsMap>>(
rtxn,
main_key::FIELDS_IDS_MAP_KEY,
)?.unwrap_or_default())
Ok(self
.main
.get::<_, Str, SerdeJson<FieldsIdsMap>>(rtxn, main_key::FIELDS_IDS_MAP_KEY)?
.unwrap_or_default())
}
/* fields distribution */
/// Writes the fields distribution which associates every field name with
/// the number of times it occurs in the documents.
pub(crate) fn put_fields_distribution(&self, wtxn: &mut RwTxn, distribution: &FieldsDistribution) -> heed::Result<()> {
self.main.put::<_, Str, SerdeJson<FieldsDistribution>>(wtxn, main_key::FIELDS_DISTRIBUTION_KEY, distribution)
pub(crate) fn put_fields_distribution(
&self,
wtxn: &mut RwTxn,
distribution: &FieldsDistribution,
) -> heed::Result<()> {
self.main.put::<_, Str, SerdeJson<FieldsDistribution>>(
wtxn,
main_key::FIELDS_DISTRIBUTION_KEY,
distribution,
)
}
/// Returns the fields distribution which associates every field name with
/// the number of times it occurs in the documents.
pub fn fields_distribution(&self, rtxn: &RoTxn) -> heed::Result<FieldsDistribution> {
Ok(self.main.get::<_, Str, SerdeJson<FieldsDistribution>>(
rtxn,
main_key::FIELDS_DISTRIBUTION_KEY,
)?.unwrap_or_default())
Ok(self
.main
.get::<_, Str, SerdeJson<FieldsDistribution>>(rtxn, main_key::FIELDS_DISTRIBUTION_KEY)?
.unwrap_or_default())
}
/* displayed fields */
/// Writes the fields that must be displayed in the defined order.
/// There must be not be any duplicate field id.
pub(crate) fn put_displayed_fields(&self, wtxn: &mut RwTxn, fields: &[&str]) -> heed::Result<()> {
self.main.put::<_, Str, SerdeBincode<&[&str]>>(wtxn, main_key::DISPLAYED_FIELDS_KEY, &fields)
pub(crate) fn put_displayed_fields(
&self,
wtxn: &mut RwTxn,
fields: &[&str],
) -> heed::Result<()> {
self.main.put::<_, Str, SerdeBincode<&[&str]>>(
wtxn,
main_key::DISPLAYED_FIELDS_KEY,
&fields,
)
}
/// Deletes the displayed fields ids, this will make the engine to display
@ -313,14 +352,17 @@ impl Index {
for name in fields.into_iter() {
match fields_ids_map.id(name) {
Some(field_id) => fields_ids.push(field_id),
None => return Err(FieldIdMapMissingEntry::FieldName {
field_name: name.to_string(),
process: "Index::displayed_fields_ids",
}.into()),
None => {
return Err(FieldIdMapMissingEntry::FieldName {
field_name: name.to_string(),
process: "Index::displayed_fields_ids",
}
.into())
}
}
}
Ok(Some(fields_ids))
},
}
None => Ok(None),
}
}
@ -328,8 +370,16 @@ impl Index {
/* searchable fields */
/// Writes the searchable fields, when this list is specified, only these are indexed.
pub(crate) fn put_searchable_fields(&self, wtxn: &mut RwTxn, fields: &[&str]) -> heed::Result<()> {
self.main.put::<_, Str, SerdeBincode<&[&str]>>(wtxn, main_key::SEARCHABLE_FIELDS_KEY, &fields)
pub(crate) fn put_searchable_fields(
&self,
wtxn: &mut RwTxn,
fields: &[&str],
) -> heed::Result<()> {
self.main.put::<_, Str, SerdeBincode<&[&str]>>(
wtxn,
main_key::SEARCHABLE_FIELDS_KEY,
&fields,
)
}
/// Deletes the searchable fields, when no fields are specified, all fields are indexed.
