searchengines-web/MeiliSearch
searchengines-web/MeiliSearch
1
0
Fork 0
mirror of https://github.com/meilisearch/MeiliSearch synced 2024-06-13 08:09:50 +02:00
Code Issues Releases Wiki Activity

Fix a bug in facet_range_search and add documentation

Browse Source
This commit is contained in:
Loïc Lecrenier 2022-09-21 14:39:11 +02:00 committed by Loïc Lecrenier
parent a2270b7432
commit d0109627b9
14 changed files with 173 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

122
milli/src/search/facet/facet_range_search.rs
View File

@ -9,6 +9,8 @@ use crate::heed_codec::facet::{
};
use crate::Result;
/// Find all the document ids for which the given field contains a value contained within
/// the two bounds.
pub fn find_docids_of_facet_within_bounds<'t, BoundCodec>(
rtxn: &'t heed::RoTxn<'t>,
db: heed::Database<FacetGroupKeyCodec<BoundCodec>, FacetGroupValueCodec>,
@ -24,11 +26,11 @@ where
let inner;
let left = match left {
Bound::Included(left) => {
inner = BoundCodec::bytes_encode(left).unwrap();
inner = BoundCodec::bytes_encode(left).ok_or(heed::Error::Encoding)?;
Bound::Included(inner.as_ref())
}
Bound::Excluded(left) => {
inner = BoundCodec::bytes_encode(left).unwrap();
inner = BoundCodec::bytes_encode(left).ok_or(heed::Error::Encoding)?;
Bound::Excluded(inner.as_ref())
}
Bound::Unbounded => Bound::Unbounded,
@ -36,11 +38,11 @@ where
let inner;
let right = match right {
Bound::Included(right) => {
inner = BoundCodec::bytes_encode(right).unwrap();
inner = BoundCodec::bytes_encode(right).ok_or(heed::Error::Encoding)?;
Bound::Included(inner.as_ref())
}
Bound::Excluded(right) => {
inner = BoundCodec::bytes_encode(right).unwrap();
inner = BoundCodec::bytes_encode(right).ok_or(heed::Error::Encoding)?;
Bound::Excluded(inner.as_ref())
}
Bound::Unbounded => Bound::Unbounded,
@ -49,9 +51,11 @@ where
let mut f = FacetRangeSearch { rtxn, db, field_id, left, right, docids };
let highest_level = get_highest_level(rtxn, db, field_id)?;
if let Some(first_bound) = get_first_facet_value::<ByteSliceRef>(rtxn, db, field_id)? {
let last_bound = get_last_facet_value::<ByteSliceRef>(rtxn, db, field_id)?.unwrap();
f.run(highest_level, first_bound, Bound::Included(last_bound), usize::MAX)?;
if let Some(starting_left_bound) = get_first_facet_value::<ByteSliceRef>(rtxn, db, field_id)? {
let rightmost_bound =
Bound::Included(get_last_facet_value::<ByteSliceRef>(rtxn, db, field_id)?.unwrap()); // will not fail because get_first_facet_value succeeded
let group_size = usize::MAX;
f.run(highest_level, starting_left_bound, rightmost_bound, group_size)?;
Ok(())
} else {
return Ok(());
@ -107,7 +111,25 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
Ok(())
}
/// Recursive part of the algorithm for level > 0
/// Recursive part of the algorithm for level > 0.
///
/// It works by visiting a slice of a level and checking whether the range asscociated
/// with each visited element is contained within the bounds.
///
/// 1. So long as the element's range is less than the left bound, we do nothing and keep iterating
/// 2. If the element's range is fully contained by the bounds, then all of its docids are added to
/// the roaring bitmap.
/// 3. If the element's range merely intersects the bounds, then we call the algorithm recursively
/// on the children of the element from the level below.
/// 4. If the element's range is greater than the right bound, we do nothing and stop iterating.
/// Note that the right bound is found through either the `left_bound` of the *next* element,
/// or from the `rightmost_bound` argument
///
/// ## Arguments
/// - `level`: the level being visited
/// - `starting_left_bound`: the left_bound of the first element to visit
/// - `rightmost_bound`: the right bound of the last element that should be visited
/// - `group_size`: the number of elements that should be visited
fn run(
&mut self,
level: u8,
@ -123,13 +145,14 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
FacetGroupKey { field_id: self.field_id, level, left_bound: starting_left_bound };
let mut iter = self.db.range(&self.rtxn, &(left_key..))?.take(group_size);
// We iterate over the range while keeping in memory the previous value
let (mut previous_key, mut previous_value) = iter.next().unwrap()?;
for el in iter {
let (next_key, next_value) = el?;
// the right of the iter range is unbounded, so we need to make sure that we are not iterating
// on the next field id
// the right of the iter range is potentially unbounded (e.g. if `group_size` is usize::MAX),
