3fd2a64872
The DumpXXX() methods were always documented as internal and unsupported. However, now they are being removed from the public top-level API. They are still available on the internal IndexReader, which can be accessed using the Advanced() method. The DocCount() and DumpXXX() methods on the internal index have moved to the internal index reader, since they logically operate on a snapshot of an index.
249 lines
6.4 KiB
Go
249 lines
6.4 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 smolder
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import (
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"fmt"
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"github.com/blevesearch/bleve/document"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/index/store"
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)
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type IndexReader struct {
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index *SmolderingCouch
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kvreader store.KVReader
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docCount uint64
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}
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func (i *IndexReader) TermFieldReader(term []byte, fieldName string, includeFreq, includeNorm, includeTermVectors bool) (index.TermFieldReader, error) {
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fieldIndex, fieldExists := i.index.fieldCache.FieldNamed(fieldName, false)
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if fieldExists {
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return newSmolderingCouchTermFieldReader(i, term, uint16(fieldIndex), includeFreq, includeNorm, includeTermVectors)
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}
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return newSmolderingCouchTermFieldReader(i, []byte{ByteSeparator}, ^uint16(0), includeFreq, includeNorm, includeTermVectors)
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}
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func (i *IndexReader) FieldDict(fieldName string) (index.FieldDict, error) {
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return i.FieldDictRange(fieldName, nil, nil)
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}
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func (i *IndexReader) FieldDictRange(fieldName string, startTerm []byte, endTerm []byte) (index.FieldDict, error) {
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fieldIndex, fieldExists := i.index.fieldCache.FieldNamed(fieldName, false)
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if fieldExists {
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return newSmolderingCouchFieldDict(i, uint16(fieldIndex), startTerm, endTerm)
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}
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return newSmolderingCouchFieldDict(i, ^uint16(0), []byte{ByteSeparator}, []byte{})
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}
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func (i *IndexReader) FieldDictPrefix(fieldName string, termPrefix []byte) (index.FieldDict, error) {
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return i.FieldDictRange(fieldName, termPrefix, termPrefix)
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}
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func (i *IndexReader) DocIDReaderAll() (index.DocIDReader, error) {
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return newSmolderingCouchDocIDReader(i)
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}
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func (i *IndexReader) DocIDReaderOnly(ids []string) (index.DocIDReader, error) {
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return newSmolderingCouchDocIDReaderOnly(i, ids)
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}
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func (i *IndexReader) Document(id string) (doc *document.Document, err error) {
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// first hit the back index to confirm doc exists
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var backIndexRow *BackIndexRow
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backIndexRow, err = i.backIndexRowForDoc(nil, id)
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if err != nil {
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return
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}
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if backIndexRow == nil {
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return
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}
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doc = document.NewDocument(id)
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storedRowScanPrefix := NewStoredRowDocBytes(backIndexRow.docNumber, 0, []uint64{}, 'x', nil).ScanPrefixForDoc()
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it := i.kvreader.PrefixIterator(storedRowScanPrefix)
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defer func() {
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if cerr := it.Close(); err == nil && cerr != nil {
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err = cerr
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}
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}()
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key, val, valid := it.Current()
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for valid {
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safeVal := make([]byte, len(val))
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copy(safeVal, val)
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var row *StoredRow
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row, err = NewStoredRowKV(key, safeVal)
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if err != nil {
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doc = nil
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return
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}
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if row != nil {
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fieldName := i.index.fieldCache.FieldIndexed(row.field)
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field := decodeFieldType(row.typ, fieldName, row.arrayPositions, row.value)
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if field != nil {
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doc.AddField(field)
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}
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}
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it.Next()
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key, val, valid = it.Current()
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}
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return
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}
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func (i *IndexReader) DocumentFieldTerms(id index.IndexInternalID, fields []string) (index.FieldTerms, error) {
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back, err := i.backIndexRowForDoc(id, "")
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if err != nil {
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return nil, err
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}
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if back == nil {
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return nil, nil
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}
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rv := make(index.FieldTerms, len(fields))
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fieldsMap := make(map[uint16]string, len(fields))
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for _, f := range fields {
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id, ok := i.index.fieldCache.FieldNamed(f, false)
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if !ok {
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return nil, fmt.Errorf("Field %s was not found in cache", f)
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}
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fieldsMap[id] = f
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}
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for _, entry := range back.termsEntries {
