dd7cb14a56
Optimization for DisjunctionSearcher, where an extra matchingIdxs helps track the currs that were matching. This avoids the previous code's second loop through the currs slice.
229 lines
5.9 KiB
Go
229 lines
5.9 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package searchers
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import (
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"fmt"
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"math"
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"sort"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/search"
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"github.com/blevesearch/bleve/search/scorers"
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)
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// DisjunctionMaxClauseCount is a compile time setting that applications can
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// adjust to non-zero value to cause the DisjunctionSearcher to return an
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// error instead of exeucting searches when the size exceeds this value.
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var DisjunctionMaxClauseCount = 0
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type DisjunctionSearcher struct {
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indexReader index.IndexReader
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searchers OrderedSearcherList
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queryNorm float64
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currs []*search.DocumentMatch
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currentID index.IndexInternalID
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scorer *scorers.DisjunctionQueryScorer
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min float64
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matching []*search.DocumentMatch
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matchingIdxs []int
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initialized bool
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}
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func tooManyClauses(count int) bool {
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if DisjunctionMaxClauseCount != 0 && count > DisjunctionMaxClauseCount {
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return true
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}
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return false
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}
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func tooManyClausesErr() error {
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return fmt.Errorf("TooManyClauses[maxClauseCount is set to %d]", DisjunctionMaxClauseCount)
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}
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func NewDisjunctionSearcher(indexReader index.IndexReader, qsearchers []search.Searcher, min float64, explain bool) (*DisjunctionSearcher, error) {
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if tooManyClauses(len(qsearchers)) {
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return nil, tooManyClausesErr()
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}
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// build the downstream searchers
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searchers := make(OrderedSearcherList, len(qsearchers))
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for i, searcher := range qsearchers {
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searchers[i] = searcher
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}
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// sort the searchers
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sort.Sort(sort.Reverse(searchers))
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// build our searcher
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rv := DisjunctionSearcher{
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indexReader: indexReader,
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searchers: searchers,
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currs: make([]*search.DocumentMatch, len(searchers)),
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scorer: scorers.NewDisjunctionQueryScorer(explain),
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min: min,
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matching: make([]*search.DocumentMatch, len(searchers)),
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matchingIdxs: make([]int, len(searchers)),
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}
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rv.computeQueryNorm()
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return &rv, nil
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}
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func (s *DisjunctionSearcher) computeQueryNorm() {
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// first calculate sum of squared weights
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sumOfSquaredWeights := 0.0
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for _, termSearcher := range s.searchers {
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sumOfSquaredWeights += termSearcher.Weight()
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}
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// now compute query norm from this
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s.queryNorm = 1.0 / math.Sqrt(sumOfSquaredWeights)
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// finally tell all the downstream searchers the norm
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for _, termSearcher := range s.searchers {
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termSearcher.SetQueryNorm(s.queryNorm)
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}
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}
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func (s *DisjunctionSearcher) initSearchers(ctx *search.SearchContext) error {
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var err error
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// get all searchers pointing at their first match
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for i, termSearcher := range s.searchers {
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if s.currs[i] != nil {
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ctx.DocumentMatchPool.Put(s.currs[i])
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}
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s.currs[i], err = termSearcher.Next(ctx)
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if err != nil {
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return err
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}
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}
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s.currentID = s.nextSmallestID()
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s.initialized = true
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return nil
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}
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func (s *DisjunctionSearcher) nextSmallestID() index.IndexInternalID {
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var rv index.IndexInternalID
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for _, curr := range s.currs {
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if curr != nil && (curr.IndexInternalID.Compare(rv) < 0 || rv == nil) {
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rv = curr.IndexInternalID
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}
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}
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return rv
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}
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func (s *DisjunctionSearcher) Weight() float64 {
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var rv float64
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for _, searcher := range s.searchers {
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rv += searcher.Weight()
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}
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return rv
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}
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func (s *DisjunctionSearcher) SetQueryNorm(qnorm float64) {
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for _, searcher := range s.searchers {
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searcher.SetQueryNorm(qnorm)
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}
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}
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func (s *DisjunctionSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
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if !s.initialized {
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err := s.initSearchers(ctx)
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if err != nil {
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return nil, err
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}
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}
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var err error
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var rv *search.DocumentMatch
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found := false
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for !found && s.currentID != nil {
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matching := s.matching[:0]
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matchingIdxs := s.matchingIdxs[:0]
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for i, curr := range s.currs {
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if curr != nil && curr.IndexInternalID.Equals(s.currentID) {
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matching = append(matching, curr)
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matchingIdxs = append(matchingIdxs, i)
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}
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}
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if len(matching) >= int(s.min) {
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found = true
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// score this match
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rv = s.scorer.Score(ctx, matching, len(matching), len(s.searchers))
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}
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// invoke next on all the matching searchers
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for _, i := range matchingIdxs {
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searcher := s.searchers[i]
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if s.currs[i] != rv {
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ctx.DocumentMatchPool.Put(s.currs[i])
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}
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s.currs[i], err = searcher.Next(ctx)
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if err != nil {
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return nil, err
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}
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}
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s.currentID = s.nextSmallestID()
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}
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return rv, nil
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}
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func (s *DisjunctionSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
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if !s.initialized {
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err := s.initSearchers(ctx)
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if err != nil {
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return nil, err
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}
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}
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// get all searchers pointing at their first match
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var err error
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for i, termSearcher := range s.searchers {
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if s.currs[i] != nil {
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ctx.DocumentMatchPool.Put(s.currs[i])
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}
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s.currs[i], err = termSearcher.Advance(ctx, ID)
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if err != nil {
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return nil, err
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}
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}
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s.currentID = s.nextSmallestID()
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return s.Next(ctx)
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}
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func (s *DisjunctionSearcher) Count() uint64 {
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// for now return a worst case
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var sum uint64
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for _, searcher := range s.searchers {
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sum += searcher.Count()
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}
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return sum
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}
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func (s *DisjunctionSearcher) Close() error {
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for _, searcher := range s.searchers {
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err := searcher.Close()
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (s *DisjunctionSearcher) Min() int {
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return int(s.min) // FIXME just make this an int
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}
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func (s *DisjunctionSearcher) DocumentMatchPoolSize() int {
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rv := len(s.currs)
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for _, s := range s.searchers {
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rv += s.DocumentMatchPoolSize()
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}
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return rv
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}
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