// 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 rootcoord

import (
	"context"
	"errors"
	"fmt"
	"math/rand"
	"path"
	"sync"
	"testing"
	"time"

	"github.com/golang/protobuf/proto"
	"github.com/milvus-io/milvus/internal/kv"
	etcdkv "github.com/milvus-io/milvus/internal/kv/etcd"
	memkv "github.com/milvus-io/milvus/internal/kv/mem"
	kvmetestore "github.com/milvus-io/milvus/internal/metastore/kv"
	"github.com/milvus-io/milvus/internal/metastore/model"
	"github.com/milvus-io/milvus/internal/proto/commonpb"
	pb "github.com/milvus-io/milvus/internal/proto/etcdpb"
	"github.com/milvus-io/milvus/internal/proto/internalpb"
	"github.com/milvus-io/milvus/internal/proto/schemapb"
	"github.com/milvus-io/milvus/internal/util/etcd"
	"github.com/milvus-io/milvus/internal/util/typeutil"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

type mockTestKV struct {
	kv.TxnKV

	loadWithPrefix               func(key string, ts typeutil.Timestamp) ([]string, []string, error)
	save                         func(key, value string, ts typeutil.Timestamp) error
	multiSave                    func(kvs map[string]string, ts typeutil.Timestamp) error
	multiSaveAndRemoveWithPrefix func(saves map[string]string, removals []string, ts typeutil.Timestamp) error
}

func (m *mockTestKV) LoadWithPrefix(key string, ts typeutil.Timestamp) ([]string, []string, error) {
	return m.loadWithPrefix(key, ts)
}
func (m *mockTestKV) Load(key string, ts typeutil.Timestamp) (string, error) {
	return "", nil
}

func (m *mockTestKV) Save(key, value string, ts typeutil.Timestamp) error {
	return m.save(key, value, ts)
}

func (m *mockTestKV) MultiSave(kvs map[string]string, ts typeutil.Timestamp) error {
	return m.multiSave(kvs, ts)
}

func (m *mockTestKV) MultiSaveAndRemoveWithPrefix(saves map[string]string, removals []string, ts typeutil.Timestamp) error {
	return m.multiSaveAndRemoveWithPrefix(saves, removals, ts)
}

type mockTestTxnKV struct {
	kv.TxnKV
	loadWithPrefix               func(key string) ([]string, []string, error)
	save                         func(key, value string) error
	multiSave                    func(kvs map[string]string) error
	multiSaveAndRemoveWithPrefix func(saves map[string]string, removals []string) error
	remove                       func(key string) error
}

func (m *mockTestTxnKV) LoadWithPrefix(key string) ([]string, []string, error) {
	return m.loadWithPrefix(key)
}

func (m *mockTestTxnKV) Save(key, value string) error {
	return m.save(key, value)
}

func (m *mockTestTxnKV) MultiSave(kvs map[string]string) error {
	return m.multiSave(kvs)
}

func (m *mockTestTxnKV) MultiSaveAndRemoveWithPrefix(saves map[string]string, removals []string) error {
	return m.multiSaveAndRemoveWithPrefix(saves, removals)
}

func (m *mockTestTxnKV) Remove(key string) error {
	return m.remove(key)
}

func Test_MockKV(t *testing.T) {
	k1 := &mockTestKV{}
	kt := &mockTestTxnKV{}
	prefix := make(map[string][]string)
	k1.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
		if val, ok := prefix[key]; ok {
			return nil, val, nil
		}
		return nil, nil, fmt.Errorf("load prefix error")
	}
	kt.loadWithPrefix = func(key string) ([]string, []string, error) {
		if val, ok := prefix[key]; ok {
			return nil, val, nil
		}
		return nil, nil, fmt.Errorf("load prefix error")
	}

	_, err := NewMetaTable(context.TODO(), kt, k1)
	assert.NotNil(t, err)
	assert.EqualError(t, err, "load prefix error")

	// collection
	prefix[kvmetestore.CollectionMetaPrefix] = []string{"collection-meta"}
	_, err = NewMetaTable(context.TODO(), kt, k1)
	assert.NotNil(t, err)

	value, err := proto.Marshal(&pb.CollectionInfo{Schema: &schemapb.CollectionSchema{}})
	assert.Nil(t, err)
	prefix[kvmetestore.CollectionMetaPrefix] = []string{string(value)}
	_, err = NewMetaTable(context.TODO(), kt, k1)
	assert.NotNil(t, err)

