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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::docset::{DocSet, TERMINATED}; |
| <span class="kw">use </span><span class="kw">crate</span>::query::term_query::TermScorer; |
| <span class="kw">use </span><span class="kw">crate</span>::query::{EmptyScorer, Scorer}; |
| <span class="kw">use crate</span>::{DocId, Score}; |
| |
| <span class="doccomment">/// Returns the intersection scorer. |
| /// |
| /// The score associated with the documents is the sum of the |
| /// score of the `Scorer`s given in argument. |
| /// |
| /// For better performance, the function uses a |
| /// specialized implementation if the two |
| /// shortest scorers are `TermScorer`s. |
| </span><span class="kw">pub fn </span>intersect_scorers(<span class="kw-2">mut </span>scorers: Vec<Box<<span class="kw">dyn </span>Scorer>>) -> Box<<span class="kw">dyn </span>Scorer> { |
| <span class="kw">if </span>scorers.is_empty() { |
| <span class="kw">return </span>Box::new(EmptyScorer); |
| } |
| <span class="kw">if </span>scorers.len() == <span class="number">1 </span>{ |
| <span class="kw">return </span>scorers.pop().unwrap(); |
| } |
| scorers.sort_by_key(|scorer| scorer.size_hint()); |
| <span class="kw">let </span>doc = go_to_first_doc(<span class="kw-2">&mut </span>scorers[..]); |
| <span class="kw">if </span>doc == TERMINATED { |
| <span class="kw">return </span>Box::new(EmptyScorer); |
| } |
| <span class="comment">// We know that we have at least 2 elements. |
| </span><span class="kw">let </span>left = scorers.remove(<span class="number">0</span>); |
| <span class="kw">let </span>right = scorers.remove(<span class="number">0</span>); |
| <span class="kw">let </span>all_term_scorers = [<span class="kw-2">&</span>left, <span class="kw-2">&</span>right] |
| .iter() |
| .all(|<span class="kw-2">&</span>scorer| scorer.is::<TermScorer>()); |
| <span class="kw">if </span>all_term_scorers { |
| <span class="kw">return </span>Box::new(Intersection { |
| left: <span class="kw-2">*</span>(left.downcast::<TermScorer>().map_err(|<span class="kw">_</span>| ()).unwrap()), |
| right: <span class="kw-2">*</span>(right.downcast::<TermScorer>().map_err(|<span class="kw">_</span>| ()).unwrap()), |
| others: scorers, |
| }); |
| } |
| Box::new(Intersection { |
| left, |
| right, |
| others: scorers, |
| }) |
| } |
| |
| <span class="doccomment">/// Creates a `DocSet` that iterate through the intersection of two or more `DocSet`s. |
| </span><span class="kw">pub struct </span>Intersection<TDocSet: DocSet, TOtherDocSet: DocSet = Box<<span class="kw">dyn </span>Scorer>> { |
| left: TDocSet, |
| right: TDocSet, |
| others: Vec<TOtherDocSet>, |
| } |
| |
| <span class="kw">fn </span>go_to_first_doc<TDocSet: DocSet>(docsets: <span class="kw-2">&mut </span>[TDocSet]) -> DocId { |
| <span class="macro">assert!</span>(!docsets.is_empty()); |
| <span class="kw">let </span><span class="kw-2">mut </span>candidate = docsets.iter().map(TDocSet::doc).max().unwrap(); |
| <span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="kw">for </span>docset <span class="kw">in </span>docsets.iter_mut() { |
| <span class="kw">let </span>seek_doc = docset.seek(candidate); |
| <span class="kw">if </span>seek_doc > candidate { |
| candidate = docset.doc(); |
| <span class="kw">continue </span><span class="lifetime">'outer</span>; |
| } |
| } |
| <span class="kw">return </span>candidate; |
| } |
| } |
| |
| <span class="kw">impl</span><TDocSet: DocSet> Intersection<TDocSet, TDocSet> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(<span class="kw-2">mut </span>docsets: Vec<TDocSet>) -> Intersection<TDocSet, TDocSet> { |
| <span class="kw">let </span>num_docsets = docsets.len(); |
| <span class="macro">assert!</span>(num_docsets >= <span class="number">2</span>); |
| docsets.sort_by_key(|docset| docset.size_hint()); |
| go_to_first_doc(<span class="kw-2">&mut </span>docsets); |
| <span class="kw">let </span>left = docsets.remove(<span class="number">0</span>); |
| <span class="kw">let </span>right = docsets.remove(<span class="number">0</span>); |
| Intersection { |
| left, |
| right, |
| others: docsets, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><TDocSet: DocSet> Intersection<TDocSet, TDocSet> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>docset_mut_specialized(<span class="kw-2">&mut </span><span class="self">self</span>, ord: usize) -> <span class="kw-2">&mut </span>TDocSet { |
| <span class="kw">match </span>ord { |
| <span class="number">0 </span>=> <span class="kw-2">&mut </span><span class="self">self</span>.left, |
| <span class="number">1 </span>=> <span class="kw-2">&mut </span><span class="self">self</span>.right, |