@ -352,14 +402,17 @@ impl Index {
for name in fields {
match fields_ids_map.id(name) {
Some(field_id) => fields_ids.push(field_id),
None => return Err(FieldIdMapMissingEntry::FieldName {
field_name: name.to_string(),
process: "Index::searchable_fields_ids",
}.into()),
None => {
return Err(FieldIdMapMissingEntry::FieldName {
field_name: name.to_string(),
process: "Index::searchable_fields_ids",
}
.into())
}
}
}
Ok(Some(fields_ids))
},
}
None => Ok(None),
}
}
@ -367,7 +420,11 @@ impl Index {
/* filterable fields */
/// Writes the filterable fields names in the database.
pub(crate) fn put_filterable_fields(&self, wtxn: &mut RwTxn, fields: &HashSet<String>) -> heed::Result<()> {
pub(crate) fn put_filterable_fields(
&self,
wtxn: &mut RwTxn,
fields: &HashSet<String>,
) -> heed::Result<()> {
self.main.put::<_, Str, SerdeJson<_>>(wtxn, main_key::FILTERABLE_FIELDS_KEY, fields)
}
@ -378,10 +435,10 @@ impl Index {
/// Returns the filterable fields names.
pub fn filterable_fields(&self, rtxn: &RoTxn) -> heed::Result<HashSet<String>> {
Ok(self.main.get::<_, Str, SerdeJson<_>>(
rtxn,
main_key::FILTERABLE_FIELDS_KEY,
)?.unwrap_or_default())
Ok(self
.main
.get::<_, Str, SerdeJson<_>>(rtxn, main_key::FILTERABLE_FIELDS_KEY)?
.unwrap_or_default())
}
/// Identical to `filterable_fields`, but returns ids instead.
@ -394,11 +451,14 @@ impl Index {
match fields_ids_map.id(&name) {
Some(field_id) => {
fields_ids.insert(field_id);
},
None => return Err(FieldIdMapMissingEntry::FieldName {
field_name: name,
process: "Index::filterable_fields_ids",
}.into()),
}
None => {
return Err(FieldIdMapMissingEntry::FieldName {
field_name: name,
process: "Index::filterable_fields_ids",
}
.into())
}
}
}
@ -413,9 +473,8 @@ impl Index {
pub fn faceted_fields(&self, rtxn: &RoTxn) -> Result<HashSet<String>> {
let filterable_fields = self.filterable_fields(rtxn)?;
let distinct_field = self.distinct_field(rtxn)?;
let asc_desc_fields = self.criteria(rtxn)?
.into_iter()
.filter_map(|criterion| match criterion {
let asc_desc_fields =
self.criteria(rtxn)?.into_iter().filter_map(|criterion| match criterion {
Criterion::Asc(field) | Criterion::Desc(field) => Some(field),
_otherwise => None,
});
@ -439,11 +498,14 @@ impl Index {
match fields_ids_map.id(&name) {
Some(field_id) => {
fields_ids.insert(field_id);
},
None => return Err(FieldIdMapMissingEntry::FieldName {
field_name: name,
process: "Index::faceted_fields_ids",
}.into()),
}
None => {
return Err(FieldIdMapMissingEntry::FieldName {
field_name: name,
process: "Index::faceted_fields_ids",
}
.into())
}
}
}
@ -458,8 +520,7 @@ impl Index {
wtxn: &mut RwTxn,
field_id: FieldId,
docids: &RoaringBitmap,
) -> heed::Result<()>
{
) -> heed::Result<()> {
let mut buffer = [0u8; main_key::STRING_FACETED_DOCUMENTS_IDS_PREFIX.len() + 1];
buffer[..main_key::STRING_FACETED_DOCUMENTS_IDS_PREFIX.len()]
.copy_from_slice(main_key::STRING_FACETED_DOCUMENTS_IDS_PREFIX.as_bytes());
@ -472,8 +533,7 @@ impl Index {
&self,
rtxn: &RoTxn,
field_id: FieldId,
) -> heed::Result<RoaringBitmap>
