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Add some documentation to facets.rs

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This commit is contained in:
Loïc Lecrenier 2022-08-17 12:58:11 +02:00
parent 39687908f1
commit 6cc975704d
1 changed files with 17 additions and 1 deletions
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18
milli/src/update/facets.rs
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@ -165,11 +165,15 @@ impl<'t, 'u, 'i> Facets<'t, 'u, 'i> {
}
}
/// The number of elements from the level below that are represented by a single element in the level above
///
/// This setting is always greater than or equal to 2.
pub fn level_group_size(&mut self, value: NonZeroUsize) -> &mut Self {
self.level_group_size = NonZeroUsize::new(cmp::max(value.get(), 2)).unwrap();
self
}
/// The minimum number of elements that a level is allowed to have.
pub fn min_level_size(&mut self, value: NonZeroUsize) -> &mut Self {
self.min_level_size = value;
self
@ -252,6 +256,12 @@ impl<'t, 'u, 'i> Facets<'t, 'u, 'i> {
}
}
/// Compute the content of the database levels from its level 0 for the given field id.
///
/// ## Returns:
/// 1. a vector of grenad::Reader. The reader at index `i` corresponds to the elements of level `i + 1`
/// that must be inserted into the database.
/// 2. a roaring bitmap of all the document ids present in the database
fn compute_facet_number_levels<'t>(
rtxn: &'t heed::RoTxn,
db: heed::Database<FacetLevelValueF64Codec, CboRoaringBitmapCodec>,
@ -316,6 +326,12 @@ fn compute_facet_number_levels<'t>(
}
}
/// Compute the content of the database levels from its level 0 for the given field id.
///
/// ## Returns:
/// 1. a vector of grenad::Reader. The reader at index `i` corresponds to the elements of level `i + 1`
/// that must be inserted into the database.
/// 2. a roaring bitmap of all the document ids present in the database
fn compute_facet_strings_levels<'t>(
rtxn: &'t heed::RoTxn,
db: heed::Database<FacetStringLevelZeroCodec, FacetStringLevelZeroValueCodec>,
@ -401,7 +417,7 @@ will contain the new levels
* `level_0_range` : equivalent to `level_0_start..`
* `level_0_size` : the number of elements in level 0
* `level_group_size` : the number of elements from the level below that are represented by a
* single element of the new level
single element of the new level
* `computed_group_bitmap` : a callback that is called whenever at most `level_group_size` elements
from the level below were read/created. Its arguments are:
0. the list of bitmaps from each read/created element of the level below