Merge #665

665: Fixing piles of clippy errors. r=ManyTheFish a=ehiggs

## Related issue
No issue fixed. Simply cleaning up some code for clippy on the march towards a clean build when #659 is merged.

## What does this PR do?
Most of these are calling clone when the struct supports Copy.

Many are using & and &mut on `self` when the function they are called from already has an immutable or mutable borrow so this isn't needed.

I tried to stay away from actual changes or places where I'd have to name fresh variables.

## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

Co-authored-by: Ewan Higgs <ewan.higgs@gmail.com>

milli/src/lib.rs

@@ -195,7 +195,7 @@ pub fn lat_lng_to_xyz(coord: &[f64; 2]) -> [f64; 3] {
 /// Returns `true` if the field match one of the faceted fields.
 /// See the function [`is_faceted_by`] below to see what “matching” means.
 pub fn is_faceted(field: &str, faceted_fields: impl IntoIterator<Item = impl AsRef<str>>) -> bool {
-    faceted_fields.into_iter().find(|facet| is_faceted_by(field, facet.as_ref())).is_some()
+    faceted_fields.into_iter().any(|facet| is_faceted_by(field, facet.as_ref()))
 }
 
 /// Returns `true` if the field match the facet.

milli/src/search/matches/mod.rs

@@ -7,9 +7,9 @@ use serde::Serialize;
 
 pub mod matching_words;
 
-const DEFAULT_CROP_MARKER: &'static str = "…";
+const DEFAULT_CROP_MARKER: &str = "…";
-const DEFAULT_HIGHLIGHT_PREFIX: &'static str = "<em>";
+const DEFAULT_HIGHLIGHT_PREFIX: &str = "<em>";
-const DEFAULT_HIGHLIGHT_SUFFIX: &'static str = "</em>";
+const DEFAULT_HIGHLIGHT_SUFFIX: &str = "</em>";
 
 /// Structure used to build a Matcher allowing to customize formating tags.
 pub struct MatcherBuilder<'a, A> {

milli/src/search/mod.rs

@@ -357,12 +357,10 @@ pub fn word_derivations<'c>(
                 } else if fst.contains(word) {
                     derived_words.push((word.to_string(), 0));
                 }
-            } else {
+            } else if max_typo == 1 {
-                if max_typo == 1 {
                 let dfa = build_dfa(word, 1, is_prefix);
                 let starts = StartsWith(Str::new(get_first(word)));
-                    let mut stream =
+                let mut stream = fst.search_with_state(Intersection(starts, &dfa)).into_stream();
-                        fst.search_with_state(Intersection(starts, &dfa)).into_stream();
 
                 while let Some((word, state)) = stream.next() {
                     let word = std::str::from_utf8(word)?;
@@ -392,7 +390,6 @@ pub fn word_derivations<'c>(
                     }
                 }
             }
-            }
             Ok(entry.insert(derived_words))
         }
     }

milli/src/update/index_documents/extract/extract_fid_word_count_docids.rs

@@ -40,7 +40,7 @@ pub fn extract_fid_word_count_docids<R: io::Read + io::Seek>(
     let mut cursor = docid_word_positions.into_cursor()?;
     while let Some((key, value)) = cursor.move_on_next()? {
         let (document_id_bytes, _word_bytes) = try_split_array_at(key)
-            .ok_or_else(|| SerializationError::Decoding { db_name: Some(DOCID_WORD_POSITIONS) })?;
+            .ok_or(SerializationError::Decoding { db_name: Some(DOCID_WORD_POSITIONS) })?;
         let document_id = u32::from_be_bytes(document_id_bytes);
 
         let curr_document_id = *current_document_id.get_or_insert(document_id);

milli/src/update/index_documents/extract/extract_geo_points.rs

@@ -60,5 +60,5 @@ pub fn extract_geo_points<R: io::Read + io::Seek>(
         }
     }
 