{
) -> heed::Result<RoaringBitmap> {
let mut buffer = [0u8; main_key::STRING_FACETED_DOCUMENTS_IDS_PREFIX.len() + 1];
buffer[..main_key::STRING_FACETED_DOCUMENTS_IDS_PREFIX.len()]
.copy_from_slice(main_key::STRING_FACETED_DOCUMENTS_IDS_PREFIX.as_bytes());
@ -490,8 +550,7 @@ impl Index {
wtxn: &mut RwTxn,
field_id: FieldId,
docids: &RoaringBitmap,
) -> heed::Result<()>
{
) -> heed::Result<()> {
let mut buffer = [0u8; main_key::NUMBER_FACETED_DOCUMENTS_IDS_PREFIX.len() + 1];
buffer[..main_key::NUMBER_FACETED_DOCUMENTS_IDS_PREFIX.len()]
.copy_from_slice(main_key::NUMBER_FACETED_DOCUMENTS_IDS_PREFIX.as_bytes());
@ -504,8 +563,7 @@ impl Index {
&self,
rtxn: &RoTxn,
field_id: FieldId,
) -> heed::Result<RoaringBitmap>
{
) -> heed::Result<RoaringBitmap> {
let mut buffer = [0u8; main_key::NUMBER_FACETED_DOCUMENTS_IDS_PREFIX.len() + 1];
buffer[..main_key::NUMBER_FACETED_DOCUMENTS_IDS_PREFIX.len()]
.copy_from_slice(main_key::NUMBER_FACETED_DOCUMENTS_IDS_PREFIX.as_bytes());
@ -518,7 +576,11 @@ impl Index {
/* distinct field */
pub(crate) fn put_distinct_field(&self, wtxn: &mut RwTxn, distinct_field: &str) -> heed::Result<()> {
pub(crate) fn put_distinct_field(
&self,
wtxn: &mut RwTxn,
distinct_field: &str,
) -> heed::Result<()> {
self.main.put::<_, Str, Str>(wtxn, main_key::DISTINCT_FIELD_KEY, distinct_field)
}
@ -532,7 +594,11 @@ impl Index {
/* criteria */
pub(crate) fn put_criteria(&self, wtxn: &mut RwTxn, criteria: &[Criterion]) -> heed::Result<()> {
pub(crate) fn put_criteria(
&self,
wtxn: &mut RwTxn,
criteria: &[Criterion],
) -> heed::Result<()> {
self.main.put::<_, Str, SerdeJson<&[Criterion]>>(wtxn, main_key::CRITERIA_KEY, &criteria)
}
@ -550,7 +616,11 @@ impl Index {
/* words fst */
/// Writes the FST which is the words dictionary of the engine.
pub(crate) fn put_words_fst<A: AsRef<[u8]>>(&self, wtxn: &mut RwTxn, fst: &fst::Set<A>) -> heed::Result<()> {
pub(crate) fn put_words_fst<A: AsRef<[u8]>>(
&self,
wtxn: &mut RwTxn,
fst: &fst::Set<A>,
) -> heed::Result<()> {
self.main.put::<_, Str, ByteSlice>(wtxn, main_key::WORDS_FST_KEY, fst.as_fst().as_bytes())
}
@ -564,7 +634,11 @@ impl Index {
/* stop words */
pub(crate) fn put_stop_words<A: AsRef<[u8]>>(&self, wtxn: &mut RwTxn, fst: &fst::Set<A>) -> heed::Result<()> {
pub(crate) fn put_stop_words<A: AsRef<[u8]>>(
&self,
wtxn: &mut RwTxn,
fst: &fst::Set<A>,
) -> heed::Result<()> {
self.main.put::<_, Str, ByteSlice>(wtxn, main_key::STOP_WORDS_KEY, fst.as_fst().as_bytes())
}
@ -585,8 +659,7 @@ impl Index {
&self,
wtxn: &mut RwTxn,
synonyms: &HashMap<Vec<String>, Vec<Vec<String>>>,
) -> heed::Result<()>
{
) -> heed::Result<()> {
self.main.put::<_, Str, SerdeBincode<_>>(wtxn, main_key::SYNONYMS_KEY, synonyms)
}
@ -595,15 +668,17 @@ impl Index {
}
pub fn synonyms(&self, rtxn: &RoTxn) -> heed::Result<HashMap<Vec<String>, Vec<Vec<String>>>> {
Ok(self.main.get::<_, Str, SerdeBincode<_>>(rtxn, main_key::SYNONYMS_KEY)?.unwrap_or_default())
Ok(self
.main
.get::<_, Str, SerdeBincode<_>>(rtxn, main_key::SYNONYMS_KEY)?
