/
search_multi_term.go
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/
search_multi_term.go
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// Copyright (c) 2017 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 (
"fmt"
"github.com/blevesearch/bleve/v2/search"
index "github.com/blevesearch/bleve_index_api"
)
func NewMultiTermSearcher(indexReader index.IndexReader, terms []string,
field string, boost float64, options search.SearcherOptions, limit bool) (
search.Searcher, error) {
if tooManyClauses(len(terms)) {
if optionsDisjunctionOptimizable(options) {
return optimizeMultiTermSearcher(indexReader, terms, field, boost, options)
}
if limit {
return nil, tooManyClausesErr(field, len(terms))
}
}
qsearchers, err := makeBatchSearchers(indexReader, terms, field, boost, options)
if err != nil {
return nil, err
}
// build disjunction searcher of these ranges
return newMultiTermSearcherInternal(indexReader, qsearchers, field, boost,
options, limit)
}
func NewMultiTermSearcherBytes(indexReader index.IndexReader, terms [][]byte,
field string, boost float64, options search.SearcherOptions, limit bool) (
search.Searcher, error) {
if tooManyClauses(len(terms)) {
if optionsDisjunctionOptimizable(options) {
return optimizeMultiTermSearcherBytes(indexReader, terms, field, boost, options)
}
if limit {
return nil, tooManyClausesErr(field, len(terms))
}
}
qsearchers, err := makeBatchSearchersBytes(indexReader, terms, field, boost, options)
if err != nil {
return nil, err
}
// build disjunction searcher of these ranges
return newMultiTermSearcherInternal(indexReader, qsearchers, field, boost,
options, limit)
}
func newMultiTermSearcherInternal(indexReader index.IndexReader,
searchers []search.Searcher, field string, boost float64,
options search.SearcherOptions, limit bool) (
search.Searcher, error) {
// build disjunction searcher of these ranges
searcher, err := newDisjunctionSearcher(indexReader, searchers, 0, options,
limit)
if err != nil {
for _, s := range searchers {
_ = s.Close()
}
return nil, err
}
return searcher, nil
}
func optimizeMultiTermSearcher(indexReader index.IndexReader, terms []string,
field string, boost float64, options search.SearcherOptions) (
search.Searcher, error) {
var finalSearcher search.Searcher
for len(terms) > 0 {
var batchTerms []string
if len(terms) > DisjunctionMaxClauseCount {
batchTerms = terms[:DisjunctionMaxClauseCount]
terms = terms[DisjunctionMaxClauseCount:]
} else {
batchTerms = terms
terms = nil
}
batch, err := makeBatchSearchers(indexReader, batchTerms, field, boost, options)
if err != nil {
return nil, err
}
if finalSearcher != nil {
batch = append(batch, finalSearcher)
}
cleanup := func() {
for _, searcher := range batch {
if searcher != nil {
_ = searcher.Close()
}
}
}
finalSearcher, err = optimizeCompositeSearcher("disjunction:unadorned",
indexReader, batch, options)
// all searchers in batch should be closed, regardless of error or optimization failure
// either we're returning, or continuing and only finalSearcher is needed for next loop
cleanup()
if err != nil {
return nil, err
}
if finalSearcher == nil {
return nil, fmt.Errorf("unable to optimize")
}
}
return finalSearcher, nil
}
func makeBatchSearchers(indexReader index.IndexReader, terms []string, field string,
boost float64, options search.SearcherOptions) ([]search.Searcher, error) {
qsearchers := make([]search.Searcher, len(terms))
qsearchersClose := func() {
for _, searcher := range qsearchers {
if searcher != nil {
_ = searcher.Close()
}
}
}
for i, term := range terms {
var err error
qsearchers[i], err = NewTermSearcher(indexReader, term, field, boost, options)
if err != nil {
qsearchersClose()
return nil, err
}
}
return qsearchers, nil
}
func optimizeMultiTermSearcherBytes(indexReader index.IndexReader, terms [][]byte,
field string, boost float64, options search.SearcherOptions) (
search.Searcher, error) {
var finalSearcher search.Searcher
for len(terms) > 0 {
var batchTerms [][]byte
if len(terms) > DisjunctionMaxClauseCount {
batchTerms = terms[:DisjunctionMaxClauseCount]
terms = terms[DisjunctionMaxClauseCount:]
} else {
batchTerms = terms
terms = nil
}
batch, err := makeBatchSearchersBytes(indexReader, batchTerms, field, boost, options)
if err != nil {
return nil, err
}
if finalSearcher != nil {
batch = append(batch, finalSearcher)
}
cleanup := func() {
for _, searcher := range batch {
if searcher != nil {
_ = searcher.Close()
}
}
}
finalSearcher, err = optimizeCompositeSearcher("disjunction:unadorned",
indexReader, batch, options)
// all searchers in batch should be closed, regardless of error or optimization failure
// either we're returning, or continuing and only finalSearcher is needed for next loop
cleanup()
if err != nil {
return nil, err
}
if finalSearcher == nil {
return nil, fmt.Errorf("unable to optimize")
}
}
return finalSearcher, nil
}
func makeBatchSearchersBytes(indexReader index.IndexReader, terms [][]byte, field string,
boost float64, options search.SearcherOptions) ([]search.Searcher, error) {
qsearchers := make([]search.Searcher, len(terms))
qsearchersClose := func() {
for _, searcher := range qsearchers {
if searcher != nil {
_ = searcher.Close()
}
}
}
for i, term := range terms {
var err error
qsearchers[i], err = NewTermSearcherBytes(indexReader, term, field, boost, options)
if err != nil {
qsearchersClose()
return nil, err
}
}
return qsearchers, nil
}