-    Ok(writer_into_reader(writer)?)
+    writer_into_reader(writer)
 }

milli/src/update/index_documents/extract/extract_word_docids.rs

@@ -51,7 +51,7 @@ pub fn extract_word_docids<R: io::Read + io::Seek>(
     let mut cursor = docid_word_positions.into_cursor()?;
     while let Some((key, positions)) = cursor.move_on_next()? {
         let (document_id_bytes, word_bytes) = try_split_array_at(key)
-            .ok_or_else(|| SerializationError::Decoding { db_name: Some(DOCID_WORD_POSITIONS) })?;
+            .ok_or(SerializationError::Decoding { db_name: Some(DOCID_WORD_POSITIONS) })?;
         let document_id = u32::from_be_bytes(document_id_bytes);
 
         let bitmap = RoaringBitmap::from_iter(Some(document_id));

milli/src/update/index_documents/extract/extract_word_pair_proximity_docids.rs

@@ -39,7 +39,7 @@ pub fn extract_word_pair_proximity_docids<R: io::Read + io::Seek>(
     let mut cursor = docid_word_positions.into_cursor()?;
     while let Some((key, value)) = cursor.move_on_next()? {
         let (document_id_bytes, word_bytes) = try_split_array_at(key)
-            .ok_or_else(|| SerializationError::Decoding { db_name: Some(DOCID_WORD_POSITIONS) })?;
+            .ok_or(SerializationError::Decoding { db_name: Some(DOCID_WORD_POSITIONS) })?;
         let document_id = u32::from_be_bytes(document_id_bytes);
         let word = str::from_utf8(word_bytes)?;
 
@@ -81,7 +81,7 @@ pub fn extract_word_pair_proximity_docids<R: io::Read + io::Seek>(
 ///
 /// This list is used by the engine to calculate the documents containing words that are
 /// close to each other.
-fn document_word_positions_into_sorter<'b>(
+fn document_word_positions_into_sorter(
     document_id: DocumentId,
     mut word_positions_heap: BinaryHeap<PeekedWordPosition<vec::IntoIter<u32>>>,
     word_pair_proximity_docids_sorter: &mut grenad::Sorter<MergeFn>,

milli/src/update/index_documents/extract/extract_word_position_docids.rs

@@ -33,7 +33,7 @@ pub fn extract_word_position_docids<R: io::Read + io::Seek>(
     let mut cursor = docid_word_positions.into_cursor()?;
     while let Some((key, value)) = cursor.move_on_next()? {
         let (document_id_bytes, word_bytes) = try_split_array_at(key)
-            .ok_or_else(|| SerializationError::Decoding { db_name: Some(DOCID_WORD_POSITIONS) })?;
+            .ok_or(SerializationError::Decoding { db_name: Some(DOCID_WORD_POSITIONS) })?;
         let document_id = DocumentId::from_be_bytes(document_id_bytes);
 
         for position in read_u32_ne_bytes(value) {

milli/src/update/index_documents/extract/mod.rs

@@ -96,7 +96,7 @@ pub(crate) fn data_from_obkv_documents(
 
     spawn_extraction_task::<_, _, Vec<grenad::Reader<File>>>(
         docid_word_positions_chunks.clone(),
-        indexer.clone(),
+        indexer,
         lmdb_writer_sx.clone(),
         extract_word_pair_proximity_docids,
         merge_cbo_roaring_bitmaps,
@@ -106,7 +106,7 @@ pub(crate) fn data_from_obkv_documents(
 
     spawn_extraction_task::<_, _, Vec<grenad::Reader<File>>>(
         docid_word_positions_chunks.clone(),
-        indexer.clone(),
+        indexer,
         lmdb_writer_sx.clone(),
         extract_fid_word_count_docids,
         merge_cbo_roaring_bitmaps,
@@ -116,7 +116,7 @@ pub(crate) fn data_from_obkv_documents(
 
     spawn_extraction_task::<_, _, Vec<(grenad::Reader<File>, grenad::Reader<File>)>>(
         docid_word_positions_chunks.clone(),
-        indexer.clone(),
+        indexer,
         lmdb_writer_sx.clone(),
         move |doc_word_pos, indexer| extract_word_docids(doc_word_pos, indexer, &exact_attributes),
         merge_roaring_bitmaps,
@@ -128,8 +128,8 @@ pub(crate) fn data_from_obkv_documents(
     );
 
     spawn_extraction_task::<_, _, Vec<grenad::Reader<File>>>(
-        docid_word_positions_chunks.clone(),
+        docid_word_positions_chunks,
-        indexer.clone(),
+        indexer,
         lmdb_writer_sx.clone(),
         extract_word_position_docids,
         merge_cbo_roaring_bitmaps,
@@ -138,8 +138,8 @@ pub(crate) fn data_from_obkv_documents(
     );
 
     spawn_extraction_task::<_, _, Vec<grenad::Reader<File>>>(
-        docid_fid_facet_strings_chunks.clone(),
+        docid_fid_facet_strings_chunks,
-        indexer.clone(),
+        indexer,
         lmdb_writer_sx.clone(),
         extract_facet_string_docids,
         keep_first_prefix_value_merge_roaring_bitmaps,
@@ -148,8 +148,8 @@ pub(crate) fn data_from_obkv_documents(
     );
 
     spawn_extraction_task::<_, _, Vec<grenad::Reader<File>>>(
-        docid_fid_facet_numbers_chunks.clone(),
+        docid_fid_facet_numbers_chunks,
-        indexer.clone(),
+        indexer,
         lmdb_writer_sx.clone(),
         extract_facet_number_docids,
         merge_cbo_roaring_bitmaps,
@@ -183,12 +183,12 @@ fn spawn_extraction_task<FE, FS, M>(
 {
     rayon::spawn(move || {
         let chunks: Result<M> =
-            chunks.into_par_iter().map(|chunk| extract_fn(chunk, indexer.clone())).collect();
+            chunks.into_par_iter().map(|chunk| extract_fn(chunk, indexer)).collect();
         rayon::spawn(move || match chunks {
             Ok(chunks) => {
                 debug!("merge {} database", name);
                 let reader = chunks.merge(merge_fn, &indexer);
-                let _ = lmdb_writer_sx.send(reader.map(|r| serialize_fn(r)));
+                let _ = lmdb_writer_sx.send(reader.map(serialize_fn));
             }
             Err(e) => {
                 let _ = lmdb_writer_sx.send(Err(e));
@@ -255,7 +255,7 @@ fn send_and_extract_flattened_documents_data(
             || {
                 let (documents_ids, docid_word_positions_chunk) = extract_docid_word_positions(
                     flattened_documents_chunk.clone(),
-                    indexer.clone(),
+                    indexer,
                     searchable_fields,
                     stop_words.as_ref(),
                     max_positions_per_attributes,
@@ -279,7 +279,7 @@ fn send_and_extract_flattened_documents_data(
                     fid_facet_exists_docids_chunk,
                 ) = extract_fid_docid_facet_values(
                     flattened_documents_chunk.clone(),
-                    indexer.clone(),
+                    indexer,
                     faceted_fields,
                 )?;
 

milli/src/update/index_documents/helpers/grenad_helpers.rs

@@ -61,7 +61,7 @@ pub fn sorter_into_reader(
     );
     sorter.write_into_stream_writer(&mut writer)?;
 
-    Ok(writer_into_reader(writer)?)
+    writer_into_reader(writer)
 }
 
 pub fn writer_into_reader(writer: grenad::Writer<File>) -> Result<grenad::Reader<File>> {
@@ -134,7 +134,7 @@ impl<R: io::Read + io::Seek> MergerBuilder<R> {
         );
         merger.write_into_stream_writer(&mut writer)?;
 
-        Ok(writer_into_reader(writer)?)
+        writer_into_reader(writer)
     }
 }
 
@@ -180,7 +180,6 @@ pub fn grenad_obkv_into_chunks<R: io::Read + io::Seek>(
     let mut continue_reading = true;
     let mut cursor = reader.into_cursor()?;
 
-    let indexer_clone = indexer.clone();
     let mut transposer = move || {
         if !continue_reading {
             return Ok(None);
@@ -188,8 +187,8 @@ pub fn grenad_obkv_into_chunks<R: io::Read + io::Seek>(
 
         let mut current_chunk_size = 0u64;
         let mut obkv_documents = create_writer(
-            indexer_clone.chunk_compression_type,
+            indexer.chunk_compression_type,
-            indexer_clone.chunk_compression_level,
+            indexer.chunk_compression_level,
             tempfile::tempfile()?,
         );
 
@@ -224,7 +223,7 @@ pub fn write_into_lmdb_database(
         match iter.next().transpose()? {
             Some((key, old_val)) if key == k => {
                 let vals = &[Cow::Borrowed(old_val), Cow::Borrowed(v)][..];
-                let val = merge(k, &vals)?;
+                let val = merge(k, vals)?;
                 // safety: we don't keep references from inside the LMDB database.
                 unsafe { iter.put_current(k, &val)? };
             }

milli/src/update/index_documents/helpers/merge_functions.rs

@@ -88,7 +88,7 @@ pub fn keep_latest_obkv<'a>(_key: &[u8], obkvs: &[Cow<'a, [u8]>]) -> Result<Cow<
 /// Merge all the obks in the order we see them.
 pub fn merge_obkvs<'a>(_key: &[u8], obkvs: &[Cow<'a, [u8]>]) -> Result<Cow<'a, [u8]>> {
     Ok(obkvs
-        .into_iter()
+        .iter()
         .cloned()
         .reduce(|acc, current| {
             let first = obkv::KvReader::new(&acc);