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if field, ok := fieldsMap[uint16(*entry.Field)]; ok {
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rv[field] = entry.Terms
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}
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}
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return rv, nil
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}
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func (i *IndexReader) Fields() (fields []string, err error) {
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fields = make([]string, 0)
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it := i.kvreader.PrefixIterator([]byte{'f'})
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defer func() {
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if cerr := it.Close(); err == nil && cerr != nil {
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err = cerr
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}
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}()
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key, val, valid := it.Current()
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for valid {
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var row SmolderingCouchRow
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row, err = ParseFromKeyValue(key, val)
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if err != nil {
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fields = nil
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return
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}
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if row != nil {
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fieldRow, ok := row.(*FieldRow)
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if ok {
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fields = append(fields, fieldRow.name)
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}
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}
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it.Next()
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key, val, valid = it.Current()
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}
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return
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}
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func (i *IndexReader) GetInternal(key []byte) ([]byte, error) {
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internalRow := NewInternalRow(key, nil)
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return i.kvreader.Get(internalRow.Key())
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}
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func (i *IndexReader) DocCount() (uint64, error) {
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return i.docCount, nil
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}
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func (i *IndexReader) Close() error {
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return i.kvreader.Close()
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}
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func (i *IndexReader) ExternalID(id index.IndexInternalID) (string, error) {
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k := StoredRowDocFieldKey(id, 0)
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v, err := i.kvreader.Get(k)
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if err != nil {
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return "", err
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}
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return string(v[1:]), nil
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}
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func (i *IndexReader) InternalID(id string) (index.IndexInternalID, error) {
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tfr, err := i.TermFieldReader([]byte(id), "_id", false, false, false)
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if err != nil {
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return nil, err
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}
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if tfr.Count() < 1 {
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return nil, nil
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}
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pre := index.TermFieldDoc{}
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tfd, err := tfr.Next(&pre)
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if err != nil {
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return nil, err
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}
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return tfd.ID, nil
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}
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func (i *IndexReader) backIndexRowForDoc(docID index.IndexInternalID, externalDocID string) (*BackIndexRow, error) {
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var err error
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// first look up the docID if it isn't known
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if docID == nil {
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// first get the internal identifier
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docID, err = i.InternalID(externalDocID)
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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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if len(docID) < 1 {
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return nil, nil
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}
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// use a temporary row structure to build key
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tempRow := &BackIndexRow{
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docNumber: docID,
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}
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keyBuf := GetRowBuffer()
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if tempRow.KeySize() > len(keyBuf) {
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keyBuf = make([]byte, 2*tempRow.KeySize())
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}
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defer PutRowBuffer(keyBuf)
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keySize, err := tempRow.KeyTo(keyBuf)
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if err != nil {
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return nil, err
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}
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value, err := i.kvreader.Get(keyBuf[:keySize])
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if err != nil {
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return nil, err
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}
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if value == nil {
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return nil, nil
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}
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backIndexRow, err := NewBackIndexRowKV(keyBuf[:keySize], value)
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if err != nil {
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return nil, err
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}
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return backIndexRow, nil
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}
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func incrementBytes(in []byte) []byte {
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rv := make([]byte, len(in))
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copy(rv, in)
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for i := len(rv) - 1; i >= 0; i-- {
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rv[i] = rv[i] + 1
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if rv[i] != 0 {
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// didn't overflow, so stop
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break
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}
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}
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return rv
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}
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