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https://github.com/meilisearch/meilisearch.git
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Improve the facet search algorithm performances
This commit is contained in:
Kerollmops
Clément Renault
parent
67d4a1b3fc
commit
7d67c9e2e7
163
src/search.rs
163
src/search.rs
@ -1,6 +1,7 @@
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use std::borrow::Cow;
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use std::collections::{HashMap, HashSet};
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use std::fmt;
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use std::ops::Bound::{self, Unbounded, Included, Excluded};
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use anyhow::{bail, ensure, Context};
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use fst::{IntoStreamer, Streamer};
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@ -12,7 +13,7 @@ use once_cell::sync::Lazy;
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use roaring::bitmap::RoaringBitmap;
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use crate::facet::FacetType;
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use crate::heed_codec::{facet::FacetLevelValueI64Codec, CboRoaringBitmapCodec};
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use crate::heed_codec::facet::FacetLevelValueI64Codec;
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use crate::mdfs::Mdfs;
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use crate::query_tokens::{QueryTokens, QueryToken};
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use crate::{Index, DocumentId};
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@ -226,6 +227,95 @@ impl<'a> Search<'a> {
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candidates
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}
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/// Aggregates the documents ids that are part of the specified range automatically
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/// going deeper through the levels.
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fn explore_facet_levels(
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&self,
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field_id: u8,
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level: u8,
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left: Bound<i64>,
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right: Bound<i64>,
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output: &mut RoaringBitmap,
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) -> anyhow::Result<()>
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{
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match (left, right) {
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// If the request is an exact value we must go directly to the deepest level.
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(Included(l), Included(r)) if l == r && level > 0 => {
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return self.explore_facet_levels(field_id, 0, left, right, output);
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},
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// lower TO upper when lower > upper must return no result
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(Included(l), Included(r)) if l > r => return Ok(()),
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(Included(l), Excluded(r)) if l >= r => return Ok(()),
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(Excluded(l), Excluded(r)) if l >= r => return Ok(()),
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(Excluded(l), Included(r)) if l >= r => return Ok(()),
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(_, _) => (),
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}
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let mut left_found = None;
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let mut right_found = None;
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// We must create a custom iterator to be able to iterate over the
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// requested range as the range iterator cannot express some conditions.
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let left_bound = match left {
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Included(left) => Included((field_id, level, left, i64::MIN)),
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Excluded(left) => Excluded((field_id, level, left, i64::MIN)),
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Unbounded => Unbounded,
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};
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let right_bound = Included((field_id, level, i64::MAX, i64::MAX));
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let db = self.index.facet_field_id_value_docids.remap_key_type::<FacetLevelValueI64Codec>();
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let iter = db
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.range(self.rtxn, &(left_bound, right_bound))?
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.take_while(|r| r.as_ref().map_or(true, |((.., r), _)| {
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match right {
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Included(right) => *r <= right,
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Excluded(right) => *r < right,
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Unbounded => true,
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}
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}));
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debug!("Iterating between {:?} and {:?} (level {})", left, right, level);
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for (i, result) in iter.enumerate() {
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let ((_fid, _level, l, r), docids) = result?;
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debug!("{} to {} (level {}) found {} documents", l, r, _level, docids.len());
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output.union_with(&docids);
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// We save the leftest and rightest bounds we actually found at this level.
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if i == 0 { left_found = Some(l); }
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right_found = Some(r);
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}
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// Can we go deeper?
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let deeper_level = match level.checked_sub(1) {
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Some(level) => level,
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None => return Ok(()),
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};
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// We must refine the left and right bounds of this range by retrieving the
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// missing part in a deeper level.
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match left_found.zip(right_found) {
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Some((left_found, right_found)) => {
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// If the bound is satisfied we avoid calling this function again.
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if !matches!(left, Included(l) if l == left_found) {
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let sub_right = Excluded(left_found);
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debug!("calling left with {:?} to {:?} (level {})", left, sub_right, deeper_level);
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self.explore_facet_levels(field_id, deeper_level, left, sub_right, output)?;
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}
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if !matches!(right, Included(r) if r == right_found) {
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let sub_left = Excluded(right_found);
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debug!("calling right with {:?} to {:?} (level {})", sub_left, right, deeper_level);
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self.explore_facet_levels(field_id, deeper_level, sub_left, right, output)?;
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}
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},
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None => {
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// If we found nothing at this level it means that we must find
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// the same bounds but at a deeper, more precise level.
