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Reduce the universe while exploring the facet tree

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This commit is contained in:
Clément Renault
2024-06-05 21:30:04 -04:00
parent 66470b27e6
commit 5432776132
1 changed files with 39 additions and 20 deletions
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59
milli/src/search/facet/facet_range_search.rs
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@@ -50,7 +50,7 @@ where
Bound::Unbounded => Bound::Unbounded,
};
let db = db.remap_types::<FacetGroupKeyCodec<BytesRefCodec>, FacetGroupLazyValueCodec>();
let mut f = FacetRangeSearch { rtxn, db, field_id, left, right, universe, docids };
let mut f = FacetRangeSearch { rtxn, db, field_id, left, right, docids };
let highest_level = get_highest_level(rtxn, db, field_id)?;
if let Some(starting_left_bound) =
@@ -59,7 +59,7 @@ where
let rightmost_bound =
Bound::Included(get_last_facet_value::<BytesRefCodec, _>(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)?;
f.run(highest_level, starting_left_bound, rightmost_bound, group_size, universe)?;
Ok(())
} else {
Ok(())
@@ -73,14 +73,18 @@ struct FacetRangeSearch<'t, 'b, 'bitmap> {
field_id: u16,
left: Bound<&'b [u8]>,
right: Bound<&'b [u8]>,
/// The subset of documents ids that are useful for this search.
/// Great performance optimizations can be achieved by only fetching values matching this subset.
universe: Option<&'bitmap RoaringBitmap>,
docids: &'bitmap mut RoaringBitmap,
}
impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
fn run_level_0(&mut self, starting_left_bound: &'t [u8], group_size: usize) -> Result<()> {
fn run_level_0(
&mut self,
starting_left_bound: &'t [u8],
group_size: usize,
// The subset of documents ids that are useful for this search.
// Great performance optimizations can be achieved by only fetching values matching this subset.
universe: Option<&RoaringBitmap>,
) -> Result<()> {
let left_key =
FacetGroupKey { field_id: self.field_id, level: 0, left_bound: starting_left_bound };
let iter = self.db.range(self.rtxn, &(left_key..))?.take(group_size);
@@ -113,7 +117,7 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
}
if RangeBounds::<&[u8]>::contains(&(self.left, self.right), &key.left_bound) {
*self.docids |= match self.universe {
*self.docids |= match universe {
Some(universe) => CboRoaringBitmapCodec::intersection_with_serialized(
value.bitmap_bytes,
universe,
@@ -150,9 +154,10 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
starting_left_bound: &'t [u8],
rightmost_bound: Bound<&'t [u8]>,
group_size: usize,
universe: Option<&RoaringBitmap>,
) -> Result<()> {
if level == 0 {
return self.run_level_0(starting_left_bound, group_size);
return self.run_level_0(starting_left_bound, group_size, universe);
}
let left_key =
@@ -209,12 +214,16 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
};
left_condition && right_condition
};
let subset = match universe {
Some(universe) => Some(CboRoaringBitmapCodec::intersection_with_serialized(
previous_value.bitmap_bytes,
universe,
)?),
None => None,
};
if should_take_whole_group {
*self.docids |= match self.universe {
Some(universe) => CboRoaringBitmapCodec::intersection_with_serialized(
previous_value.bitmap_bytes,
universe,
)?,
*self.docids |= match subset {
Some(subset) => subset,
None => CboRoaringBitmapCodec::deserialize_from(previous_value.bitmap_bytes)?,
};
previous_key = next_key;
@@ -229,7 +238,9 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
let rightmost_bound = Bound::Excluded(next_key.left_bound);
let group_size = previous_value.size as usize;
self.run(level, starting_left_bound, rightmost_bound, group_size)?;
if subset.as_ref().map_or(true, |u| !u.is_empty()) {
self.run(level, starting_left_bound, rightmost_bound, group_size, subset.as_ref())?;
}
previous_key = next_key;
previous_value = next_value;
@@ -311,12 +322,18 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
};
left_condition && right_condition
};
let subset = match universe {
Some(universe) => Some(CboRoaringBitmapCodec::intersection_with_serialized(
previous_value.bitmap_bytes,
universe,
)?),
None => None,
};
if should_take_whole_group {
*self.docids |= match self.universe {
Some(universe) => CboRoaringBitmapCodec::intersection_with_serialized(
previous_value.bitmap_bytes,
universe,
)?,
*self.docids |= match subset {
Some(subset) => subset,
None => CboRoaringBitmapCodec::deserialize_from(previous_value.bitmap_bytes)?,
};
} else {
@@ -324,7 +341,9 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
let starting_left_bound = previous_key.left_bound;
let group_size = previous_value.size as usize;
self.run(level, starting_left_bound, rightmost_bound, group_size)?;
if subset.as_ref().map_or(true, |u| !u.is_empty()) {
self.run(level, starting_left_bound, rightmost_bound, group_size, subset.as_ref())?;
}
}
Ok(())