milli/src/update/index_documents/mod.rs

@@ -106,7 +106,7 @@ where
     ) -> Result<IndexDocuments<'t, 'u, 'i, 'a, F>> {
         let transform = Some(Transform::new(
             wtxn,
-            &index,
+            index,
             indexer_config,
             config.update_method,
             config.autogenerate_docids,
@@ -291,18 +291,12 @@ where
         // Run extraction pipeline in parallel.
         pool.install(|| {
             // split obkv file into several chunks
-            let original_chunk_iter = grenad_obkv_into_chunks(
+            let original_chunk_iter =
-                original_documents,
+                grenad_obkv_into_chunks(original_documents, pool_params, documents_chunk_size);
-                pool_params.clone(),
-                documents_chunk_size,
-            );
 
             // split obkv file into several chunks
-            let flattened_chunk_iter = grenad_obkv_into_chunks(
+            let flattened_chunk_iter =
-                flattened_documents,
+                grenad_obkv_into_chunks(flattened_documents, pool_params, documents_chunk_size);
-                pool_params.clone(),
-                documents_chunk_size,
-            );
 
             let result = original_chunk_iter.and_then(|original_chunk| {
                 let flattened_chunk = flattened_chunk_iter?;
@@ -341,7 +335,7 @@ where
         }
 
         let index_documents_ids = self.index.documents_ids(self.wtxn)?;
-        let index_is_empty = index_documents_ids.len() == 0;
+        let index_is_empty = index_documents_ids.is_empty();
         let mut final_documents_ids = RoaringBitmap::new();
         let mut word_pair_proximity_docids = None;
         let mut word_position_docids = None;
@@ -378,7 +372,7 @@ where
             };
 
             let (docids, is_merged_database) =
-                write_typed_chunk_into_index(typed_chunk, &self.index, self.wtxn, index_is_empty)?;
+                write_typed_chunk_into_index(typed_chunk, self.index, self.wtxn, index_is_empty)?;
             if !docids.is_empty() {
                 final_documents_ids |= docids;
                 let documents_seen_count = final_documents_ids.len();
@@ -475,7 +469,7 @@ where
         );
         let common_prefix_fst_words: Vec<_> = common_prefix_fst_words
             .as_slice()
-            .linear_group_by_key(|x| x.chars().nth(0).unwrap())
+            .linear_group_by_key(|x| x.chars().next().unwrap())
             .collect();
 
         // We retrieve the newly added words between the previous and new prefix word fst.
@@ -498,9 +492,9 @@ where
             execute_word_prefix_docids(
                 self.wtxn,
                 word_docids,
-                self.index.word_docids.clone(),
+                self.index.word_docids,
-                self.index.word_prefix_docids.clone(),
+                self.index.word_prefix_docids,
-                &self.indexer_config,
+                self.indexer_config,
                 &new_prefix_fst_words,
                 &common_prefix_fst_words,
                 &del_prefix_fst_words,
@@ -511,9 +505,9 @@ where
             execute_word_prefix_docids(
                 self.wtxn,
                 exact_word_docids,
-                self.index.exact_word_docids.clone(),
+                self.index.exact_word_docids,
-                self.index.exact_word_prefix_docids.clone(),
+                self.index.exact_word_prefix_docids,
-                &self.indexer_config,
+                self.indexer_config,
                 &new_prefix_fst_words,
                 &common_prefix_fst_words,
                 &del_prefix_fst_words,
@@ -595,12 +589,7 @@ fn execute_word_prefix_docids(
     builder.chunk_compression_level = indexer_config.chunk_compression_level;
     builder.max_nb_chunks = indexer_config.max_nb_chunks;
     builder.max_memory = indexer_config.max_memory;
-    builder.execute(
+    builder.execute(cursor, new_prefix_fst_words, common_prefix_fst_words, del_prefix_fst_words)?;
-        cursor,
-        &new_prefix_fst_words,
-        &common_prefix_fst_words,
-        &del_prefix_fst_words,
-    )?;
     Ok(())
 }
 

milli/src/update/index_documents/transform.rs

@@ -72,10 +72,10 @@ fn create_fields_mapping(
         // we sort by id here to ensure a deterministic mapping of the fields, that preserves
         // the original ordering.
         .sorted_by_key(|(&id, _)| id)
-        .map(|(field, name)| match index_field_map.id(&name) {
+        .map(|(field, name)| match index_field_map.id(name) {
             Some(id) => Ok((*field, id)),
             None => index_field_map
-                .insert(&name)
+                .insert(name)
                 .ok_or(Error::UserError(UserError::AttributeLimitReached))
                 .map(|id| (*field, id)),
         })
@@ -192,7 +192,7 @@ impl<'a, 'i> Transform<'a, 'i> {
             // Insertion in a obkv need to be done with keys ordered. For now they are ordered
             // according to the document addition key order, so we sort it according to the
             // fieldids map keys order.
-            field_buffer_cache.sort_unstable_by(|(f1, _), (f2, _)| f1.cmp(&f2));
+            field_buffer_cache.sort_unstable_by(|(f1, _), (f2, _)| f1.cmp(f2));
 
             // Build the new obkv document.
             let mut writer = obkv::KvWriter::new(&mut obkv_buffer);
@@ -202,8 +202,7 @@ impl<'a, 'i> Transform<'a, 'i> {
 
             let mut original_docid = None;
 
-            let docid =
+            let docid = match self.new_external_documents_ids_builder.entry((*external_id).into()) {
-                match self.new_external_documents_ids_builder.entry(external_id.clone().into()) {
                 Entry::Occupied(entry) => *entry.get() as u32,
                 Entry::Vacant(entry) => {
                     // If the document was already in the db we mark it as a replaced document.
@@ -239,12 +238,12 @@ impl<'a, 'i> Transform<'a, 'i> {
                     // we're not replacing anything
                     self.replaced_documents_ids.remove(original_docid);
                     // and we need to put back the original id as it was before
-                    self.new_external_documents_ids_builder.remove(&*external_id);
+                    self.new_external_documents_ids_builder.remove(external_id);
                     skip_insertion = true;
                 } else {
                     // we associate the base document with the new key, everything will get merged later.
                     self.original_sorter.insert(&docid.to_be_bytes(), base_obkv)?;
-                    match self.flatten_from_fields_ids_map(KvReader::new(&base_obkv))? {
+                    match self.flatten_from_fields_ids_map(KvReader::new(base_obkv))? {
                         Some(buffer) => {
                             self.flattened_sorter.insert(docid.to_be_bytes(), &buffer)?
                         }
@@ -453,7 +452,7 @@ impl<'a, 'i> Transform<'a, 'i> {
     {
         let primary_key = self
             .index
-            .primary_key(&wtxn)?
+            .primary_key(wtxn)?
             .ok_or(Error::UserError(UserError::MissingPrimaryKey))?
             .to_string();
 
@@ -520,7 +519,7 @@ impl<'a, 'i> Transform<'a, 'i> {
             self.new_external_documents_ids_builder.into_iter().collect();
 
         new_external_documents_ids_builder
-            .sort_unstable_by(|(left, _), (right, _)| left.cmp(&right));
+            .sort_unstable_by(|(left, _), (right, _)| left.cmp(right));
         let mut fst_new_external_documents_ids_builder = fst::MapBuilder::memory();
         new_external_documents_ids_builder.into_iter().try_for_each(|(key, value)| {
             fst_new_external_documents_ids_builder.insert(key, value)
@@ -614,7 +613,7 @@ impl<'a, 'i> Transform<'a, 'i> {
             let mut flattened: Vec<_> = flattened.into_iter().collect();
             // we reorder the field to get all the known field first
             flattened.sort_unstable_by_key(|(key, _)| {
-                new_fields_ids_map.id(&key).unwrap_or(FieldId::MAX)
+                new_fields_ids_map.id(key).unwrap_or(FieldId::MAX)
             });
 
             for (key, value) in flattened {

milli/src/update/index_documents/typed_chunk.rs

@@ -175,7 +175,7 @@ pub(crate) fn write_typed_chunk_into_index(
             let mut cursor = fid_docid_facet_number.into_cursor()?;
             while let Some((key, value)) = cursor.move_on_next()? {
                 if valid_lmdb_key(key) {
-                    index_fid_docid_facet_numbers.put(wtxn, key, &value)?;
+                    index_fid_docid_facet_numbers.put(wtxn, key, value)?;
                 }
             }
         }
@@ -185,7 +185,7 @@ pub(crate) fn write_typed_chunk_into_index(
             let mut cursor = fid_docid_facet_string.into_cursor()?;
             while let Some((key, value)) = cursor.move_on_next()? {
                 if valid_lmdb_key(key) {
-                    index_fid_docid_facet_strings.put(wtxn, key, &value)?;
+                    index_fid_docid_facet_strings.put(wtxn, key, value)?;
                 }
             }
         }

milli/src/update/settings.rs

@@ -15,7 +15,7 @@ use crate::update::index_documents::IndexDocumentsMethod;
 use crate::update::{ClearDocuments, IndexDocuments, UpdateIndexingStep};
 use crate::{FieldsIdsMap, Index, Result};
 
