251 lines
8.0 KiB
Go
251 lines
8.0 KiB
Go
// Copyright (c) 2017 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mem
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import (
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"math"
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"sort"
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"github.com/RoaringBitmap/roaring"
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/document"
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"github.com/blevesearch/bleve/index"
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)
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// NewFromAnalyzedDocs places the analyzed document mutations into this segment
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func NewFromAnalyzedDocs(results []*index.AnalysisResult) *Segment {
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s := New()
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// ensure that _id field get fieldID 0
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s.getOrDefineField("_id")
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// walk each doc
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for _, result := range results {
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s.processDocument(result)
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}
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// go back and sort the dictKeys
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for _, dict := range s.DictKeys {
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sort.Strings(dict)
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}
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// compute memory usage of segment
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s.updateSizeInBytes()
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// professional debugging
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//
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// log.Printf("fields: %v\n", s.FieldsMap)
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// log.Printf("fieldsInv: %v\n", s.FieldsInv)
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// log.Printf("fieldsLoc: %v\n", s.FieldsLoc)
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// log.Printf("dicts: %v\n", s.Dicts)
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// log.Printf("dict keys: %v\n", s.DictKeys)
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// for i, posting := range s.Postings {
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// log.Printf("posting %d: %v\n", i, posting)
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// }
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// for i, freq := range s.Freqs {
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// log.Printf("freq %d: %v\n", i, freq)
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// }
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// for i, norm := range s.Norms {
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// log.Printf("norm %d: %v\n", i, norm)
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// }
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// for i, field := range s.Locfields {
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// log.Printf("field %d: %v\n", i, field)
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// }
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// for i, start := range s.Locstarts {
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// log.Printf("start %d: %v\n", i, start)
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// }
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// for i, end := range s.Locends {
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// log.Printf("end %d: %v\n", i, end)
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// }
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// for i, pos := range s.Locpos {
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// log.Printf("pos %d: %v\n", i, pos)
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// }
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// for i, apos := range s.Locarraypos {
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// log.Printf("apos %d: %v\n", i, apos)
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// }
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// log.Printf("stored: %v\n", s.Stored)
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// log.Printf("stored types: %v\n", s.StoredTypes)
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// log.Printf("stored pos: %v\n", s.StoredPos)
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return s
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}
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func (s *Segment) processDocument(result *index.AnalysisResult) {
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// used to collate information across fields
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docMap := map[uint16]analysis.TokenFrequencies{}
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fieldLens := map[uint16]int{}
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docNum := uint64(s.addDocument())
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processField := func(field uint16, name string, l int, tf analysis.TokenFrequencies) {
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fieldLens[field] += l
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if existingFreqs, ok := docMap[field]; ok {
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existingFreqs.MergeAll(name, tf)
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} else {
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docMap[field] = tf
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}
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}
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storeField := func(docNum uint64, field uint16, typ byte, val []byte, pos []uint64) {
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s.Stored[docNum][field] = append(s.Stored[docNum][field], val)
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s.StoredTypes[docNum][field] = append(s.StoredTypes[docNum][field], typ)
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s.StoredPos[docNum][field] = append(s.StoredPos[docNum][field], pos)
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}
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// walk each composite field
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for _, field := range result.Document.CompositeFields {
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fieldID := uint16(s.getOrDefineField(field.Name()))
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l, tf := field.Analyze()
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processField(fieldID, field.Name(), l, tf)
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}
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// walk each field
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for i, field := range result.Document.Fields {
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fieldID := uint16(s.getOrDefineField(field.Name()))
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l := result.Length[i]
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tf := result.Analyzed[i]
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processField(fieldID, field.Name(), l, tf)
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if field.Options().IsStored() {
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storeField(docNum, fieldID, encodeFieldType(field), field.Value(), field.ArrayPositions())
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}
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if field.Options().IncludeDocValues() {
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s.DocValueFields[fieldID] = true
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}
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}
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// now that its been rolled up into docMap, walk that
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for fieldID, tokenFrequencies := range docMap {
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for term, tokenFreq := range tokenFrequencies {
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fieldTermPostings := s.Dicts[fieldID][term]
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// FIXME this if/else block has duplicate code that has resulted in
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// bugs fixed/missed more than once, need to refactor
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if fieldTermPostings == 0 {
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// need to build new posting
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bs := roaring.New()
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bs.AddInt(int(docNum))
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newPostingID := uint64(len(s.Postings) + 1)
