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segment.go
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segment.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 mem
import (
"fmt"
"github.com/RoaringBitmap/roaring"
"github.com/blevesearch/bleve/index/scorch/segment"
)
// _id field is always guaranteed to have fieldID of 0
const idFieldID uint16 = 0
// KNOWN ISSUES
// - LIMITATION - we decided whether or not to store term vectors for a field
// at the segment level, based on the first definition of a
// field we see. in normal bleve usage this is fine, all
// instances of a field definition will be the same. however,
// advanced users may violate this and provide unique field
// definitions with each document. this segment does not
// support this usage.
// TODO
// - need better testing of multiple docs, iterating freqs, locations and
// and verifying the correct results are returned
// Segment is an in memory implementation of scorch.Segment
type Segment struct {
// FieldsMap adds 1 to field id to avoid zero value issues
// name -> field id + 1
FieldsMap map[string]uint16
// FieldsInv is the inverse of FieldsMap
// field id -> name
FieldsInv []string
// Term dictionaries for each field
// field id -> term -> postings list id + 1
Dicts []map[string]uint64
// Terms for each field, where terms are sorted ascending
// field id -> []term
DictKeys [][]string
// Postings list
// postings list id -> bitmap by docNum
Postings []*roaring.Bitmap
// Postings list has locations
PostingsLocs []*roaring.Bitmap
// Term frequencies
// postings list id -> Freqs (one for each hit in bitmap)
Freqs [][]uint64
// Field norms
// postings list id -> Norms (one for each hit in bitmap)
Norms [][]float32
// Field/start/end/pos/locarraypos
// postings list id -> start/end/pos/locarraypos (one for each freq)
Locfields [][]uint16
Locstarts [][]uint64
Locends [][]uint64
Locpos [][]uint64
Locarraypos [][][]uint64
// Stored field values
// docNum -> field id -> slice of values (each value []byte)
Stored []map[uint16][][]byte
// Stored field types
// docNum -> field id -> slice of types (each type byte)
StoredTypes []map[uint16][]byte
// Stored field array positions
// docNum -> field id -> slice of array positions (each is []uint64)
StoredPos []map[uint16][][]uint64
// For storing the docValue persisted fields
DocValueFields map[uint16]bool
// Footprint of the segment, updated when analyzed document mutations
// are added into the segment
sizeInBytes uint64
}
// New builds a new empty Segment
func New() *Segment {
return &Segment{
FieldsMap: map[string]uint16{},
DocValueFields: map[uint16]bool{},
}
}
func (s *Segment) updateSizeInBytes() {
var sizeInBytes uint64
// FieldsMap, FieldsInv
for k, _ := range s.FieldsMap {
sizeInBytes += uint64((len(k)+int(segment.SizeOfString))*2 +
2 /* size of uint16 */)
}
// overhead from the data structures
sizeInBytes += (segment.SizeOfMap + segment.SizeOfSlice)
// Dicts, DictKeys
for _, entry := range s.Dicts {
for k, _ := range entry {
sizeInBytes += uint64((len(k)+int(segment.SizeOfString))*2 +
8 /* size of uint64 */)
}
// overhead from the data structures
sizeInBytes += (segment.SizeOfMap + segment.SizeOfSlice)
}
sizeInBytes += (segment.SizeOfSlice * 2)
// Postings, PostingsLocs
for i := 0; i < len(s.Postings); i++ {
sizeInBytes += (s.Postings[i].GetSizeInBytes() + segment.SizeOfPointer) +
(s.PostingsLocs[i].GetSizeInBytes() + segment.SizeOfPointer)
}
sizeInBytes += (segment.SizeOfSlice * 2)
// Freqs, Norms
for i := 0; i < len(s.Freqs); i++ {
sizeInBytes += uint64(len(s.Freqs[i])*8 /* size of uint64 */ +
