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segment_roaring_set_strategy.go
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segment_roaring_set_strategy.go
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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: hello@weaviate.io
//
package lsmkv
import (
"fmt"
"github.com/weaviate/weaviate/adapters/repos/db/lsmkv/segmentindex"
"github.com/weaviate/weaviate/adapters/repos/db/roaringset"
"github.com/weaviate/weaviate/entities/lsmkv"
)
func (s *segment) roaringSetGet(key []byte) (roaringset.BitmapLayer, error) {
out := roaringset.BitmapLayer{}
if s.strategy != segmentindex.StrategyRoaringSet {
return out, fmt.Errorf("need strategy %s", StrategyRoaringSet)
}
if s.useBloomFilter && !s.bloomFilter.Test(key) {
return out, lsmkv.NotFound
}
node, err := s.index.Get(key)
if err != nil {
return out, err
}
sn, err := s.segmentNodeFromBuffer(nodeOffset{node.Start, node.End})
if err != nil {
return out, err
}
// make sure that any data is copied before exiting this method, otherwise we
// risk a SEGFAULT as described in
// https://github.com/weaviate/weaviate/issues/1837
out.Additions = sn.AdditionsWithCopy()
out.Deletions = sn.DeletionsWithCopy()
return out, nil
}
func (s *segment) segmentNodeFromBuffer(offset nodeOffset) (*roaringset.SegmentNode, error) {
var contents []byte
if s.mmapContents {
contents = s.contents[offset.start:offset.end]
} else {
contents = make([]byte, offset.end-offset.start)
r, err := s.bufferedReaderAt(offset.start)
if err != nil {
return nil, err
}
_, err = r.Read(contents)
if err != nil {
return nil, err
}
}
return roaringset.NewSegmentNodeFromBuffer(contents), nil
}