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pk_statistics.go
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/
pk_statistics.go
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// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 storage
import (
"fmt"
"github.com/bits-and-blooms/bloom/v3"
"github.com/cockroachdb/errors"
"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
"github.com/milvus-io/milvus/pkg/common"
)
// pkStatistics contains pk field statistic information
type PkStatistics struct {
PkFilter *bloom.BloomFilter // bloom filter of pk inside a segment
MinPK PrimaryKey // minimal pk value, shortcut for checking whether a pk is inside this segment
MaxPK PrimaryKey // maximal pk value, same above
}
// update set pk min/max value if input value is beyond former range.
func (st *PkStatistics) UpdateMinMax(pk PrimaryKey) error {
if st == nil {
return errors.New("nil pk statistics")
}
if st.MinPK == nil {
st.MinPK = pk
} else if st.MinPK.GT(pk) {
st.MinPK = pk
}
if st.MaxPK == nil {
st.MaxPK = pk
} else if st.MaxPK.LT(pk) {
st.MaxPK = pk
}
return nil
}
func (st *PkStatistics) UpdatePKRange(ids FieldData) error {
switch pks := ids.(type) {
case *Int64FieldData:
buf := make([]byte, 8)
for _, pk := range pks.Data {
id := NewInt64PrimaryKey(pk)
err := st.UpdateMinMax(id)
if err != nil {
return err
}
common.Endian.PutUint64(buf, uint64(pk))
st.PkFilter.Add(buf)
}
case *StringFieldData:
for _, pk := range pks.Data {
id := NewVarCharPrimaryKey(pk)
err := st.UpdateMinMax(id)
if err != nil {
return err
}
st.PkFilter.AddString(pk)
}
default:
return fmt.Errorf("invalid data type for primary key: %T", ids)
}
return nil
}
func (st *PkStatistics) PkExist(pk PrimaryKey) bool {
// empty pkStatics
if st.MinPK == nil || st.MaxPK == nil || st.PkFilter == nil {
return false
}
// check pk range first, ugly but key it for now
if st.MinPK.GT(pk) || st.MaxPK.LT(pk) {
return false
}
// if in range, check bloom filter
switch pk.Type() {
case schemapb.DataType_Int64:
buf := make([]byte, 8)
int64Pk := pk.(*Int64PrimaryKey)
common.Endian.PutUint64(buf, uint64(int64Pk.Value))
return st.PkFilter.Test(buf)
case schemapb.DataType_VarChar:
varCharPk := pk.(*VarCharPrimaryKey)
return st.PkFilter.TestString(varCharPk.Value)
default:
// TODO::
}
// no idea, just make it as false positive
return true
}
// Locations returns a list of hash locations representing a data item.
func Locations(pk PrimaryKey, k uint) []uint64 {
switch pk.Type() {
case schemapb.DataType_Int64:
buf := make([]byte, 8)
int64Pk := pk.(*Int64PrimaryKey)
common.Endian.PutUint64(buf, uint64(int64Pk.Value))
return bloom.Locations(buf, k)
case schemapb.DataType_VarChar:
varCharPk := pk.(*VarCharPrimaryKey)
return bloom.Locations([]byte(varCharPk.Value), k)
default:
// TODO::
}
return nil
}
func (st *PkStatistics) TestLocations(pk PrimaryKey, locs []uint64) bool {
// empty pkStatics
if st.MinPK == nil || st.MaxPK == nil || st.PkFilter == nil {
return false
}
// check bf first, TestLocation just do some bitset compute, cost is cheaper
if !st.PkFilter.TestLocations(locs) {
return false
}
// check pk range first, ugly but key it for now
return st.MinPK.LE(pk) && st.MaxPK.GE(pk)
}
func (st *PkStatistics) TestLocationCache(lc LocationsCache) bool {
// empty pkStatics
if st.MinPK == nil || st.MaxPK == nil || st.PkFilter == nil {
return false
}
// check bf first, TestLocation just do some bitset compute, cost is cheaper
if !st.PkFilter.TestLocations(lc.Locations(st.PkFilter.K())) {
return false
}
// check pk range after
return st.MinPK.LE(lc.pk) && st.MaxPK.GE(lc.pk)
}
// LocationsCache is a helper struct caching pk bloom filter locations.
// Note that this helper is not concurrent safe and shall be used in same goroutine.
type LocationsCache struct {
pk PrimaryKey
locations map[uint][]uint64
}
func (lc LocationsCache) Locations(k uint) []uint64 {
locs, ok := lc.locations[k]
if ok {
return locs
}
locs = Locations(lc.pk, k)
lc.locations[k] = locs
return locs
}
func NewLocationsCache(pk PrimaryKey) LocationsCache {
return LocationsCache{
pk: pk,
locations: make(map[uint][]uint64),
}
}