// so we need to make sure that we are not iterating on the next field id
if next_key.field_id != self.field_id {
return Ok(());
break;
}
// now, do we skip, stop, or visit?
let should_skip = {
@ -176,6 +199,8 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
previous_value = next_value;
continue;
}
// from here, we should visit the children of the previous element and
// call the function recursively
let level = level - 1;
let starting_left_bound = previous_key.left_bound;
@ -187,7 +212,7 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
previous_key = next_key;
previous_value = next_value;
}
// previous_key/previous_value are the last element
// previous_key/previous_value are the last element's key/value
// now, do we skip, stop, or visit?
let should_skip = {
@ -224,18 +249,41 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
Bound::Unbounded => true,
};
let right_condition = match (self.right, rightmost_bound) {
(Bound::Included(right), Bound::Included(rightmost)) => rightmost <= right,
(Bound::Included(right), Bound::Excluded(rightmost)) => rightmost < right,
// e.g. x < 8 and rightmost is <= y
// condition met if rightmost < 8
(Bound::Excluded(right), Bound::Included(rightmost)) => rightmost < right,
// e.g. x < 8 and rightmost is < y
// condition met only if y <= 8?
(Bound::Excluded(right), Bound::Excluded(rightmost)) => rightmost <= right,
// e.g. x < inf. , so yes we take the whole thing
(Bound::Unbounded, _) => true,
// e.g. x < 7 , righmost is inf
(_, Bound::Unbounded) => false, // panic?
(Bound::Included(right), Bound::Included(rightmost)) => {
// we need to stay within the bound ..=right
// the element's range goes to ..=righmost
// so the element fits entirely within the bound if rightmost <= right
rightmost <= right
}
(Bound::Included(right), Bound::Excluded(rightmost)) => {
// we need to stay within the bound ..=right
// the element's range goes to ..righmost
// so the element fits entirely within the bound if rightmost <= right
rightmost <= right
}
(Bound::Excluded(right), Bound::Included(rightmost)) => {
// we need to stay within the bound ..right
// the element's range goes to ..=righmost
// so the element fits entirely within the bound if rightmost < right
rightmost < right
}
(Bound::Excluded(right), Bound::Excluded(rightmost)) => {
// we need to stay within the bound ..right
// the element's range goes to ..righmost
// so the element fits entirely within the bound if rightmost <= right
rightmost <= right
}
(Bound::Unbounded, _) => {
// we need to stay within the bound ..inf
// so the element always fits entirely within the bound
true
}
(_, Bound::Unbounded) => {
// we need to stay within a finite bound
// but the element's range goes to ..inf
// so the element never fits entirely within the bound
false
}
};
left_condition && right_condition
};
@ -262,7 +310,10 @@ mod tests {
use super::find_docids_of_facet_within_bounds;
use crate::heed_codec::facet::{FacetGroupKeyCodec, OrderedF64Codec};
use crate::milli_snap;
use crate::search::facet::tests::{get_random_looking_index, get_simple_index};
use crate::search::facet::tests::{
get_random_looking_index, get_random_looking_index_with_multiple_field_ids,
get_simple_index, get_simple_index_with_multiple_field_ids,
};
use crate::snapshot_tests::display_bitmap;
#[test]
@ -272,7 +323,12 @@ mod tests {
}
#[test]
fn filter_range_increasing() {
let indexes = [get_simple_index(), get_random_looking_index()];
let indexes = [
get_simple_index(),
get_random_looking_index(),
get_simple_index_with_multiple_field_ids(),
get_random_looking_index_with_multiple_field_ids(),
];
for (i, index) in indexes.iter().enumerate() {
let txn = index.env.read_txn().unwrap();
let mut results = String::new();
@ -316,7 +372,12 @@ mod tests {
}
#[test]
fn filter_range_decreasing() {
let indexes = [get_simple_index(), get_random_looking_index()];
let indexes = [
get_simple_index(),
get_random_looking_index(),
get_simple_index_with_multiple_field_ids(),
get_random_looking_index_with_multiple_field_ids(),
];
for (i, index) in indexes.iter().enumerate() {
let txn = index.env.read_txn().unwrap();
@ -367,7 +428,12 @@ mod tests {
}
#[test]
fn filter_range_pinch() {
let indexes = [get_simple_index(), get_random_looking_index()];
let indexes = [
get_simple_index(),
get_random_looking_index(),
get_simple_index_with_multiple_field_ids(),
get_random_looking_index_with_multiple_field_ids(),
];
for (i, index) in indexes.iter().enumerate() {
let txn = index.env.read_txn().unwrap();