.unwrap_or_default())
}
pub fn words_synonyms<S: AsRef<str>>(
&self,
rtxn: &RoTxn,
words: &[S],
) -> heed::Result<Option<Vec<Vec<String>>>>
{
) -> heed::Result<Option<Vec<Vec<String>>>> {
let words: Vec<_> = words.iter().map(|s| s.as_ref().to_owned()).collect();
Ok(self.synonyms(rtxn)?.remove(&words))
}
@ -611,8 +686,16 @@ impl Index {
/* words prefixes fst */
/// Writes the FST which is the words prefixes dictionnary of the engine.
pub(crate) fn put_words_prefixes_fst<A: AsRef<[u8]>>(&self, wtxn: &mut RwTxn, fst: &fst::Set<A>) -> heed::Result<()> {
self.main.put::<_, Str, ByteSlice>(wtxn, main_key::WORDS_PREFIXES_FST_KEY, fst.as_fst().as_bytes())
pub(crate) fn put_words_prefixes_fst<A: AsRef<[u8]>>(
&self,
wtxn: &mut RwTxn,
fst: &fst::Set<A>,
) -> heed::Result<()> {
self.main.put::<_, Str, ByteSlice>(
wtxn,
main_key::WORDS_PREFIXES_FST_KEY,
fst.as_fst().as_bytes(),
)
}
/// Returns the FST which is the words prefixes dictionnary of the engine.
@ -637,13 +720,14 @@ impl Index {
pub fn documents<'t>(
&self,
rtxn: &'t RoTxn,
ids: impl IntoIterator<Item=DocumentId>,
) -> Result<Vec<(DocumentId, obkv::KvReader<'t>)>>
{
ids: impl IntoIterator<Item = DocumentId>,
) -> Result<Vec<(DocumentId, obkv::KvReader<'t>)>> {
let mut documents = Vec::new();
for id in ids {
let kv = self.documents.get(rtxn, &BEU32::new(id))?
let kv = self
.documents
.get(rtxn, &BEU32::new(id))?
.ok_or_else(|| UserError::UnknownInternalDocumentId { document_id: id })?;
documents.push((id, kv));
}
@ -673,7 +757,8 @@ impl Index {
/// Returns the index creation time.
pub fn created_at(&self, rtxn: &RoTxn) -> Result<DateTime<Utc>> {
Ok(self.main
Ok(self
.main
.get::<_, Str, SerdeJson<DateTime<Utc>>>(rtxn, main_key::CREATED_AT_KEY)?
.ok_or(InternalError::DatabaseMissingEntry {
db_name: db_name::MAIN,
@ -683,7 +768,8 @@ impl Index {
/// Returns the index last updated time.
pub fn updated_at(&self, rtxn: &RoTxn) -> Result<DateTime<Utc>> {
Ok(self.main
Ok(self
.main
.get::<_, Str, SerdeJson<DateTime<Utc>>>(rtxn, main_key::UPDATED_AT_KEY)?
.ok_or(InternalError::DatabaseMissingEntry {
db_name: db_name::MAIN,
@ -691,7 +777,11 @@ impl Index {
})?)
}
pub(crate) fn set_updated_at(&self, wtxn: &mut RwTxn, time: &DateTime<Utc>) -> heed::Result<()> {
pub(crate) fn set_updated_at(
&self,
wtxn: &mut RwTxn,
time: &DateTime<Utc>,
) -> heed::Result<()> {
self.main.put::<_, Str, SerdeJson<DateTime<Utc>>>(wtxn, main_key::UPDATED_AT_KEY, &time)
}
}
@ -704,8 +794,8 @@ pub(crate) mod tests {
use maplit::hashmap;
use tempfile::TempDir;
use crate::Index;
use crate::update::{IndexDocuments, UpdateFormat};
use crate::Index;
pub(crate) struct TempIndex {
inner: Index,
@ -728,10 +818,7 @@ pub(crate) mod tests {
options.map_size(100 * 4096);
let _tempdir = TempDir::new_in(".").unwrap();
let inner = Index::new(options, _tempdir.path()).unwrap();
Self {
inner,
_tempdir
}
Self { inner, _tempdir }
}
}
@ -756,10 +843,13 @@ pub(crate) mod tests {
let rtxn = index.read_txn().unwrap();
let fields_distribution = index.fields_distribution(&rtxn).unwrap();
assert_eq!(fields_distribution, hashmap! {
"id".to_string() => 2,
"name".to_string() => 2,
"age".to_string() => 1,
});
assert_eq!(
fields_distribution,
hashmap! {
"id".to_string() => 2,
"name".to_string() => 2,
"age".to_string() => 1,
}
);
}
}