Merge #5220

5220: Merge back changes of v1.12.2 in main r=dureuill a=dureuill



Co-authored-by: curquiza <curquiza@users.noreply.github.com>
Co-authored-by: Tamo <tamo@meilisearch.com>
Co-authored-by: dureuill <dureuill@users.noreply.github.com>
Co-authored-by: Louis Dureuil <louis@meilisearch.com>

crates/milli/src/update/facet/mod.rs

@@ -79,22 +79,29 @@ pub const FACET_MIN_LEVEL_SIZE: u8 = 5;
 use std::collections::BTreeSet;
 use std::fs::File;
 use std::io::BufReader;
+use std::ops::Bound;
 
 use grenad::Merger;
 use heed::types::{Bytes, DecodeIgnore};
+use heed::BytesDecode as _;
+use roaring::RoaringBitmap;
 use time::OffsetDateTime;
 use tracing::debug;
 
 use self::incremental::FacetsUpdateIncremental;
 use super::{FacetsUpdateBulk, MergeDeladdBtreesetString, MergeDeladdCboRoaringBitmaps};
 use crate::facet::FacetType;
-use crate::heed_codec::facet::{FacetGroupKey, FacetGroupKeyCodec, FacetGroupValueCodec};
+use crate::heed_codec::facet::{
+    FacetGroupKey, FacetGroupKeyCodec, FacetGroupValueCodec, OrderedF64Codec,
+};
 use crate::heed_codec::BytesRefCodec;
+use crate::search::facet::get_highest_level;
 use crate::update::del_add::{DelAdd, KvReaderDelAdd};
 use crate::{try_split_array_at, FieldId, Index, Result};
 
 pub mod bulk;
 pub mod incremental;
+pub mod new_incremental;
 
 /// A builder used to add new elements to the `facet_id_string_docids` or `facet_id_f64_docids` databases.
 ///
@@ -597,3 +604,194 @@ mod comparison_bench {
         }
     }
 }
+
+/// Run sanity checks on the specified fid tree
+///
+/// 1. No "orphan" child value, any child value has a parent
+/// 2. Any docid in the child appears in the parent
+/// 3. No docid in the parent is missing from all its children
+/// 4. no group is bigger than max_group_size
+/// 5. Less than 50% of groups are bigger than group_size
+/// 6. group size matches the number of children
+/// 7. max_level is < 255
+pub(crate) fn sanity_checks(
+    index: &Index,
+    rtxn: &heed::RoTxn,
+    field_id: FieldId,
+    facet_type: FacetType,
+    group_size: usize,
+    _min_level_size: usize, // might add a check on level size later
+    max_group_size: usize,
+) -> Result<()> {
+    tracing::info!(%field_id, ?facet_type, "performing sanity checks");
+    let database = match facet_type {
+        FacetType::String => {
+            index.facet_id_string_docids.remap_key_type::<FacetGroupKeyCodec<BytesRefCodec>>()
+        }
+        FacetType::Number => {
+            index.facet_id_f64_docids.remap_key_type::<FacetGroupKeyCodec<BytesRefCodec>>()
+        }
+    };
+
+    let leaf_prefix: FacetGroupKey<&[u8]> = FacetGroupKey { field_id, level: 0, left_bound: &[] };
+
+    let leaf_it = database.prefix_iter(rtxn, &leaf_prefix)?;
+
+    let max_level = get_highest_level(rtxn, database, field_id)?;
+    if max_level == u8::MAX {
+        panic!("max_level == 255");
+    }
+
+    for leaf in leaf_it {
+        let (leaf_facet_value, leaf_docids) = leaf?;
+        let mut current_level = 0;
+
+        let mut current_parent_facet_value: Option<FacetGroupKey<&[u8]>> = None;
+        let mut current_parent_docids: Option<crate::heed_codec::facet::FacetGroupValue> = None;
+        loop {
+            current_level += 1;
+            if current_level >= max_level {
+                break;
+            }
+            let parent_key_right_bound = FacetGroupKey {
+                field_id,
+                level: current_level,
+                left_bound: leaf_facet_value.left_bound,
+            };
+            let (parent_facet_value, parent_docids) = database
+                .get_lower_than_or_equal_to(rtxn, &parent_key_right_bound)?