	// segment index
	prefix[kvmetestore.SegmentIndexMetaPrefix] = []string{"segment-index-meta"}
	_, err = NewMetaTable(context.TODO(), kt, k1)
	assert.NotNil(t, err)

	value, err = proto.Marshal(&pb.SegmentIndexInfo{})
	assert.Nil(t, err)
	prefix[kvmetestore.SegmentIndexMetaPrefix] = []string{string(value)}
	_, err = NewMetaTable(context.TODO(), kt, k1)
	assert.NotNil(t, err)

	prefix[kvmetestore.SegmentIndexMetaPrefix] = []string{string(value), string(value)}
	_, err = NewMetaTable(context.TODO(), kt, k1)
	assert.NotNil(t, err)
	assert.EqualError(t, err, "load prefix error")

	// index
	prefix[kvmetestore.IndexMetaPrefix] = []string{"index-meta"}
	_, err = NewMetaTable(context.TODO(), kt, k1)
	assert.NotNil(t, err)

	value, err = proto.Marshal(&pb.IndexInfo{})
	assert.Nil(t, err)
	prefix[kvmetestore.IndexMetaPrefix] = []string{string(value)}
	_, err = NewMetaTable(context.TODO(), kt, k1)
	assert.NotNil(t, err)
	assert.EqualError(t, err, "load prefix error")
}

func TestMetaTable(t *testing.T) {
	const (
		collName        = "testColl"
		collNameInvalid = "testColl_invalid"
		aliasName1      = "alias1"
		aliasName2      = "alias2"
		collID          = typeutil.UniqueID(1)
		collIDInvalid   = typeutil.UniqueID(2)
		partIDDefault   = typeutil.UniqueID(10)
		partID          = typeutil.UniqueID(20)
		partName        = "testPart"
		partIDInvalid   = typeutil.UniqueID(21)
		segID           = typeutil.UniqueID(100)
		segID2          = typeutil.UniqueID(101)
		fieldID         = typeutil.UniqueID(110)
		fieldID2        = typeutil.UniqueID(111)
		indexID         = typeutil.UniqueID(10000)
		indexID2        = typeutil.UniqueID(10001)
		buildID         = typeutil.UniqueID(201)
		indexName       = "testColl_index_110"
	)

	rand.Seed(time.Now().UnixNano())
	randVal := rand.Int()
	Params.Init()
	rootPath := fmt.Sprintf("/test/meta/%d", randVal)

	var vtso typeutil.Timestamp
	ftso := func() typeutil.Timestamp {
		vtso++
		return vtso
	}

	etcdCli, err := etcd.GetEtcdClient(&Params.EtcdCfg)
	require.Nil(t, err)
	defer etcdCli.Close()

	skv, err := kvmetestore.NewMetaSnapshot(etcdCli, rootPath, TimestampPrefix, 7)
	assert.Nil(t, err)
	assert.NotNil(t, skv)
	txnKV := etcdkv.NewEtcdKV(etcdCli, rootPath)
	mt, err := NewMetaTable(context.TODO(), txnKV, skv)
	assert.Nil(t, err)

	collInfo := &model.Collection{
		CollectionID: collID,
		Name:         collName,
		AutoID:       false,
		Fields: []*model.Field{
			{
				FieldID:      fieldID,
				Name:         "field110",
				IsPrimaryKey: false,
				Description:  "",
				DataType:     schemapb.DataType_FloatVector,
				TypeParams: []*commonpb.KeyValuePair{
					{
						Key:   "field110-k1",
						Value: "field110-v1",
					},
					{
						Key:   "field110-k2",
						Value: "field110-v2",
					},
				},
				IndexParams: []*commonpb.KeyValuePair{
					{
						Key:   "field110-i1",
						Value: "field110-v1",
					},
					{
						Key:   "field110-i2",
						Value: "field110-v2",
					},
				},
			},
		},
		FieldIndexes: []*model.Index{
			{
				FieldID: fieldID,
				IndexID: indexID,
			},
		},
		CreateTime: 0,
		Partitions: []*model.Partition{
			{
				PartitionID:               partIDDefault,
				PartitionName:             Params.CommonCfg.DefaultPartitionName,
				PartitionCreatedTimestamp: 0,
			},
		},
	}

	idxInfo := []*model.Index{
		{
			IndexName: indexName,
			IndexID:   indexID,
			IndexParams: []*commonpb.KeyValuePair{
				{
					Key:   "field110-i1",
					Value: "field110-v1",
				},
				{
					Key:   "field110-i2",
					Value: "field110-v2",
				},
			},
		},
	}

	mt.indexID2Meta[indexID] = *idxInfo[0]

	var wg sync.WaitGroup
	wg.Add(1)
	t.Run("add collection", func(t *testing.T) {
		defer wg.Done()
		ts := ftso()