| n => <span class="kw-2">&mut </span><span class="self">self</span>.others[n - <span class="number">2</span>], |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><TDocSet: DocSet, TOtherDocSet: DocSet> DocSet <span class="kw">for </span>Intersection<TDocSet, TOtherDocSet> { |
| <span class="kw">fn </span>advance(<span class="kw-2">&mut </span><span class="self">self</span>) -> DocId { |
| <span class="kw">let </span>(left, right) = (<span class="kw-2">&mut </span><span class="self">self</span>.left, <span class="kw-2">&mut </span><span class="self">self</span>.right); |
| <span class="kw">let </span><span class="kw-2">mut </span>candidate = left.advance(); |
| |
| <span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="comment">// In the first part we look for a document in the intersection |
| // of the two rarest `DocSet` in the intersection. |
| |
| </span><span class="kw">loop </span>{ |
| <span class="kw">let </span>right_doc = right.seek(candidate); |
| candidate = left.seek(right_doc); |
| <span class="kw">if </span>candidate == right_doc { |
| <span class="kw">break</span>; |
| } |
| } |
| |
| <span class="macro">debug_assert_eq!</span>(left.doc(), right.doc()); |
| <span class="comment">// test the remaining scorers; |
| </span><span class="kw">for </span>docset <span class="kw">in </span><span class="self">self</span>.others.iter_mut() { |
| <span class="kw">let </span>seek_doc = docset.seek(candidate); |
| <span class="kw">if </span>seek_doc > candidate { |
| candidate = left.seek(seek_doc); |
| <span class="kw">continue </span><span class="lifetime">'outer</span>; |
| } |
| } |
| <span class="macro">debug_assert_eq!</span>(candidate, <span class="self">self</span>.left.doc()); |
| <span class="macro">debug_assert_eq!</span>(candidate, <span class="self">self</span>.right.doc()); |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.others.iter().all(|docset| docset.doc() == candidate)); |
| <span class="kw">return </span>candidate; |
| } |
| } |
| |
| <span class="kw">fn </span>seek(<span class="kw-2">&mut </span><span class="self">self</span>, target: DocId) -> DocId { |
| <span class="self">self</span>.left.seek(target); |
| <span class="kw">let </span><span class="kw-2">mut </span>docsets: Vec<<span class="kw-2">&mut </span><span class="kw">dyn </span>DocSet> = <span class="macro">vec!</span>[<span class="kw-2">&mut </span><span class="self">self</span>.left, <span class="kw-2">&mut </span><span class="self">self</span>.right]; |
| <span class="kw">for </span>docset <span class="kw">in </span><span class="kw-2">&mut </span><span class="self">self</span>.others { |
| docsets.push(docset); |
| } |
| <span class="kw">let </span>doc = go_to_first_doc(<span class="kw-2">&mut </span>docsets[..]); |
| <span class="macro">debug_assert!</span>(docsets.iter().all(|docset| docset.doc() == doc)); |
| <span class="macro">debug_assert!</span>(doc >= target); |
| doc |
| } |
| |
| <span class="kw">fn </span>doc(<span class="kw-2">&</span><span class="self">self</span>) -> DocId { |
| <span class="self">self</span>.left.doc() |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> u32 { |
| <span class="self">self</span>.left.size_hint() |
| } |
| } |
| |
| <span class="kw">impl</span><TScorer, TOtherScorer> Scorer <span class="kw">for </span>Intersection<TScorer, TOtherScorer> |
| <span class="kw">where |
| </span>TScorer: Scorer, |
| TOtherScorer: Scorer, |
| { |
| <span class="kw">fn </span>score(<span class="kw-2">&mut </span><span class="self">self</span>) -> Score { |
| <span class="self">self</span>.left.score() |
| + <span class="self">self</span>.right.score() |
| + <span class="self">self</span>.others.iter_mut().map(Scorer::score).sum::<Score>() |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span><span class="kw">super</span>::Intersection; |
| <span class="kw">use </span><span class="kw">crate</span>::docset::{DocSet, TERMINATED}; |
| <span class="kw">use </span><span class="kw">crate</span>::postings::tests::test_skip_against_unoptimized; |
| <span class="kw">use </span><span class="kw">crate</span>::query::VecDocSet; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_intersection() { |
| { |
| <span class="kw">let </span>left = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">3</span>, <span class="number">9</span>]); |
| <span class="kw">let </span>right = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">9</span>, <span class="number">18</span>]); |
| <span class="kw">let </span><span class="kw-2">mut </span>intersection = Intersection::new(<span class="macro">vec!</span>[left, right]); |
| <span class="macro">assert_eq!</span>(intersection.doc(), <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(intersection.advance(), <span class="number">9</span>); |
| <span class="macro">assert_eq!</span>(intersection.doc(), <span class="number">9</span>); |