-#[derive(Debug, Clone, PartialEq, Copy)]
+#[derive(Debug, Clone, PartialEq, Eq, Copy)]
 pub enum Setting<T> {
     Set(T),
     Reset,
@@ -273,24 +273,21 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
         let fields_ids_map = self.index.fields_ids_map(self.wtxn)?;
         // if the settings are set before any document update, we don't need to do anything, and
         // will set the primary key during the first document addition.
-        if self.index.number_of_documents(&self.wtxn)? == 0 {
+        if self.index.number_of_documents(self.wtxn)? == 0 {
             return Ok(());
         }
 
         let transform = Transform::new(
             self.wtxn,
-            &self.index,
+            self.index,
-            &self.indexer_config,
+            self.indexer_config,
             IndexDocumentsMethod::ReplaceDocuments,
             false,
         )?;
 
         // We remap the documents fields based on the new `FieldsIdsMap`.
-        let output = transform.remap_index_documents(
+        let output =
-            self.wtxn,
+            transform.remap_index_documents(self.wtxn, old_fields_ids_map, fields_ids_map)?;
-            old_fields_ids_map,
-            fields_ids_map.clone(),
-        )?;
 
         let new_facets = output.compute_real_facets(self.wtxn, self.index)?;
         self.index.put_faceted_fields(self.wtxn, &new_facets)?;
@@ -303,7 +300,7 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
         let indexing_builder = IndexDocuments::new(
             self.wtxn,
             self.index,
-            &self.indexer_config,
+            self.indexer_config,
             IndexDocumentsConfig::default(),
             &cb,
         )?;
@@ -330,7 +327,7 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
     fn update_distinct_field(&mut self) -> Result<bool> {
         match self.distinct_field {
             Setting::Set(ref attr) => {
-                self.index.put_distinct_field(self.wtxn, &attr)?;
+                self.index.put_distinct_field(self.wtxn, attr)?;
             }
             Setting::Reset => {
                 self.index.delete_distinct_field(self.wtxn)?;
@@ -356,11 +353,11 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
                 // Add all the searchable attributes to the field map, and then add the
                 // remaining fields from the old field map to the new one
                 for name in names.iter() {
-                    new_fields_ids_map.insert(&name).ok_or(UserError::AttributeLimitReached)?;
+                    new_fields_ids_map.insert(name).ok_or(UserError::AttributeLimitReached)?;
                 }
 
                 for (_, name) in old_fields_ids_map.iter() {
-                    new_fields_ids_map.insert(&name).ok_or(UserError::AttributeLimitReached)?;
+                    new_fields_ids_map.insert(name).ok_or(UserError::AttributeLimitReached)?;
                 }
 
                 self.index.put_all_searchable_fields_from_fields_ids_map(
@@ -462,11 +459,11 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
         match self.exact_attributes {
             Setting::Set(ref attrs) => {
                 let attrs = attrs.iter().map(String::as_str).collect::<Vec<_>>();
-                self.index.put_exact_attributes(&mut self.wtxn, &attrs)?;
+                self.index.put_exact_attributes(self.wtxn, &attrs)?;
                 Ok(true)
             }
             Setting::Reset => {
-                self.index.delete_exact_attributes(&mut self.wtxn)?;
+                self.index.delete_exact_attributes(self.wtxn)?;
                 Ok(true)
             }
             Setting::NotSet => Ok(false),
@@ -528,7 +525,7 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
     fn update_primary_key(&mut self) -> Result<()> {
         match self.primary_key {
             Setting::Set(ref primary_key) => {
-                if self.index.number_of_documents(&self.wtxn)? == 0 {
+                if self.index.number_of_documents(self.wtxn)? == 0 {
                     let mut fields_ids_map = self.index.fields_ids_map(self.wtxn)?;
                     fields_ids_map.insert(primary_key).ok_or(UserError::AttributeLimitReached)?;
                     self.index.put_fields_ids_map(self.wtxn, &fields_ids_map)?;
@@ -540,7 +537,7 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
                 }
             }
             Setting::Reset => {
-                if self.index.number_of_documents(&self.wtxn)? == 0 {
+                if self.index.number_of_documents(self.wtxn)? == 0 {
                     self.index.delete_primary_key(self.wtxn)?;
                     Ok(())
                 } else {
@@ -574,24 +571,24 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
                 if one > two {
                     return Err(UserError::InvalidMinTypoWordLenSetting(one, two).into());
                 } else {
-                    self.index.put_min_word_len_one_typo(&mut self.wtxn, one)?;
+                    self.index.put_min_word_len_one_typo(self.wtxn, one)?;
-                    self.index.put_min_word_len_two_typos(&mut self.wtxn, two)?;
+                    self.index.put_min_word_len_two_typos(self.wtxn, two)?;
                 }
             }
             (Setting::Set(one), _) => {
-                let two = self.index.min_word_len_two_typos(&self.wtxn)?;
+                let two = self.index.min_word_len_two_typos(self.wtxn)?;
                 if one > two {
                     return Err(UserError::InvalidMinTypoWordLenSetting(one, two).into());
                 } else {
-                    self.index.put_min_word_len_one_typo(&mut self.wtxn, one)?;
+                    self.index.put_min_word_len_one_typo(self.wtxn, one)?;
                 }
             }
             (_, Setting::Set(two)) => {
-                let one = self.index.min_word_len_one_typo(&self.wtxn)?;
+                let one = self.index.min_word_len_one_typo(self.wtxn)?;
                 if one > two {
                     return Err(UserError::InvalidMinTypoWordLenSetting(one, two).into());
                 } else {
-                    self.index.put_min_word_len_two_typos(&mut self.wtxn, two)?;
+                    self.index.put_min_word_len_two_typos(self.wtxn, two)?;
                 }
             }
             _ => (),
@@ -621,10 +618,10 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
                 words.sort_unstable();
 