31
milli/src/search/facet/mod.rs
View File

@ -119,4 +119,35 @@ pub(crate) mod tests {
txn.commit().unwrap();
index
}
pub fn get_simple_index_with_multiple_field_ids() -> FacetIndex<OrderedF64Codec> {
let index = FacetIndex::<OrderedF64Codec>::new(4, 8, 5);
let mut txn = index.env.write_txn().unwrap();
for fid in 0..2 {
for i in 0..256u16 {
let mut bitmap = RoaringBitmap::new();
bitmap.insert(i as u32);
index.insert(&mut txn, fid, &(i as f64), &bitmap);
}
}
txn.commit().unwrap();
index
}
pub fn get_random_looking_index_with_multiple_field_ids() -> FacetIndex<OrderedF64Codec> {
let index = FacetIndex::<OrderedF64Codec>::new(4, 8, 5);
let mut txn = index.env.write_txn().unwrap();
let mut rng = rand::rngs::SmallRng::from_seed([0; 32]);
let keys =
std::iter::from_fn(|| Some(rng.gen_range(0..256))).take(128).collect::<Vec<u32>>();
for fid in 0..2 {
for (_i, &key) in keys.iter().enumerate() {
let mut bitmap = RoaringBitmap::new();
bitmap.insert(key);
bitmap.insert(key + 100);
index.insert(&mut txn, fid, &(key as f64), &bitmap);
}
}
txn.commit().unwrap();
index
}
}

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_decreasing/excluded_2.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
fcedc563a82c1c61f50174a5f3f982b6

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_decreasing/excluded_3.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
6cc26e77fc6bd9145deedf14cf422b03

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_decreasing/included_2.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
57d35cfa419a19a1a1f8d7c8ef096e0f

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_decreasing/included_3.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
3dbe0547b42759795e9b16989df72cee

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_increasing/excluded_2.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
c1c7a0bb91d53d33724583b6d4a99f16

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_increasing/excluded_3.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
12213d3f1047a0c3d08e4670a7d688e7

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_increasing/included_2.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
ca59f20e043a4d52c49e15b10adf96bb

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_increasing/included_3.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
cb69e0fe10fb299bafe77514204379cb

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_pinch/excluded_2.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
3456db9a1bb94c33c1e9f656184ee711

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_pinch/excluded_3.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
2127cd818b457e0611e0c8e1a871602a

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_pinch/included_2.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
b976551ceff412bfb2ec9bfbda320bbb

4
milli/src/search/facet/snapshots/facet_range_search.rs/filter_range_pinch/included_3.hash.snap Normal file
View File

@ -0,0 +1,4 @@
---
source: milli/src/search/facet/facet_range_search.rs
---
7620ca1a96882c7147d3fd996570f9b3