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self.explore_facet_levels(field_id, deeper_level, left, right, output)?;
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},
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}
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Ok(())
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}
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pub fn execute(&self) -> anyhow::Result<SearchResult> {
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let limit = self.limit;
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let fst = self.index.words_fst(self.rtxn)?;
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@ -239,64 +329,11 @@ impl<'a> Search<'a> {
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// We create the original candidates with the facet conditions results.
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let facet_candidates = match self.facet_condition {
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Some(FacetCondition::Operator(fid, operator)) => {
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use std::ops::Bound::{self, Included, Excluded};
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use FacetOperator::*;
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fn explore_facet_levels(
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rtxn: &heed::RoTxn,
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db: &heed::Database<FacetLevelValueI64Codec, CboRoaringBitmapCodec>,
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field_id: u8,
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level: u8,
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left: Bound<i64>,
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right: Bound<i64>,
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candidates: &mut RoaringBitmap,
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) -> anyhow::Result<()>
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{
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let mut left_found = left;
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let mut right_found = right;
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let range = {
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let left = match left {
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Included(left) => Included((field_id, level, left, i64::MIN)),
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Excluded(left) => Excluded((field_id, level, left, i64::MIN)),
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Bound::Unbounded => Bound::Unbounded,
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};
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let right = Included((field_id, level, i64::MAX, i64::MAX));
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(left, right)
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};
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for (i, result) in db.range(rtxn, &range)?.enumerate() {
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let ((_fid, _level, l, r), docids) = result?;
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match right {
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Included(right) if r > right => break,
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Excluded(right) if r >= right => break,
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_ => (),
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}
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eprintln!("{} to {} (level {})", l, r, _level);
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candidates.union_with(&docids);
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// We save the leftest and rightest bounds we actually found at this level.
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if i == 0 { left_found = Excluded(l); }
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right_found = Excluded(r);
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}
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// Can we go deeper?
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let deeper_level = match level.checked_sub(1) {
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Some(level) => level,
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None => return Ok(()),
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};
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// We must refine the left and right bounds of this range by retrieving the
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// missing part in a deeper level.
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// TODO we must avoid going at deeper when the bounds are already satisfied.
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explore_facet_levels(rtxn, db, field_id, deeper_level, left, left_found, candidates)?;
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explore_facet_levels(rtxn, db, field_id, deeper_level, right_found, right, candidates)?;
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Ok(())
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}
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// Make sure we always bound the ranges with the field id, as the facets
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// values are all in the same database and prefixed by the field id.
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// Make sure we always bound the ranges with the field id and the level,
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// as the facets values are all in the same database and prefixed by the
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// field id and the level.
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let (left, right) = match operator {
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GreaterThan(val) => (Excluded(val), Included(i64::MAX)),
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GreaterThanOrEqual(val) => (Included(val), Included(i64::MAX)),
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@ -316,7 +353,7 @@ impl<'a> Search<'a> {
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// the first entry of it which corresponds to the last key of our field id.
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let db = db.remap_data_type::<DecodeIgnore>();
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match db.get_lower_than(self.rtxn, &(next_fid, 0, i64::MIN, i64::MIN))? {
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Some(((id, level, _left, _right), _docids)) if fid == id => Some(level),
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Some(((id, level, ..), _)) if fid == id => Some(level),
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_ => None,
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}
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},
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@ -324,7 +361,7 @@ impl<'a> Search<'a> {
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// If we can't generate a bigger field id, it must be equal to 255 and
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// therefore the last key of the database must be the one we want.
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match db.remap_data_type::<DecodeIgnore>().last(self.rtxn)? {
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Some(((id, level, _left, _right), _docids)) if fid == id => Some(level),
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Some(((id, level, ..), _)) if fid == id => Some(level),
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_ => None,
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}
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},
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@ -332,9 +369,9 @@ impl<'a> Search<'a> {
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match biggest_level {
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Some(level) => {
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let mut candidates = RoaringBitmap::new();
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explore_facet_levels(self.rtxn, &db, fid, level, left, right, &mut candidates)?;
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Some(candidates)
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let mut output = RoaringBitmap::new();
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self.explore_facet_levels(fid, level, left, right, &mut output)?;
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Some(output)
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},
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None => None,
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}
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@ -342,6 +379,8 @@ impl<'a> Search<'a> {
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None => None,
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};
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debug!("facet candidates: {:?}", facet_candidates);
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let (candidates, derived_words) = match (facet_candidates, derived_words) {
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(Some(mut facet_candidates), Some(derived_words)) => {
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let words_candidates = Self::compute_candidates(&derived_words);
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