forked from blevesearch/bleve
/
optimize.go
93 lines (73 loc) · 2.08 KB
/
optimize.go
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// Copyright (c) 2018 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 scorch
import (
"fmt"
"github.com/RoaringBitmap/roaring"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/index/scorch/segment/zap"
)
func (s *IndexSnapshotTermFieldReader) Optimize(kind string, octx index.OptimizableContext) (
index.OptimizableContext, error) {
if kind != "conjunction" {
return octx, nil
}
if octx == nil {
octx = &OptimizeTFRConjunction{snapshot: s.snapshot}
}
o, ok := octx.(*OptimizeTFRConjunction)
if !ok {
return octx, nil
}
if o.snapshot != s.snapshot {
return nil, fmt.Errorf("tried to optimize across different snapshots")
}
o.tfrs = append(o.tfrs, s)
return o, nil
}
type OptimizeTFRConjunction struct {
snapshot *IndexSnapshot
tfrs []*IndexSnapshotTermFieldReader
}
func (o *OptimizeTFRConjunction) Finish() error {
if len(o.tfrs) <= 1 {
return nil
}
for i := range o.snapshot.segment {
itr0, ok := o.tfrs[0].iterators[i].(*zap.PostingsIterator)
if !ok || itr0.ActualBM == nil {
continue
}
itr1, ok := o.tfrs[1].iterators[i].(*zap.PostingsIterator)
if !ok || itr1.ActualBM == nil {
continue
}
bm := roaring.And(itr0.ActualBM, itr1.ActualBM)
for _, tfr := range o.tfrs[2:] {
itr, ok := tfr.iterators[i].(*zap.PostingsIterator)
if !ok || itr.ActualBM == nil {
continue
}
bm.And(itr.ActualBM)
}
for _, tfr := range o.tfrs {
itr, ok := tfr.iterators[i].(*zap.PostingsIterator)
if ok && itr.ActualBM != nil {
itr.ActualBM = bm
itr.Actual = bm.Iterator()
}
}
}
return nil
}