                 let words = fst::Set::from_iter(words.iter())?;
-                self.index.put_exact_words(&mut self.wtxn, &words)?;
+                self.index.put_exact_words(self.wtxn, &words)?;
             }
             Setting::Reset => {
-                self.index.put_exact_words(&mut self.wtxn, &fst::Set::default())?;
+                self.index.put_exact_words(self.wtxn, &fst::Set::default())?;
             }
             Setting::NotSet => (),
         }
@@ -635,10 +632,10 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
     fn update_max_values_per_facet(&mut self) -> Result<()> {
         match self.max_values_per_facet {
             Setting::Set(max) => {
-                self.index.put_max_values_per_facet(&mut self.wtxn, max)?;
+                self.index.put_max_values_per_facet(self.wtxn, max)?;
             }
             Setting::Reset => {
-                self.index.delete_max_values_per_facet(&mut self.wtxn)?;
+                self.index.delete_max_values_per_facet(self.wtxn)?;
             }
             Setting::NotSet => (),
         }
@@ -649,10 +646,10 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
     fn update_pagination_max_total_hits(&mut self) -> Result<()> {
         match self.pagination_max_total_hits {
             Setting::Set(max) => {
-                self.index.put_pagination_max_total_hits(&mut self.wtxn, max)?;
+                self.index.put_pagination_max_total_hits(self.wtxn, max)?;
             }
             Setting::Reset => {
-                self.index.delete_pagination_max_total_hits(&mut self.wtxn)?;
+                self.index.delete_pagination_max_total_hits(self.wtxn)?;
             }
             Setting::NotSet => (),
         }
@@ -666,8 +663,8 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
     {
         self.index.set_updated_at(self.wtxn, &OffsetDateTime::now_utc())?;
 
-        let old_faceted_fields = self.index.user_defined_faceted_fields(&self.wtxn)?;
+        let old_faceted_fields = self.index.user_defined_faceted_fields(self.wtxn)?;
-        let old_fields_ids_map = self.index.fields_ids_map(&self.wtxn)?;
+        let old_fields_ids_map = self.index.fields_ids_map(self.wtxn)?;
 
         self.update_displayed()?;
         self.update_filterable()?;
@@ -684,7 +681,7 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
         // If there is new faceted fields we indicate that we must reindex as we must
         // index new fields as facets. It means that the distinct attribute,
         // an Asc/Desc criterion or a filtered attribute as be added or removed.
-        let new_faceted_fields = self.index.user_defined_faceted_fields(&self.wtxn)?;
+        let new_faceted_fields = self.index.user_defined_faceted_fields(self.wtxn)?;
         let faceted_updated = old_faceted_fields != new_faceted_fields;
 
         let stop_words_updated = self.update_stop_words()?;