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// add this new bitset to the postings slice
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s.Postings = append(s.Postings, bs)
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locationBS := roaring.New()
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s.PostingsLocs = append(s.PostingsLocs, locationBS)
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// add this to the details slice
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s.Freqs = append(s.Freqs, []uint64{uint64(tokenFreq.Frequency())})
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s.Norms = append(s.Norms, []float32{float32(1.0 / math.Sqrt(float64(fieldLens[fieldID])))})
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// add to locations
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var locfields []uint16
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var locstarts []uint64
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var locends []uint64
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var locpos []uint64
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var locarraypos [][]uint64
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if len(tokenFreq.Locations) > 0 {
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locationBS.AddInt(int(docNum))
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}
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for _, loc := range tokenFreq.Locations {
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var locf = fieldID
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if loc.Field != "" {
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locf = uint16(s.getOrDefineField(loc.Field))
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}
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locfields = append(locfields, locf)
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locstarts = append(locstarts, uint64(loc.Start))
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locends = append(locends, uint64(loc.End))
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locpos = append(locpos, uint64(loc.Position))
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if len(loc.ArrayPositions) > 0 {
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locarraypos = append(locarraypos, loc.ArrayPositions)
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} else {
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locarraypos = append(locarraypos, nil)
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}
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}
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s.Locfields = append(s.Locfields, locfields)
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s.Locstarts = append(s.Locstarts, locstarts)
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s.Locends = append(s.Locends, locends)
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s.Locpos = append(s.Locpos, locpos)
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s.Locarraypos = append(s.Locarraypos, locarraypos)
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// record it
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s.Dicts[fieldID][term] = newPostingID
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// this term was new for this field, add it to dictKeys
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s.DictKeys[fieldID] = append(s.DictKeys[fieldID], term)
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} else {
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// posting already started for this field/term
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// the actual offset is - 1, because 0 is zero value
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bs := s.Postings[fieldTermPostings-1]
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bs.AddInt(int(docNum))
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locationBS := s.PostingsLocs[fieldTermPostings-1]
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s.Freqs[fieldTermPostings-1] = append(s.Freqs[fieldTermPostings-1], uint64(tokenFreq.Frequency()))
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s.Norms[fieldTermPostings-1] = append(s.Norms[fieldTermPostings-1], float32(1.0/math.Sqrt(float64(fieldLens[fieldID]))))
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if len(tokenFreq.Locations) > 0 {
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locationBS.AddInt(int(docNum))
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}
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for _, loc := range tokenFreq.Locations {
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var locf = fieldID
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if loc.Field != "" {
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locf = uint16(s.getOrDefineField(loc.Field))
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}
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s.Locfields[fieldTermPostings-1] = append(s.Locfields[fieldTermPostings-1], locf)
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s.Locstarts[fieldTermPostings-1] = append(s.Locstarts[fieldTermPostings-1], uint64(loc.Start))
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s.Locends[fieldTermPostings-1] = append(s.Locends[fieldTermPostings-1], uint64(loc.End))
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s.Locpos[fieldTermPostings-1] = append(s.Locpos[fieldTermPostings-1], uint64(loc.Position))
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if len(loc.ArrayPositions) > 0 {
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s.Locarraypos[fieldTermPostings-1] = append(s.Locarraypos[fieldTermPostings-1], loc.ArrayPositions)
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} else {
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s.Locarraypos[fieldTermPostings-1] = append(s.Locarraypos[fieldTermPostings-1], nil)
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}
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}
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}
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}
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}
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}
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func (s *Segment) getOrDefineField(name string) int {
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fieldID, ok := s.FieldsMap[name]
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if !ok {
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fieldID = uint16(len(s.FieldsInv) + 1)
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s.FieldsMap[name] = fieldID
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s.FieldsInv = append(s.FieldsInv, name)
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s.Dicts = append(s.Dicts, make(map[string]uint64))
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s.DictKeys = append(s.DictKeys, make([]string, 0))
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}
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return int(fieldID - 1)
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}
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func (s *Segment) addDocument() int {
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docNum := len(s.Stored)
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s.Stored = append(s.Stored, map[uint16][][]byte{})
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s.StoredTypes = append(s.StoredTypes, map[uint16][]byte{})
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s.StoredPos = append(s.StoredPos, map[uint16][][]uint64{})
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return docNum
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}
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func encodeFieldType(f document.Field) byte {
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fieldType := byte('x')
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switch f.(type) {
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case *document.TextField:
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fieldType = 't'
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case *document.NumericField:
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fieldType = 'n'
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case *document.DateTimeField:
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fieldType = 'd'
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case *document.BooleanField:
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fieldType = 'b'
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case *document.GeoPointField:
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fieldType = 'g'
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case *document.CompositeField:
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fieldType = 'c'
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}
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return fieldType
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}
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