		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)
		assert.Equal(t, uint64(1), ts)

		collMeta, err := mt.GetCollectionByName(collName, ts)
		assert.Nil(t, err)
		assert.Equal(t, collMeta.CreateTime, ts)
		assert.Equal(t, collMeta.Partitions[0].PartitionCreatedTimestamp, ts)

		assert.Equal(t, partIDDefault, collMeta.Partitions[0].PartitionID)
		assert.Equal(t, 1, len(collMeta.Partitions))
		assert.True(t, mt.HasCollection(collInfo.CollectionID, 0))

		field, err := mt.GetFieldSchema(collName, "field110")
		assert.Nil(t, err)
		assert.Equal(t, collInfo.Fields[0].FieldID, field.FieldID)

		// check DD operation flag
		flag, err := mt.snapshot.Load(DDMsgSendPrefix, 0)
		assert.Nil(t, err)
		assert.Equal(t, "false", flag)
	})

	wg.Add(1)
	t.Run("add alias", func(t *testing.T) {
		defer wg.Done()
		ts := ftso()
		exists := mt.IsAlias(aliasName1)
		assert.False(t, exists)
		err = mt.AddAlias(aliasName1, collName, ts)
		assert.Nil(t, err)
		aliases := mt.ListAliases(collID)
		assert.Equal(t, aliases, []string{aliasName1})
		exists = mt.IsAlias(aliasName1)
		assert.True(t, exists)
	})
	wg.Add(1)
	t.Run("alter alias", func(t *testing.T) {
		defer wg.Done()
		ts := ftso()
		err = mt.AlterAlias(aliasName1, collName, ts)
		assert.Nil(t, err)
		err = mt.AlterAlias(aliasName1, collNameInvalid, ts)
		assert.NotNil(t, err)
	})

	wg.Add(1)
	t.Run("delete alias", func(t *testing.T) {
		defer wg.Done()
		ts := ftso()
		err = mt.DropAlias(aliasName1, ts)
		assert.Nil(t, err)
	})

	wg.Add(1)
	t.Run("add partition", func(t *testing.T) {
		defer wg.Done()
		ts := ftso()
		err = mt.AddPartition(collID, partName, partID, ts, "")
		assert.Nil(t, err)
		//assert.Equal(t, ts, uint64(2))

		collMeta, ok := mt.collID2Meta[collID]
		assert.True(t, ok)
		assert.Equal(t, 2, len(collMeta.Partitions))
		assert.Equal(t, collMeta.Partitions[1].PartitionName, partName)
		assert.Equal(t, ts, collMeta.Partitions[1].PartitionCreatedTimestamp)

		// check DD operation flag
		flag, err := mt.txn.Load(DDMsgSendPrefix)
		assert.Nil(t, err)
		assert.Equal(t, "false", flag)
	})

	wg.Add(1)
	t.Run("add segment index", func(t *testing.T) {
		defer wg.Done()
		index := model.Index{
			CollectionID: collID,
			FieldID:      fieldID,
			IndexID:      indexID,
			SegmentIndexes: map[int64]model.SegmentIndex{
				segID: {
					Segment: model.Segment{
						SegmentID:   segID,
						PartitionID: partID,
					},
					BuildID:     buildID,
					EnableIndex: true,
				},
			},
		}
		err = mt.AlterIndex(&index)
		assert.Nil(t, err)

