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Code Issues Releases Wiki Activity

feat(search): support words_limit

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This commit is contained in:
Alexey Shekhirin 2021-04-13 20:10:58 +03:00
parent 726fcf015a
commit 6fa00c61d2
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GPG Key ID: AF9A26AA133B5B98
2 changed files with 72 additions and 29 deletions
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35
milli/src/search/mod.rs
View File

@ -1,25 +1,27 @@
use std::borrow::Cow;
use std::collections::hash_map::{HashMap, Entry};
use std::collections::hash_map::{Entry, HashMap};
use std::fmt;
use std::mem::take;
use std::str::Utf8Error;
use std::time::Instant;
use fst::{IntoStreamer, Streamer};
use levenshtein_automata::{DFA, LevenshteinAutomatonBuilder as LevBuilder};
use levenshtein_automata::{LevenshteinAutomatonBuilder as LevBuilder, DFA};
use log::debug;
use meilisearch_tokenizer::{AnalyzerConfig, Analyzer};
use meilisearch_tokenizer::{Analyzer, AnalyzerConfig};
use once_cell::sync::Lazy;
use roaring::bitmap::RoaringBitmap;
use crate::search::criteria::fetcher::{FetcherResult, Fetcher};
use crate::{Index, DocumentId};
use distinct::{MapDistinct, FacetDistinct, Distinct, DocIter, NoopDistinct};
use self::query_tree::QueryTreeBuilder;
use distinct::{Distinct, DocIter, FacetDistinct, MapDistinct, NoopDistinct};
pub use self::facet::FacetIter;
pub use self::facet::{FacetCondition, FacetDistribution, FacetNumberOperator, FacetStringOperator};
use crate::search::criteria::fetcher::{Fetcher, FetcherResult};
use crate::{DocumentId, Index};
pub use self::facet::{
FacetCondition, FacetDistribution, FacetIter, FacetNumberOperator, FacetStringOperator,
};
pub use self::query_tree::MatchingWords;
use self::query_tree::QueryTreeBuilder;
// Building these factories is not free.
static LEVDIST0: Lazy<LevBuilder> = Lazy::new(|| LevBuilder::new(0, true));
@ -38,6 +40,7 @@ pub struct Search<'a> {
limit: usize,
optional_words: bool,
authorize_typos: bool,
words_limit: usize,
rtxn: &'a heed::RoTxn<'a>,
index: &'a Index,
}
@ -51,6 +54,7 @@ impl<'a> Search<'a> {
limit: 20,
optional_words: true,
authorize_typos: true,
words_limit: 10,
rtxn,
index,
}
@ -81,6 +85,11 @@ impl<'a> Search<'a> {
self
}
pub fn words_limit(&mut self, value: usize) -> &mut Search<'a> {
self.words_limit = value;
self
}
pub fn facet_condition(&mut self, condition: FacetCondition) -> &mut Search<'a> {
self.facet_condition = Some(condition);
self
@ -94,6 +103,7 @@ impl<'a> Search<'a> {
let mut builder = QueryTreeBuilder::new(self.rtxn, self.index);
builder.optional_words(self.optional_words);
builder.authorize_typos(self.authorize_typos);
builder.words_limit(self.words_limit);
// We make sure that the analyzer is aware of the stop words
// this ensures that the query builder is able to properly remove them.
let mut config = AnalyzerConfig::default();
@ -154,14 +164,12 @@ impl<'a> Search<'a> {
matching_words: MatchingWords,
mut criteria: Fetcher,
) -> anyhow::Result<SearchResult> {
let mut offset = self.offset;
let mut initial_candidates = RoaringBitmap::new();
let mut excluded_documents = RoaringBitmap::new();
let mut documents_ids = Vec::with_capacity(self.limit);
while let Some(FetcherResult { candidates, bucket_candidates, .. }) = criteria.next()? {
debug!("Number of candidates found {}", candidates.len());
let excluded = take(&mut excluded_documents);
@ -195,6 +203,7 @@ impl fmt::Debug for Search<'_> {
limit,
optional_words,
authorize_typos,
words_limit,
rtxn: _,
index: _,
} = self;
@ -205,6 +214,7 @@ impl fmt::Debug for Search<'_> {
.field("limit", limit)
.field("optional_words", optional_words)
.field("authorize_typos", authorize_typos)
.field("words_limit", words_limit)
.finish()
}
}
@ -225,8 +235,7 @@ pub fn word_derivations<'c>(
max_typo: u8,
fst: &fst::Set<Cow<[u8]>>,
cache: &'c mut WordDerivationsCache,
) -> Result<&'c [(String, u8)], Utf8Error>
{
) -> Result<&'c [(String, u8)], Utf8Error> {
match cache.entry((word.to_string(), is_prefix, max_typo)) {
Entry::Occupied(entry) => Ok(entry.into_mut()),
Entry::Vacant(entry) => {

