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Improve the QueryEnhancer by doing a single lookup

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Clément Renault 2019-12-06 12:10:28 +01:00
parent 902625601a
commit f87c67fcad
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GPG Key ID: 0151CDAB43460DAE
1 changed files with 59 additions and 46 deletions
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105
meilisearch-core/src/automaton/query_enhancer.rs
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@ -147,63 +147,76 @@ impl<S: AsRef<str>> QueryEnhancerBuilder<'_, S> {
}
pub fn build(self) -> QueryEnhancer {
QueryEnhancer {
origins: self.origins,
real_to_origin: FakeIntervalTree::new(self.real_to_origin),
let interval_tree = FakeIntervalTree::new(self.real_to_origin);
let mut table = Vec::new();
for real in 0.. {
match replacement(&self.origins, &interval_tree, real) {
Some(range) => table.push(range),
None => break,
}
}
QueryEnhancer { table }
}
}
/// Returns the query indices that represent this real query index.
fn replacement(
origins: &[usize],
real_to_origin: &FakeIntervalTree,
real: u32,
) -> Option<Range<u32>>
{
let real = real as usize;
// query the fake interval tree with the real query index
let (range, (origin, real_length)) = real_to_origin.query(real)?;
// if `real` is the end bound of the range
if (range.start + real_length - 1) == real {
let mut count = range.len();
let mut new_origin = origin;
for (i, slice) in origins[new_origin..].windows(2).enumerate() {
let len = slice[1] - slice[0];
count = count.saturating_sub(len);
if count == 0 {
new_origin = origin + i;
break;
}
}
let n = real - range.start;
let start = origins[origin];
let end = origins[new_origin + 1];
let remaining = (end - start) - n;
Some(Range {
start: (start + n) as u32,
end: (start + n + remaining) as u32,
})
} else {
// just return the origin along with
// the real position of the word
let n = real as usize - range.start;
let origin = origins[origin];
Some(Range {
start: (origin + n) as u32,
end: (origin + n + 1) as u32,
})
}
}
#[derive(Debug)]
pub struct QueryEnhancer {
origins: Vec<usize>,
real_to_origin: FakeIntervalTree,
table: Vec<Range<u32>>,
}
impl QueryEnhancer {
/// Returns the query indices that represent this real query index.
pub fn replacement(&self, real: u32) -> Range<u32> {
let real = real as usize;
// query the fake interval tree with the real query index
let (range, (origin, real_length)) = self
.real_to_origin
.query(real)
.expect("real has never been declared");
// if `real` is the end bound of the range
if (range.start + real_length - 1) == real {
let mut count = range.len();
let mut new_origin = origin;
for (i, slice) in self.origins[new_origin..].windows(2).enumerate() {
let len = slice[1] - slice[0];
count = count.saturating_sub(len);
if count == 0 {
new_origin = origin + i;
break;
}
}
let n = real - range.start;
let start = self.origins[origin];
let end = self.origins[new_origin + 1];
let remaining = (end - start) - n;
Range {
start: (start + n) as u32,
end: (start + n + remaining) as u32,
}
} else {
// just return the origin along with
// the real position of the word
let n = real as usize - range.start;
let origin = self.origins[origin];
Range {
start: (origin + n) as u32,
end: (origin + n + 1) as u32,
}
}
self.table[real as usize].clone()
}
}