+                .expect("no parent found");
+            if parent_facet_value.level != current_level {
+                panic!(
+                    "wrong parent level, found_level={}, expected_level={}",
+                    parent_facet_value.level, current_level
+                );
+            }
+            if parent_facet_value.field_id != field_id {
+                panic!("wrong parent fid");
+            }
+            if parent_facet_value.left_bound > leaf_facet_value.left_bound {
+                panic!("wrong parent left bound");
+            }
+
+            if !leaf_docids.bitmap.is_subset(&parent_docids.bitmap) {
+                panic!(
+                    "missing docids from leaf in parent, current_level={}, parent={}, child={}, missing={missing:?}, child_len={}, child={:?}",
+                    current_level,
+                    facet_to_string(parent_facet_value.left_bound, facet_type),
+                    facet_to_string(leaf_facet_value.left_bound, facet_type),
+                    leaf_docids.bitmap.len(),
+                    leaf_docids.bitmap.clone(),
+                    missing=leaf_docids.bitmap - parent_docids.bitmap,
+                )
+            }
+
+            if let Some(current_parent_facet_value) = current_parent_facet_value {
+                if current_parent_facet_value.field_id != parent_facet_value.field_id {
+                    panic!("wrong parent parent fid");
+                }
+                if current_parent_facet_value.level + 1 != parent_facet_value.level {
+                    panic!("wrong parent parent level");
+                }
+                if current_parent_facet_value.left_bound < parent_facet_value.left_bound {
+                    panic!("wrong parent parent left bound");
+                }
+            }
+
+            if let Some(current_parent_docids) = current_parent_docids {
+                if !current_parent_docids.bitmap.is_subset(&parent_docids.bitmap) {
+                    panic!("missing docids from intermediate node in parent, parent_level={}, parent={}, intermediate={}, missing={missing:?}, intermediate={:?}",
+                    parent_facet_value.level,
+                    facet_to_string(parent_facet_value.left_bound, facet_type),
+                    facet_to_string(current_parent_facet_value.unwrap().left_bound, facet_type),
+                    current_parent_docids.bitmap.clone(),
+                    missing=current_parent_docids.bitmap - parent_docids.bitmap,
+                    );
+                }
+            }
+
+            current_parent_facet_value = Some(parent_facet_value);
+            current_parent_docids = Some(parent_docids);
+        }
+    }
+    tracing::info!(%field_id, ?facet_type, "checked all leaves");
+
+    let mut current_level = max_level;
+    let mut greater_than_group = 0usize;
+    let mut total = 0usize;
+    loop {
+        if current_level == 0 {
+            break;
+        }
+        let child_level = current_level - 1;
+        tracing::info!(%field_id, ?facet_type, %current_level, "checked groups for level");
+        let level_groups_prefix: FacetGroupKey<&[u8]> =
+            FacetGroupKey { field_id, level: current_level, left_bound: &[] };
+        let mut level_groups_it = database.prefix_iter(rtxn, &level_groups_prefix)?.peekable();
+
+        'group_it: loop {
+            let Some(group) = level_groups_it.next() else { break 'group_it };
+
+            let (group_facet_value, group_docids) = group?;
+            let child_left_bound = group_facet_value.left_bound.to_owned();
+            let mut expected_docids = RoaringBitmap::new();
+            let mut expected_size = 0usize;
+            let right_bound = level_groups_it
+                .peek()
+                .and_then(|res| res.as_ref().ok())
+                .map(|(key, _)| key.left_bound);
+            let child_left_bound = FacetGroupKey {
+                field_id,
+                level: child_level,
+                left_bound: child_left_bound.as_slice(),
+            };
+            let child_left_bound = Bound::Included(&child_left_bound);
+            let child_right_bound;
+            let child_right_bound = if let Some(right_bound) = right_bound {
+                child_right_bound =