| <span class="macro">assert_eq!</span>(intersection.advance(), TERMINATED); |
| } |
| { |
| <span class="kw">let </span>a = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">3</span>, <span class="number">9</span>]); |
| <span class="kw">let </span>b = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">9</span>, <span class="number">18</span>]); |
| <span class="kw">let </span>c = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">5</span>, <span class="number">9</span>, <span class="number">111</span>]); |
| <span class="kw">let </span><span class="kw-2">mut </span>intersection = Intersection::new(<span class="macro">vec!</span>[a, b, c]); |
| <span class="macro">assert_eq!</span>(intersection.doc(), <span class="number">9</span>); |
| <span class="macro">assert_eq!</span>(intersection.advance(), TERMINATED); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_intersection_zero() { |
| <span class="kw">let </span>left = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">0</span>]); |
| <span class="kw">let </span>right = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">0</span>]); |
| <span class="kw">let </span><span class="kw-2">mut </span>intersection = Intersection::new(<span class="macro">vec!</span>[left, right]); |
| <span class="macro">assert_eq!</span>(intersection.doc(), <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(intersection.advance(), TERMINATED); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_intersection_skip() { |
| <span class="kw">let </span>left = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>]); |
| <span class="kw">let </span>right = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">2</span>, <span class="number">5</span>]); |
| <span class="kw">let </span><span class="kw-2">mut </span>intersection = Intersection::new(<span class="macro">vec!</span>[left, right]); |
| <span class="macro">assert_eq!</span>(intersection.seek(<span class="number">2</span>), <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(intersection.doc(), <span class="number">2</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_intersection_skip_against_unoptimized() { |
| test_skip_against_unoptimized( |
| || { |
| <span class="kw">let </span>left = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">4</span>]); |
| <span class="kw">let </span>right = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">2</span>, <span class="number">5</span>]); |
| Box::new(Intersection::new(<span class="macro">vec!</span>[left, right])) |
| }, |
| <span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">2</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>], |
| ); |
| test_skip_against_unoptimized( |
| || { |
| <span class="kw">let </span><span class="kw-2">mut </span>left = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]); |
| <span class="kw">let </span><span class="kw-2">mut </span>right = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">2</span>, <span class="number">5</span>, <span class="number">10</span>]); |
| left.advance(); |
| right.advance(); |
| Box::new(Intersection::new(<span class="macro">vec!</span>[left, right])) |
| }, |
| <span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">10</span>, <span class="number">11</span>], |
| ); |
| test_skip_against_unoptimized( |
| || { |
| Box::new(Intersection::new(<span class="macro">vec!</span>[ |
| VecDocSet::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]), |
| VecDocSet::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">5</span>, <span class="number">6</span>]), |
| VecDocSet::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]), |
| VecDocSet::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">5</span>, <span class="number">6</span>]), |
| VecDocSet::from(<span class="macro">vec!</span>[<span class="number">2</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">7</span>, <span class="number">8</span>]), |
| ])) |
| }, |
| <span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">10</span>, <span class="number">11</span>], |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_intersection_empty() { |
| <span class="kw">let </span>a = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">3</span>]); |
| <span class="kw">let </span>b = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">4</span>]); |
| <span class="kw">let </span>c = VecDocSet::from(<span class="macro">vec!</span>[<span class="number">3</span>, <span class="number">9</span>]); |
| <span class="kw">let </span>intersection = Intersection::new(<span class="macro">vec!</span>[a, b, c]); |
| <span class="macro">assert_eq!</span>(intersection.doc(), TERMINATED); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tantivy" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |