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https://github.com/meilisearch/MeiliSearch
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Speed-up facet aggregation on low number of candidates
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parent
a17bb54d8f
commit
3916c54501
@ -2,11 +2,13 @@ use std::collections::{HashSet, HashMap};
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use std::{cmp, fmt};
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use std::ops::Bound::Unbounded;
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use ordered_float::OrderedFloat;
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use roaring::RoaringBitmap;
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use serde_json::Value;
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use crate::facet::FacetType;
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use crate::heed_codec::facet::{FacetValueStringCodec, FacetLevelValueF64Codec, FacetLevelValueI64Codec};
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use crate::heed_codec::facet::{FieldDocIdFacetStringCodec, FieldDocIdFacetF64Codec, FieldDocIdFacetI64Codec};
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use crate::search::facet::FacetRange;
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use crate::{Index, FieldId};
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@ -38,47 +40,98 @@ impl<'a> FacetDistribution<'a> {
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self
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}
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fn facet_values(&self, field_id: FieldId, field_type: FacetType) -> heed::Result<Vec<Value>> {
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let db = self.index.facet_field_id_value_docids;
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let iter = match field_type {
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FacetType::String => {
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let iter = db
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.prefix_iter(&self.rtxn, &[field_id])?
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.remap_key_type::<FacetValueStringCodec>()
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.map(|r| r.map(|((_, v), docids)| (Value::from(v), docids)));
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Box::new(iter) as Box::<dyn Iterator<Item=_>>
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},
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FacetType::Integer => {
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let db = db.remap_key_type::<FacetLevelValueI64Codec>();
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let range = FacetRange::<i64, _>::new(
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self.rtxn, db, field_id, 0, Unbounded, Unbounded,
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)?;
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Box::new(range.map(|r| r.map(|((_, _, v, _), docids)| (Value::from(v), docids))))
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},
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FacetType::Float => {
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let db = db.remap_key_type::<FacetLevelValueF64Codec>();
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let range = FacetRange::<f64, _>::new(
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self.rtxn, db, field_id, 0, Unbounded, Unbounded,
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)?;
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Box::new(range.map(|r| r.map(|((_, _, v, _), docids)| (Value::from(v), docids))))
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},
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};
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let mut facet_values = Vec::new();
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for result in iter {
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let (value, docids) = result?;
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match &self.candidates {
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Some(candidates) => if !docids.is_disjoint(candidates) {
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facet_values.push(value);
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fn facet_values(&self, field_id: FieldId, facet_type: FacetType) -> heed::Result<Vec<Value>> {
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if let Some(candidates) = self.candidates.as_ref().filter(|c| c.len() <= 1000) {
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let mut key_buffer = vec![field_id];
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match facet_type {
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FacetType::Float => {
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let mut facet_values = HashSet::new();
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for docid in candidates {
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key_buffer.truncate(1);
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key_buffer.extend_from_slice(&docid.to_be_bytes());
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let iter = self.index.field_id_docid_facet_values
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.prefix_iter(self.rtxn, &key_buffer)?
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.remap_key_type::<FieldDocIdFacetF64Codec>();
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for result in iter {
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let ((_, _, value), ()) = result?;
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facet_values.insert(OrderedFloat(value));
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}
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}
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Ok(facet_values.into_iter().map(|f| Value::from(*f)).collect())
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},
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FacetType::Integer => {
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let mut facet_values = HashSet::new();
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for docid in candidates {
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key_buffer.truncate(1);
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key_buffer.extend_from_slice(&docid.to_be_bytes());
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let iter = self.index.field_id_docid_facet_values
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.prefix_iter(self.rtxn, &key_buffer)?
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.remap_key_type::<FieldDocIdFacetI64Codec>();
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for result in iter {
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let ((_, _, value), ()) = result?;
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facet_values.insert(value);
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}
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}
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Ok(facet_values.into_iter().map(Value::from).collect())
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},
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FacetType::String => {
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let mut facet_values = HashSet::new();
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for docid in candidates {
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key_buffer.truncate(1);
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key_buffer.extend_from_slice(&docid.to_be_bytes());
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let iter = self.index.field_id_docid_facet_values
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.prefix_iter(self.rtxn, &key_buffer)?
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.remap_key_type::<FieldDocIdFacetStringCodec>();
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for result in iter {
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let ((_, _, value), ()) = result?;
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facet_values.insert(value);
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}
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}
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Ok(facet_values.into_iter().map(Value::from).collect())
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},
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None => facet_values.push(value),
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}
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if facet_values.len() == self.max_values_by_facet {
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break;
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}
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}
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} else {
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let db = self.index.facet_field_id_value_docids;
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let iter = match facet_type {
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FacetType::String => {
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let iter = db
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.prefix_iter(&self.rtxn, &[field_id])?
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.remap_key_type::<FacetValueStringCodec>()
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.map(|r| r.map(|((_, v), docids)| (Value::from(v), docids)));
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Box::new(iter) as Box::<dyn Iterator<Item=_>>
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},
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FacetType::Integer => {
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let db = db.remap_key_type::<FacetLevelValueI64Codec>();
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let range = FacetRange::<i64, _>::new(
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self.rtxn, db, field_id, 0, Unbounded, Unbounded,
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)?;
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Box::new(range.map(|r| r.map(|((_, _, v, _), docids)| (Value::from(v), docids))))
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},
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FacetType::Float => {
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let db = db.remap_key_type::<FacetLevelValueF64Codec>();
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let range = FacetRange::<f64, _>::new(
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self.rtxn, db, field_id, 0, Unbounded, Unbounded,
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)?;
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Box::new(range.map(|r| r.map(|((_, _, v, _), docids)| (Value::from(v), docids))))
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},
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};
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Ok(facet_values)
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let mut facet_values = Vec::new();
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for result in iter {
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let (value, docids) = result?;
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match &self.candidates {
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Some(candidates) => if !docids.is_disjoint(candidates) {
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facet_values.push(value);
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},
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None => facet_values.push(value),
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}
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if facet_values.len() == self.max_values_by_facet {
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break;
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}
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}
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Ok(facet_values)
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}
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}
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pub fn execute(&self) -> heed::Result<HashMap<String, Vec<Value>>> {
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