milli/src/update/word_prefix_docids.rs

@@ -61,12 +61,12 @@ impl<'t, 'u, 'i> WordPrefixDocids<'t, 'u, 'i> {
             let mut prefixes_cache = HashMap::new();
             while let Some((word, data)) = new_word_docids_iter.move_on_next()? {
                 current_prefixes = match current_prefixes.take() {
-                    Some(prefixes) if word.starts_with(&prefixes[0].as_bytes()) => Some(prefixes),
+                    Some(prefixes) if word.starts_with(prefixes[0].as_bytes()) => Some(prefixes),
                     _otherwise => {
                         write_prefixes_in_sorter(&mut prefixes_cache, &mut prefix_docids_sorter)?;
                         common_prefix_fst_words
                             .iter()
-                            .find(|prefixes| word.starts_with(&prefixes[0].as_bytes()))
+                            .find(|prefixes| word.starts_with(prefixes[0].as_bytes()))
                     }
                 };
 

milli/src/update/word_prefix_pair_proximity_docids.rs

@@ -257,7 +257,7 @@ impl<'t, 'u, 'i> WordPrefixPairProximityDocids<'t, 'u, 'i> {
 
     #[logging_timer::time("WordPrefixPairProximityDocids::{}")]
     pub fn execute<'a>(
-        mut self,
+        self,
         new_word_pair_proximity_docids: grenad::Reader<CursorClonableMmap>,
         new_prefix_fst_words: &'a [String],
         common_prefix_fst_words: &[&'a [String]],
@@ -268,9 +268,8 @@ impl<'t, 'u, 'i> WordPrefixPairProximityDocids<'t, 'u, 'i> {
         // Make a prefix trie from the common prefixes that are shorter than self.max_prefix_length
         let prefixes = PrefixTrieNode::from_sorted_prefixes(
             common_prefix_fst_words
-                .into_iter()
+                .iter()
-                .map(|s| s.into_iter())
+                .flat_map(|s| s.iter())
-                .flatten()
                 .map(|s| s.as_str())
                 .filter(|s| s.len() <= self.max_prefix_length),
         );
@@ -298,7 +297,7 @@ impl<'t, 'u, 'i> WordPrefixPairProximityDocids<'t, 'u, 'i> {
                 // and this argument tells what to do with each new key (word1, prefix, proximity) and value (roaring bitmap)
                 |key, value| {
                     insert_into_database(
-                        &mut self.wtxn,
+                        self.wtxn,
                         *self.index.word_prefix_pair_proximity_docids.as_polymorph(),
                         key,
                         value,
@@ -311,7 +310,7 @@ impl<'t, 'u, 'i> WordPrefixPairProximityDocids<'t, 'u, 'i> {
 
         let prefixes = PrefixTrieNode::from_sorted_prefixes(
             new_prefix_fst_words
-                .into_iter()
+                .iter()
                 .map(|s| s.as_str())
                 .filter(|s| s.len() <= self.max_prefix_length),
         );
@@ -445,7 +444,7 @@ fn execute_on_word_pairs_and_prefixes<I>(
                     let prefix_len = prefix_buffer.len();
                     prefix_buffer.push(0);
                     prefix_buffer.push(proximity);
-                    batch.insert(&prefix_buffer, data.to_vec());
+                    batch.insert(prefix_buffer, data.to_vec());
                     prefix_buffer.truncate(prefix_len);
                 },
             );
@@ -620,7 +619,7 @@ impl PrefixTrieNode {
     fn set_search_start(&self, word: &[u8], search_start: &mut PrefixTrieNodeSearchStart) -> bool {
         let byte = word[0];
         if self.children[search_start.0].1 == byte {
-            return true;
+            true
         } else {
             match self.children[search_start.0..].binary_search_by_key(&byte, |x| x.1) {
                 Ok(position) => {
@@ -638,7 +637,7 @@ impl PrefixTrieNode {
     fn from_sorted_prefixes<'a>(prefixes: impl Iterator<Item = &'a str>) -> Self {
         let mut node = PrefixTrieNode::default();
         for prefix in prefixes {
-            node.insert_sorted_prefix(prefix.as_bytes().into_iter());
+            node.insert_sorted_prefix(prefix.as_bytes().iter());
         }
         node
     }

milli/src/update/words_prefixes_fst.rs

@@ -42,7 +42,7 @@ impl<'t, 'u, 'i> WordsPrefixesFst<'t, 'u, 'i> {
 
     #[logging_timer::time("WordsPrefixesFst::{}")]
     pub fn execute(self) -> Result<()> {
-        let words_fst = self.index.words_fst(&self.wtxn)?;
+        let words_fst = self.index.words_fst(self.wtxn)?;
 
         let mut current_prefix = vec![SmallString32::new(); self.max_prefix_length];
         let mut current_prefix_count = vec![0; self.max_prefix_length];