66
milli/src/search/query_tree.rs
View File

@ -170,6 +170,7 @@ pub struct QueryTreeBuilder<'a> {
index: &'a Index,
optional_words: bool,
authorize_typos: bool,
words_limit: Option<usize>,
}
impl<'a> Context for QueryTreeBuilder<'a> {
@ -190,7 +191,7 @@ impl<'a> QueryTreeBuilder<'a> {
/// Create a `QueryTreeBuilder` from a heed ReadOnly transaction `rtxn`
/// and an Index `index`.
pub fn new(rtxn: &'a heed::RoTxn<'a>, index: &'a Index) -> Self {
Self { rtxn, index, optional_words: true, authorize_typos: true }
Self { rtxn, index, optional_words: true, authorize_typos: true, words_limit: None }
}
/// if `optional_words` is set to `false` the query tree will be
@ -213,6 +214,13 @@ impl<'a> QueryTreeBuilder<'a> {
self
}
/// Limit words and phrases that will be taken for query building.
/// Any beyond `words_limit` will be ignored.
pub fn words_limit(&mut self, words_limit: usize) -> &mut Self {
self.words_limit = Some(words_limit);
self
}
/// Build the query tree:
/// - if `optional_words` is set to `false` the query tree will be
/// generated forcing all query words to be present in each matching documents
@ -222,7 +230,7 @@ impl<'a> QueryTreeBuilder<'a> {
/// (the criterion `typo` will be ignored)
pub fn build(&self, query: TokenStream) -> anyhow::Result<Option<Operation>> {
let stop_words = self.index.stop_words(self.rtxn)?;
let primitive_query = create_primitive_query(query, stop_words);
let primitive_query = create_primitive_query(query, stop_words, self.words_limit);
if !primitive_query.is_empty() {
create_query_tree(self, self.optional_words, self.authorize_typos, primitive_query).map(Some)
} else {
@ -476,13 +484,18 @@ impl PrimitiveQueryPart {
/// Create primitive query from tokenized query string,
/// the primitive query is an intermediate state to build the query tree.
fn create_primitive_query(query: TokenStream, stop_words: Option<Set<&[u8]>>) -> PrimitiveQuery {
fn create_primitive_query(query: TokenStream, stop_words: Option<Set<&[u8]>>, words_limit: Option<usize>) -> PrimitiveQuery {
let mut primitive_query = Vec::new();
let mut phrase = Vec::new();
let mut quoted = false;
let parts_limit = words_limit.unwrap_or(usize::MAX);
let mut peekable = query.peekable();
while let Some(token) = peekable.next() {
// early return if word limit is exceeded
if primitive_query.len() >= parts_limit { return primitive_query }
match token.kind {
TokenKind::Word | TokenKind::StopWord => {
// 1. if the word is quoted we push it in a phrase-buffer waiting for the ending quote,
@ -564,10 +577,11 @@ mod test {
&self,
optional_words: bool,
authorize_typos: bool,
words_limit: Option<usize>,
query: TokenStream,
) -> anyhow::Result<Option<Operation>>
{
let primitive_query = create_primitive_query(query, None);
let primitive_query = create_primitive_query(query, None, words_limit);
if !primitive_query.is_empty() {
create_query_tree(self, optional_words, authorize_typos, primitive_query).map(Some)
} else {
@ -660,7 +674,7 @@ mod test {
Operation::Query(Query { prefix: true, kind: QueryKind::tolerant(2, "heyfriends".to_string()) }),
]);
let query_tree = TestContext::default().build(false, true, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(false, true, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -680,7 +694,7 @@ mod test {
Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(2, "heyfriends".to_string()) }),
]);
let query_tree = TestContext::default().build(false, true, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(false, true, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -711,7 +725,7 @@ mod test {
Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(2, "helloworld".to_string()) }),
]);
let query_tree = TestContext::default().build(false, true, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(false, true, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -756,7 +770,7 @@ mod test {
]),
]);
let query_tree = TestContext::default().build(false, true, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(false, true, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -776,7 +790,7 @@ mod test {
Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "ngrams".to_string()) }),
]);
let query_tree = TestContext::default().build(false, true, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(false, true, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -802,7 +816,7 @@ mod test {
Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(2, "wordsplitfish".to_string()) }),
]);
let query_tree = TestContext::default().build(false, true, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(false, true, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -822,7 +836,7 @@ mod test {
Operation::Query(Query { prefix: false, kind: QueryKind::exact("wooop".to_string()) }),
]);
let query_tree = TestContext::default().build(false, true, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(false, true, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -861,7 +875,7 @@ mod test {
Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(2, "heymyfriend".to_string()) }),
]),
]);
let query_tree = TestContext::default().build(true, true, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(true, true, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -877,7 +891,7 @@ mod test {
Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()) }),
Operation::Query(Query { prefix: false, kind: QueryKind::exact("my".to_string()) }),
]);
let query_tree = TestContext::default().build(true, true, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(true, true, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -911,7 +925,7 @@ mod test {
Operation::Query(Query { prefix: false, kind: QueryKind::exact("friend".to_string()) }),
]),
]);
let query_tree = TestContext::default().build(true, true, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(true, true, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -930,7 +944,7 @@ mod test {
]),
Operation::Query(Query { prefix: false, kind: QueryKind::exact("heyfriends".to_string()) }),
]);
let query_tree = TestContext::default().build(false, false, tokens).unwrap().unwrap();
let query_tree = TestContext::default().build(false, false, None, tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
@ -943,7 +957,7 @@ mod test {
let tokens = result.tokens();
let context = TestContext::default();
let query_tree = context.build(false, true, tokens).unwrap().unwrap();
let query_tree = context.build(false, true, None, tokens).unwrap().unwrap();
let expected = hashset!{
("word", 0, false),
@ -967,4 +981,24 @@ mod test {
let words = fetch_queries(&query_tree);
assert_eq!(expected, words);
}
#[test]
fn words_limit() {
let query = "\"hey my\" good friend";
let analyzer = Analyzer::new(AnalyzerConfig::<Vec<u8>>::default());
let result = analyzer.analyze(query);
let tokens = result.tokens();
let expected = Operation::And(vec![
Operation::Consecutive(vec![
Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()) }),
Operation::Query(Query { prefix: false, kind: QueryKind::exact("my".to_string()) }),
]),
Operation::Query(Query { prefix: false, kind: QueryKind::exact("good".to_string()) }),
]);
let query_tree = TestContext::default().build(false, false, Some(2), tokens).unwrap().unwrap();
assert_eq!(expected, query_tree);
}
}