len(s.Norms[i])*4 /* size of float32 */) +
(segment.SizeOfSlice * 2)
}
sizeInBytes += (segment.SizeOfSlice * 2)
// Location data
for i := 0; i < len(s.Locfields); i++ {
sizeInBytes += uint64(len(s.Locfields[i])*2 /* size of uint16 */ +
len(s.Locstarts[i])*8 /* size of uint64 */ +
len(s.Locends[i])*8 /* size of uint64 */ +
len(s.Locpos[i])*8 /* size of uint64 */)
for j := 0; j < len(s.Locarraypos[i]); j++ {
sizeInBytes += uint64(len(s.Locarraypos[i][j])*8 /* size of uint64 */) +
segment.SizeOfSlice
}
sizeInBytes += (segment.SizeOfSlice * 5)
}
sizeInBytes += (segment.SizeOfSlice * 5)
// Stored data
for i := 0; i < len(s.Stored); i++ {
for _, v := range s.Stored[i] {
sizeInBytes += uint64(2 /* size of uint16 */)
for _, arr := range v {
sizeInBytes += uint64(len(arr)) + segment.SizeOfSlice
}
sizeInBytes += segment.SizeOfSlice
}
for _, v := range s.StoredTypes[i] {
sizeInBytes += uint64(2 /* size of uint16 */ +len(v)) + segment.SizeOfSlice
}
for _, v := range s.StoredPos[i] {
sizeInBytes += uint64(2 /* size of uint16 */)
for _, arr := range v {
sizeInBytes += uint64(len(arr)*8 /* size of uint64 */) +
segment.SizeOfSlice
}
sizeInBytes += segment.SizeOfSlice
}
// overhead from map(s) within Stored, StoredTypes, StoredPos
sizeInBytes += (segment.SizeOfMap * 3)
}
// overhead from data structures: Stored, StoredTypes, StoredPos
sizeInBytes += (segment.SizeOfSlice * 3)
// DocValueFields
sizeInBytes += uint64(len(s.DocValueFields)*3 /* size of uint16 + bool */) +
segment.SizeOfMap
// SizeInBytes
sizeInBytes += uint64(8)
s.sizeInBytes = sizeInBytes
}
func (s *Segment) SizeInBytes() uint64 {
return s.sizeInBytes
}
func (s *Segment) AddRef() {
}
func (s *Segment) DecRef() error {
return nil
}
// Fields returns the field names used in this segment
func (s *Segment) Fields() []string {
return s.FieldsInv
}
// VisitDocument invokes the DocFieldValueVistor for each stored field
// for the specified doc number
func (s *Segment) VisitDocument(num uint64, visitor segment.DocumentFieldValueVisitor) error {
// ensure document number exists
if int(num) > len(s.Stored)-1 {
return nil
}
docFields := s.Stored[int(num)]
st := s.StoredTypes[int(num)]
sp := s.StoredPos[int(num)]
for field, values := range docFields {
for i, value := range values {
keepGoing := visitor(s.FieldsInv[field], st[field][i], value, sp[field][i])
if !keepGoing {
return nil
}
}
}
return nil
}
func (s *Segment) getField(name string) (int, error) {
fieldID, ok := s.FieldsMap[name]
if !ok {
return 0, fmt.Errorf("no field named %s", name)
}
return int(fieldID - 1), nil
}
// Dictionary returns the term dictionary for the specified field
func (s *Segment) Dictionary(field string) (segment.TermDictionary, error) {
fieldID, err := s.getField(field)
if err != nil {
// no such field, return empty dictionary
return &segment.EmptyDictionary{}, nil
}
return &Dictionary{
segment: s,
field: field,
fieldID: uint16(fieldID),
}, nil
}
// Count returns the number of documents in this segment
// (this has no notion of deleted docs)
func (s *Segment) Count() uint64 {
return uint64(len(s.Stored))
}
// DocNumbers returns a bitset corresponding to the doc numbers of all the
// provided _id strings
func (s *Segment) DocNumbers(ids []string) (*roaring.Bitmap, error) {
rv := roaring.New()
// guard against empty segment
if len(s.FieldsMap) > 0 {
idDictionary := s.Dicts[idFieldID]
for _, id := range ids {
postingID := idDictionary[id]
if postingID > 0 {
rv.Or(s.Postings[postingID-1])
}
}
}
return rv, nil
}
// Close releases all resources associated with this segment
func (s *Segment) Close() error {
return nil
}