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Make a small code clean-up

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many 2021-04-12 11:19:25 +02:00
parent 17c8c6f945
commit 0efa011e09
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GPG Key ID: 2CEF23B75189EACA
1 changed files with 47 additions and 43 deletions
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90
milli/src/search/criteria/attribute.rs
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@ -326,30 +326,25 @@ impl<'t, 'q> QueryLevelIterator<'t, 'q> {
struct Branch<'t, 'q> {
query_level_iterator: QueryLevelIterator<'t, 'q>,
last_result: Option<(u32, u32, RoaringBitmap)>,
last_result: (u32, u32, RoaringBitmap),
tree_level: TreeLevel,
branch_size: u32,
}
impl<'t, 'q> Branch<'t, 'q> {
fn cmp(&self, other: &Self) -> Ordering {
fn compute_rank(left: u32, branch_size: u32) -> u32 { left.saturating_sub((0..branch_size).sum()) / branch_size }
match (&self.last_result, &other.last_result) {
(Some((s_left, _, _)), Some((o_left, _, _))) => {
// we compute a rank from the left interval.
let self_rank = compute_rank(*s_left, self.branch_size);
let other_rank = compute_rank(*o_left, other.branch_size);
let left_cmp = self_rank.cmp(&other_rank).reverse();
// on level: higher is better,
// we want to reduce highest levels first.
let level_cmp = self.tree_level.cmp(&other.tree_level);
let compute_rank = |left: u32, branch_size: u32| left.saturating_sub((0..branch_size).sum()) / branch_size;
let (s_left, _, _) = self.last_result;
let (o_left, _, _) = other.last_result;
// we compute a rank from the left interval.
let self_rank = compute_rank(s_left, self.branch_size);
let other_rank = compute_rank(o_left, other.branch_size);
let left_cmp = self_rank.cmp(&other_rank).reverse();
// on level: higher is better,
// we want to reduce highest levels first.
let level_cmp = self.tree_level.cmp(&other.tree_level);
left_cmp.then(level_cmp)
},
(Some(_), None) => Ordering::Greater,
(None, Some(_)) => Ordering::Less,
(None, None) => Ordering::Equal,
}
left_cmp.then(level_cmp)
}
}
@ -407,13 +402,15 @@ fn initialize_query_level_iterators<'t, 'q>(
if let Some(mut folded_query_level_iterators) = folded_query_level_iterators {
let (tree_level, last_result) = folded_query_level_iterators.next()?;
let branch = Branch {
last_result,
tree_level,
query_level_iterator: folded_query_level_iterators,
branch_size: branch.len() as u32,
};
positions.push(branch);
if let Some(last_result) = last_result {
let branch = Branch {
last_result,
tree_level,
query_level_iterator: folded_query_level_iterators,
branch_size: branch.len() as u32,
};
positions.push(branch);
}
}
}
@ -433,28 +430,35 @@ fn set_compute_candidates<'t>(
while let Some(mut branch) = branches_heap.peek_mut() {
let is_lowest_level = branch.tree_level == lowest_level;
match branch.last_result.as_mut() {
Some((_, _, candidates)) => {
candidates.intersect_with(&allowed_candidates);
if candidates.len() > 0 && is_lowest_level {
// we have candidates, but we can't dig deeper, return candidates.
final_candidates = Some(std::mem::take(candidates));
break;
} else if candidates.len() > 0 {
// we have candidates, lets dig deeper in levels.
let mut query_level_iterator = branch.query_level_iterator.dig(ctx)?;
let (tree_level, last_result) = query_level_iterator.next()?;
let (_, _, candidates) = &mut branch.last_result;
candidates.intersect_with(&allowed_candidates);
if candidates.is_empty() {
// we don't have candidates, get next interval.
match branch.query_level_iterator.next()? {
(_, Some(last_result)) => {
branch.last_result = last_result;
},
// TODO clean up this
(_, None) => { std::collections::binary_heap::PeekMut::<'_, Branch<'_, '_>>::pop(branch); },
}
}
else if is_lowest_level {
// we have candidates, but we can't dig deeper, return candidates.
final_candidates = Some(take(candidates));
break;
} else {
// we have candidates, lets dig deeper in levels.
let mut query_level_iterator = branch.query_level_iterator.dig(ctx)?;
match query_level_iterator.next()? {
(tree_level, Some(last_result)) => {
branch.query_level_iterator = query_level_iterator;
branch.tree_level = tree_level;
branch.last_result = last_result;
} else {
// we don't have candidates, get next interval.
let (_, last_result) = branch.query_level_iterator.next()?;
branch.last_result = last_result;
}
},
// None = no candidates to find.
None => break,
},
// TODO clean up this
(_, None) => { std::collections::binary_heap::PeekMut::<'_, Branch<'_, '_>>::pop(branch); },
}
}
}