+                    FacetGroupKey { field_id, level: child_level, left_bound: right_bound };
+                Bound::Excluded(&child_right_bound)
+            } else {
+                Bound::Unbounded
+            };
+            let children = database.range(rtxn, &(child_left_bound, child_right_bound))?;
+            for child in children {
+                let (child_facet_value, child_docids) = child?;
+                if child_facet_value.field_id != field_id {
+                    break;
+                }
+                if child_facet_value.level != child_level {
+                    break;
+                }
+                expected_size += 1;
+                expected_docids |= &child_docids.bitmap;
+            }
+            assert_eq!(expected_size, group_docids.size as usize);
+            assert!(expected_size <= max_group_size);
+            assert_eq!(expected_docids, group_docids.bitmap);
+            total += 1;
+            if expected_size > group_size {
+                greater_than_group += 1;
+            }
+        }
+
+        current_level -= 1;
+    }
+    if greater_than_group * 2 > total {
+        panic!("too many groups have a size > group_size");
+    }
+
+    tracing::info!("sanity checks OK");
+
+    Ok(())
+}
+
+fn facet_to_string(facet_value: &[u8], facet_type: FacetType) -> String {
+    match facet_type {
+        FacetType::String => bstr::BStr::new(facet_value).to_string(),
+        FacetType::Number => match OrderedF64Codec::bytes_decode(facet_value) {
+            Ok(value) => value.to_string(),
+            Err(e) => format!("error: {e} (bytes: {facet_value:?}"),
+        },
+    }
+}

crates/milli/src/update/facet/new_incremental.rs

@@ -0,0 +1,498 @@
+use std::ops::Bound;
+
+use heed::types::{Bytes, DecodeIgnore};
+use heed::{BytesDecode as _, Database, RwTxn};
+use roaring::RoaringBitmap;
+
+use crate::facet::FacetType;
+use crate::heed_codec::facet::{
+    FacetGroupKey, FacetGroupKeyCodec, FacetGroupValue, FacetGroupValueCodec,
+};
+use crate::heed_codec::BytesRefCodec;
+use crate::search::facet::get_highest_level;
+use crate::update::valid_facet_value;
+use crate::{FieldId, Index, Result};
+
+pub struct FacetsUpdateIncremental {
+    inner: FacetsUpdateIncrementalInner,
+    delta_data: Vec<FacetFieldIdChange>,
+}
+
+struct FacetsUpdateIncrementalInner {
+    db: Database<FacetGroupKeyCodec<BytesRefCodec>, FacetGroupValueCodec>,
+    field_id: FieldId,
+    group_size: u8,
+    min_level_size: u8,
+    max_group_size: u8,
+}
+
+impl FacetsUpdateIncremental {
+    pub fn new(
+        index: &Index,
+        facet_type: FacetType,
+        field_id: FieldId,
+        delta_data: Vec<FacetFieldIdChange>,
+        group_size: u8,
+        min_level_size: u8,
+        max_group_size: u8,
+    ) -> Self {
+        FacetsUpdateIncremental {
+            inner: FacetsUpdateIncrementalInner {
+                db: match facet_type {
+                    FacetType::String => index
+                        .facet_id_string_docids
+                        .remap_key_type::<FacetGroupKeyCodec<BytesRefCodec>>(),
+                    FacetType::Number => index
+                        .facet_id_f64_docids
+                        .remap_key_type::<FacetGroupKeyCodec<BytesRefCodec>>(),
+                },
+                field_id,
+                group_size,
+                min_level_size,
+                max_group_size,
+            },
+
+            delta_data,
+        }
+    }
+
+    #[tracing::instrument(level = "trace", skip_all, target = "indexing::facets::incremental")]
+    pub fn execute(mut self, wtxn: &mut RwTxn) -> Result<()> {
+        if self.delta_data.is_empty() {
+            return Ok(());
+        }
+        self.delta_data.sort_unstable_by(
+            |FacetFieldIdChange { facet_value: left, .. },
+             FacetFieldIdChange { facet_value: right, .. }| {
+                left.cmp(right)
+                    // sort in **reverse** lexicographic order
+                    .reverse()
+            },
+        );
+
+        self.inner.find_changed_parents(wtxn, self.delta_data)?;
+
+        self.inner.add_or_delete_level(wtxn)
+    }
+}
+
+impl FacetsUpdateIncrementalInner {
+    /// WARNING: `changed_children` must be sorted in **reverse** lexicographic order.
+    fn find_changed_parents(
+        &self,
+        wtxn: &mut RwTxn,
+        mut changed_children: Vec<FacetFieldIdChange>,
+    ) -> Result<()> {
+        let mut changed_parents = vec![];
+        for child_level in 0u8..u8::MAX {
+            // child_level < u8::MAX by construction
+            let parent_level = child_level + 1;
+            let parent_level_left_bound: FacetGroupKey<&[u8]> =
+                FacetGroupKey { field_id: self.field_id, level: parent_level, left_bound: &[] };
+
+            let mut last_parent: Option<Box<[u8]>> = None;
+            let mut child_it = changed_children
+                // drain all changed children
+                .drain(..)
+                // keep only children whose value is valid in the LMDB sense
+                .filter(|child| valid_facet_value(&child.facet_value));
+            // `while let` rather than `for` because we advance `child_it` inside of the loop
+            'current_level: while let Some(child) = child_it.next() {
+                if let Some(last_parent) = &last_parent {
+                    if &child.facet_value >= last_parent {
+                        self.compute_parent_group(wtxn, child_level, child.facet_value)?;
+                        continue 'current_level;
+                    }
+                }
+
+                // need to find a new parent
+                let parent_key_prefix = FacetGroupKey {
+                    field_id: self.field_id,
+                    level: parent_level,
+                    left_bound: &*child.facet_value,
+                };
+
+                let parent = self
+                    .db
+                    .remap_data_type::<DecodeIgnore>()
+                    .rev_range(
+                        wtxn,
+                        &(
+                            Bound::Excluded(&parent_level_left_bound),
+                            Bound::Included(&parent_key_prefix),
+                        ),
+                    )?
+                    .next();
+
+                match parent {
+                    Some(Ok((parent_key, _parent_value))) => {
+                        // found parent, cache it for next keys
+                        last_parent = Some(parent_key.left_bound.to_owned().into_boxed_slice());
+
+                        // add to modified list for parent level
+                        changed_parents.push(FacetFieldIdChange {
+                            facet_value: parent_key.left_bound.to_owned().into_boxed_slice(),
+                        });
+                        self.compute_parent_group(wtxn, child_level, child.facet_value)?;
+                    }
+                    Some(Err(err)) => return Err(err.into()),
+                    None => {
+                        // no parent for that key
+                        let mut parent_it = self
+                            .db
+                            .remap_data_type::<DecodeIgnore>()
+                            .prefix_iter_mut(wtxn, &parent_level_left_bound)?;
+                        match parent_it.next() {
+                            // 1. left of the current left bound, or
+                            Some(Ok((first_key, _first_value))) => {
+                                // make sure we don't spill on the neighboring fid (level also included defensively)
+                                if first_key.field_id != self.field_id
+                                    || first_key.level != parent_level
+                                {
+                                    // max level reached, exit
+                                    drop(parent_it);
+                                    self.compute_parent_group(
+                                        wtxn,
+                                        child_level,
+                                        child.facet_value,
+                                    )?;
+                                    for child in child_it.by_ref() {
+                                        self.compute_parent_group(
+                                            wtxn,
+                                            child_level,
+                                            child.facet_value,
+                                        )?;
+                                    }
+                                    return Ok(());
+                                }
+                                // remove old left bound
+                                unsafe { parent_it.del_current()? };
+                                drop(parent_it);
+                                changed_parents.push(FacetFieldIdChange {
+                                    facet_value: child.facet_value.clone(),
+                                });
+                                self.compute_parent_group(wtxn, child_level, child.facet_value)?;
+                                // pop all elements in order to visit the new left bound
+                                let new_left_bound =
+                                    &mut changed_parents.last_mut().unwrap().facet_value;
+                                for child in child_it.by_ref() {
+                                    new_left_bound.clone_from(&child.facet_value);
+
+                                    self.compute_parent_group(
+                                        wtxn,
+                                        child_level,
+                                        child.facet_value,
+                                    )?;
+                                }
+                            }
+                            Some(Err(err)) => return Err(err.into()),
+                            // 2. max level reached, exit
+                            None => {
+                                drop(parent_it);
+                                self.compute_parent_group(wtxn, child_level, child.facet_value)?;
+                                for child in child_it.by_ref() {
+                                    self.compute_parent_group(
+                                        wtxn,
+                                        child_level,
+                                        child.facet_value,
+                                    )?;
+                                }
+                                return Ok(());
+                            }
+                        }
+                    }
+                }
+            }
+            if changed_parents.is_empty() {
+                return Ok(());
+            }
+            drop(child_it);
+            std::mem::swap(&mut changed_children, &mut changed_parents);
+            // changed_parents is now empty because changed_children was emptied by the drain
+        }
+        Ok(())
+    }
+
+    fn compute_parent_group(
+        &self,
+        wtxn: &mut RwTxn<'_>,
+        parent_level: u8,
+        parent_left_bound: Box<[u8]>,
+    ) -> Result<()> {
+        let mut range_left_bound: Vec<u8> = parent_left_bound.into();
+        if parent_level == 0 {
+            return Ok(());
+        }
+        let child_level = parent_level - 1;
+
+        let parent_key = FacetGroupKey {
+            field_id: self.field_id,
+            level: parent_level,
+            left_bound: &*range_left_bound,
+        };
+        let child_right_bound = self
+            .db
+            .remap_data_type::<DecodeIgnore>()
+            .get_greater_than(wtxn, &parent_key)?
+            .and_then(
+                |(
+                    FacetGroupKey {
+                        level: right_level,
+                        field_id: right_fid,
+                        left_bound: right_bound,
+                    },
+                    _,
+                )| {
+                    if parent_level != right_level || self.field_id != right_fid {
+                        // there was a greater key, but with a greater level or fid, so not a sibling to the parent: ignore
+                        return None;
+                    }
+                    Some(right_bound.to_owned())
+                },
+            );
+        let child_right_bound = match &child_right_bound {
+            Some(right_bound) => Bound::Excluded(FacetGroupKey {
+                left_bound: right_bound.as_slice(),
+                field_id: self.field_id,
+                level: child_level,
+            }),
+            None => Bound::Unbounded,
+        };
+
+        let child_left_key = FacetGroupKey {
+            field_id: self.field_id,
+            level: child_level,
+            left_bound: &*range_left_bound,
+        };
+        let mut child_left_bound = Bound::Included(child_left_key);
+
+        loop {
+            // do a first pass on the range to find the number of children
+            let child_count = self
+                .db
+                .remap_data_type::<DecodeIgnore>()
+                .range(wtxn, &(child_left_bound, child_right_bound))?
+                .take(self.max_group_size as usize * 2)
+                .count();
+            let mut child_it = self.db.range(wtxn, &(child_left_bound, child_right_bound))?;
+
+            // pick the right group_size depending on the number of children
+            let group_size = if child_count >= self.max_group_size as usize * 2 {
+                // more than twice the max_group_size => there will be space for at least 2 groups of max_group_size
+                self.max_group_size as usize
+            } else if child_count >= self.group_size as usize {
+                // size in [group_size, max_group_size * 2[
+                // divided by 2 it is between [group_size / 2, max_group_size[
+                // this ensures that the tree is balanced
+                child_count / 2
+            } else {
+                // take everything
+                child_count
+            };
+
+            let res: Result<_> = child_it
+                .by_ref()
+                .take(group_size)
+                // stop if we go to the next level or field id
+                .take_while(|res| match res {
+                    Ok((child_key, _)) => {
+                        child_key.field_id == self.field_id && child_key.level == child_level
+                    }
+                    Err(_) => true,
+                })
+                .try_fold(
+                    (None, FacetGroupValue { size: 0, bitmap: Default::default() }),
+                    |(bounds, mut group_value), child_res| {
+                        let (child_key, child_value) = child_res?;
+                        let bounds = match bounds {
+                            Some((left_bound, _)) => Some((left_bound, child_key.left_bound)),
+                            None => Some((child_key.left_bound, child_key.left_bound)),
+                        };
+                        // max_group_size <= u8::MAX
+                        group_value.size += 1;
+                        group_value.bitmap |= &child_value.bitmap;
+                        Ok((bounds, group_value))
+                    },
+                );
+
+            let (bounds, group_value) = res?;
+
+            let Some((group_left_bound, right_bound)) = bounds else {
+                let update_key = FacetGroupKey {
+                    field_id: self.field_id,
+                    level: parent_level,
+                    left_bound: &*range_left_bound,
+                };
+                drop(child_it);
+                if let Bound::Included(_) = child_left_bound {
+                    self.db.delete(wtxn, &update_key)?;
+                }
+
+                break;
+            };
+
+            drop(child_it);
+            let current_left_bound = group_left_bound.to_owned();
+
+            let delete_old_bound = match child_left_bound {
+                Bound::Included(bound) => {
+                    if bound.left_bound != current_left_bound {
+                        Some(range_left_bound.clone())
+                    } else {
+                        None
+                    }
+                }
+                _ => None,
+            };
+
+            range_left_bound.clear();
+            range_left_bound.extend_from_slice(right_bound);
+            let child_left_key = FacetGroupKey {
+                field_id: self.field_id,
+                level: child_level,
+                left_bound: range_left_bound.as_slice(),
+            };
+            child_left_bound = Bound::Excluded(child_left_key);
+
+            if let Some(old_bound) = delete_old_bound {
+                let update_key = FacetGroupKey {
+                    field_id: self.field_id,
+                    level: parent_level,
+                    left_bound: old_bound.as_slice(),
+                };
+                self.db.delete(wtxn, &update_key)?;
+            }
+
+            let update_key = FacetGroupKey {
+                field_id: self.field_id,
+                level: parent_level,
+                left_bound: current_left_bound.as_slice(),
+            };
+            if group_value.bitmap.is_empty() {
+                self.db.delete(wtxn, &update_key)?;
+            } else {
+                self.db.put(wtxn, &update_key, &group_value)?;
+            }
+        }
+
+        Ok(())
+    }
+
+    /// Check whether the highest level has exceeded `min_level_size` * `self.group_size`.
+    /// If it has, we must build an addition level above it.
+    /// Then check whether the highest level is under `min_level_size`.
+    /// If it has, we must remove the complete level.
+    pub(crate) fn add_or_delete_level(&self, txn: &mut RwTxn<'_>) -> Result<()> {
+        let highest_level = get_highest_level(txn, self.db, self.field_id)?;
+        let mut highest_level_prefix = vec![];
+        highest_level_prefix.extend_from_slice(&self.field_id.to_be_bytes());
+        highest_level_prefix.push(highest_level);
+
+        let size_highest_level =
+            self.db.remap_types::<Bytes, Bytes>().prefix_iter(txn, &highest_level_prefix)?.count();
+
+        if size_highest_level >= self.group_size as usize * self.min_level_size as usize {
+            self.add_level(txn, highest_level, &highest_level_prefix, size_highest_level)
+        } else if size_highest_level < self.min_level_size as usize && highest_level != 0 {
+            self.delete_level(txn, &highest_level_prefix)
+        } else {
+            Ok(())
+        }
+    }
+
+    /// Delete a level.
+    fn delete_level(&self, txn: &mut RwTxn<'_>, highest_level_prefix: &[u8]) -> Result<()> {
+        let mut to_delete = vec![];
+        let mut iter =
+            self.db.remap_types::<Bytes, Bytes>().prefix_iter(txn, highest_level_prefix)?;
+        for el in iter.by_ref() {
+            let (k, _) = el?;
+            to_delete.push(
+                FacetGroupKeyCodec::<BytesRefCodec>::bytes_decode(k)
+                    .map_err(heed::Error::Encoding)?
+                    .into_owned(),
+            );
+        }
+        drop(iter);
+        for k in to_delete {
+            self.db.delete(txn, &k.as_ref())?;
+        }
+        Ok(())
+    }
+
+    /// Build an additional level for the field id.
+    fn add_level(
+        &self,
+        txn: &mut RwTxn<'_>,
+        highest_level: u8,
+        highest_level_prefix: &[u8],
+        size_highest_level: usize,
+    ) -> Result<()> {
+        let mut groups_iter = self
+            .db
+            .remap_types::<Bytes, FacetGroupValueCodec>()
+            .prefix_iter(txn, highest_level_prefix)?;
+
+        let nbr_new_groups = size_highest_level / self.group_size as usize;
+        let nbr_leftover_elements = size_highest_level % self.group_size as usize;
+
+        let mut to_add = vec![];
+        for _ in 0..nbr_new_groups {
+            let mut first_key = None;
+            let mut values = RoaringBitmap::new();
+            for _ in 0..self.group_size {
+                let (key_bytes, value_i) = groups_iter.next().unwrap()?;
+                let key_i = FacetGroupKeyCodec::<BytesRefCodec>::bytes_decode(key_bytes)
+                    .map_err(heed::Error::Encoding)?;
+
+                if first_key.is_none() {
+                    first_key = Some(key_i);
+                }
+                values |= value_i.bitmap;
+            }
+            let key = FacetGroupKey {
+                field_id: self.field_id,
+                level: highest_level + 1,
+                left_bound: first_key.unwrap().left_bound,
+            };
+            let value = FacetGroupValue { size: self.group_size, bitmap: values };
+            to_add.push((key.into_owned(), value));
+        }
+        // now we add the rest of the level, in case its size is > group_size * min_level_size
+        // this can indeed happen if the min_level_size parameter changes between two calls to `insert`
+        if nbr_leftover_elements > 0 {
+            let mut first_key = None;
+            let mut values = RoaringBitmap::new();
+            for _ in 0..nbr_leftover_elements {
+                let (key_bytes, value_i) = groups_iter.next().unwrap()?;
+                let key_i = FacetGroupKeyCodec::<BytesRefCodec>::bytes_decode(key_bytes)
+                    .map_err(heed::Error::Encoding)?;
+
+                if first_key.is_none() {
+                    first_key = Some(key_i);
+                }
+                values |= value_i.bitmap;
+            }
+            let key = FacetGroupKey {
+                field_id: self.field_id,
+                level: highest_level + 1,
+                left_bound: first_key.unwrap().left_bound,
+            };
+            // Note: nbr_leftover_elements can be casted to a u8 since it is bounded by `max_group_size`
+            // when it is created above.
+            let value = FacetGroupValue { size: nbr_leftover_elements as u8, bitmap: values };
+            to_add.push((key.into_owned(), value));
+        }
+
+        drop(groups_iter);
+        for (key, value) in to_add {
+            self.db.put(txn, &key.as_ref(), &value)?;
+        }
+        Ok(())
+    }
+}
+
+#[derive(Debug)]
+pub struct FacetFieldIdChange {
+    pub facet_value: Box<[u8]>,
+}