1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
// Copyright (c) 2014 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package searcher
import (
"math"
"sort"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/search/scorer"
)
type ConjunctionSearcher struct {
indexReader index.IndexReader
searchers OrderedSearcherList
queryNorm float64
currs []*search.DocumentMatch
maxIDIdx int
scorer *scorer.ConjunctionQueryScorer
initialized bool
options search.SearcherOptions
}
func NewConjunctionSearcher(indexReader index.IndexReader, qsearchers []search.Searcher, options search.SearcherOptions) (*ConjunctionSearcher, error) {
// build the downstream searchers
searchers := make(OrderedSearcherList, len(qsearchers))
for i, searcher := range qsearchers {
searchers[i] = searcher
}
// sort the searchers
sort.Sort(searchers)
// build our searcher
rv := ConjunctionSearcher{
indexReader: indexReader,
options: options,
searchers: searchers,
currs: make([]*search.DocumentMatch, len(searchers)),
scorer: scorer.NewConjunctionQueryScorer(options),
}
rv.computeQueryNorm()
return &rv, nil
}
func (s *ConjunctionSearcher) computeQueryNorm() {
// first calculate sum of squared weights
sumOfSquaredWeights := 0.0
for _, termSearcher := range s.searchers {
sumOfSquaredWeights += termSearcher.Weight()
}
// now compute query norm from this
s.queryNorm = 1.0 / math.Sqrt(sumOfSquaredWeights)
// finally tell all the downstream searchers the norm
for _, termSearcher := range s.searchers {
termSearcher.SetQueryNorm(s.queryNorm)
}
}
func (s *ConjunctionSearcher) initSearchers(ctx *search.SearchContext) error {
var err error
// get all searchers pointing at their first match
for i, termSearcher := range s.searchers {
if s.currs[i] != nil {
ctx.DocumentMatchPool.Put(s.currs[i])
}
s.currs[i], err = termSearcher.Next(ctx)
if err != nil {
return err
}
}
s.initialized = true
return nil
}
func (s *ConjunctionSearcher) Weight() float64 {
var rv float64
for _, searcher := range s.searchers {
rv += searcher.Weight()
}
return rv
}
func (s *ConjunctionSearcher) SetQueryNorm(qnorm float64) {
for _, searcher := range s.searchers {
searcher.SetQueryNorm(qnorm)
}
}
func (s *ConjunctionSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
if !s.initialized {
err := s.initSearchers(ctx)
if err != nil {
return nil, err
}
}
var rv *search.DocumentMatch
var err error
OUTER:
for s.currs[s.maxIDIdx] != nil {
maxID := s.currs[s.maxIDIdx].IndexInternalID
i := 0
for i < len(s.currs) {
if s.currs[i] == nil {
return nil, nil
}
if i == s.maxIDIdx {
i++
continue
}
cmp := maxID.Compare(s.currs[i].IndexInternalID)
if cmp == 0 {
i++
continue
}
if cmp < 0 {
// maxID < currs[i], so we found a new maxIDIdx
s.maxIDIdx = i
// advance the positions where [0 <= x < i], since we
// know they were equal to the former max entry
maxID = s.currs[s.maxIDIdx].IndexInternalID
for x := 0; x < i; x++ {
err = s.advanceChild(ctx, x, maxID)
if err != nil {
return nil, err
}
}
continue OUTER
}
// maxID > currs[i], so need to advance searchers[i]
err = s.advanceChild(ctx, i, maxID)
if err != nil {
return nil, err
}
// don't bump i, so that we'll examine the just-advanced
// currs[i] again
}
// if we get here, a doc matched all readers, so score and add it
rv = s.scorer.Score(ctx, s.currs)
// we know all the searchers are pointing at the same thing
// so they all need to be bumped
for i, termSearcher := range s.searchers {
if s.currs[i] != rv {
ctx.DocumentMatchPool.Put(s.currs[i])
}
s.currs[i], err = termSearcher.Next(ctx)
if err != nil {
return nil, err
}
}
// don't continue now, wait for the next call to Next()
break
}
return rv, nil
}
func (s *ConjunctionSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
if !s.initialized {
err := s.initSearchers(ctx)
if err != nil {
return nil, err
}
}
for i := range s.searchers {
err := s.advanceChild(ctx, i, ID)
if err != nil {
return nil, err
}
}
return s.Next(ctx)
}
func (s *ConjunctionSearcher) advanceChild(ctx *search.SearchContext, i int, ID index.IndexInternalID) (err error) {
if s.currs[i] != nil {
ctx.DocumentMatchPool.Put(s.currs[i])
}
s.currs[i], err = s.searchers[i].Advance(ctx, ID)
return err
}
func (s *ConjunctionSearcher) Count() uint64 {
// for now return a worst case
var sum uint64
for _, searcher := range s.searchers {
sum += searcher.Count()
}
return sum
}
func (s *ConjunctionSearcher) Close() (rv error) {
for _, searcher := range s.searchers {
err := searcher.Close()
if err != nil && rv == nil {
rv = err
}
}
return rv
}
func (s *ConjunctionSearcher) Min() int {
return 0
}
func (s *ConjunctionSearcher) DocumentMatchPoolSize() int {
rv := len(s.currs)
for _, s := range s.searchers {
rv += s.DocumentMatchPoolSize()
}
return rv
}
|