		// it's legal to add index twice
		err = mt.AlterIndex(&index)
		assert.Nil(t, err)

		idxMeta, ok := mt.segID2IndexMeta[segID]
		assert.True(t, ok)
		segMeta, ok := idxMeta[indexID]
		assert.True(t, ok)
		assert.True(t, segMeta.SegmentIndexes[segID].EnableIndex)
	})

	wg.Add(1)
	t.Run("add diff index with same index name", func(t *testing.T) {
		defer wg.Done()
		params := []*commonpb.KeyValuePair{
			{
				Key:   "field110-k1",
				Value: "field110-v1",
			},
			{
				Key:   "field110-k2",
				Value: "field110-v2",
			},
		}
		idxInfo := &model.Index{
			IndexName:   "testColl_index_110",
			IndexID:     indexID,
			IndexParams: params,
		}

		err := mt.AddIndex("collTest", "field110", idxInfo, []typeutil.UniqueID{segID})
		assert.NotNil(t, err)
	})

	wg.Add(1)
	t.Run("get not indexed segments", func(t *testing.T) {
		defer wg.Done()
		params := []*commonpb.KeyValuePair{
			{
				Key:   "field110-i1",
				Value: "field110-v1",
			},
			{
				Key:   "field110-i2",
				Value: "field110-v2",
			},
		}

		tparams := []*commonpb.KeyValuePair{
			{
				Key:   "field110-k1",
				Value: "field110-v1",
			},
			{
				Key:   "field110-k2",
				Value: "field110-v2",
			},
		}
		idxInfo := &model.Index{
			IndexName:   "field110",
			IndexID:     2000,
			IndexParams: params,
		}

		_, _, err := mt.GetNotIndexedSegments("collTest", "field110", idxInfo, nil)
		assert.NotNil(t, err)
		seg, field, err := mt.GetNotIndexedSegments(collName, "field110", idxInfo, []typeutil.UniqueID{segID, segID2})
		assert.Nil(t, err)
		assert.Equal(t, 1, len(seg))
		assert.Equal(t, segID2, seg[0])
		assert.True(t, EqualKeyPairArray(field.TypeParams, tparams))

		params = []*commonpb.KeyValuePair{
			{
				Key:   "field110-i1",
				Value: "field110-v1",
			},
		}
		idxInfo.IndexParams = params
		idxInfo.IndexID = 2001
		idxInfo.IndexName = "field110-1"

		seg, field, err = mt.GetNotIndexedSegments(collName, "field110", idxInfo, []typeutil.UniqueID{segID, segID2})
		assert.Nil(t, err)
		assert.Equal(t, 2, len(seg))
		assert.Equal(t, segID, seg[0])
		assert.Equal(t, segID2, seg[1])
		assert.True(t, EqualKeyPairArray(field.TypeParams, tparams))
	})

	wg.Add(1)
	t.Run("get index by name", func(t *testing.T) {
		defer wg.Done()
		_, idx, err := mt.GetIndexByName(collName, indexName)
		assert.Nil(t, err)
		assert.Equal(t, 1, len(idx))
		assert.Equal(t, idxInfo[0].IndexID, idx[0].IndexID)
		params := []*commonpb.KeyValuePair{
			{
				Key:   "field110-i1",
				Value: "field110-v1",
			},
			{
				Key:   "field110-i2",
				Value: "field110-v2",
			},
		}
		assert.True(t, EqualKeyPairArray(idx[0].IndexParams, params))

		_, idx, err = mt.GetIndexByName(collName, "idx201")
		assert.Nil(t, err)
		assert.Zero(t, len(idx))
	})

	wg.Add(1)
	t.Run("drop index", func(t *testing.T) {
		defer wg.Done()
		idx, ok, err := mt.DropIndex(collName, "field110", indexName)
		assert.Nil(t, err)
		assert.True(t, ok)
		assert.Equal(t, idxInfo[0].IndexID, idx)

		_, ok, err = mt.DropIndex(collName, "field110", "field110-error")
		assert.Nil(t, err)
		assert.False(t, ok)

		_, idxs, err := mt.GetIndexByName(collName, "field110")
		assert.Nil(t, err)
		assert.Zero(t, len(idxs))

		_, err = mt.GetSegmentIndexInfoByID(segID, -1, "")
		assert.NotNil(t, err)
	})

	wg.Add(1)
	t.Run("drop partition", func(t *testing.T) {
		defer wg.Done()
		ts := ftso()
		id, err := mt.DeletePartition(collID, partName, ts, "")
		assert.Nil(t, err)
		assert.Equal(t, partID, id)

		// check DD operation flag
		flag, err := mt.txn.Load(DDMsgSendPrefix)
		assert.Nil(t, err)
		assert.Equal(t, "false", flag)
	})

	wg.Add(1)
	t.Run("drop collection", func(t *testing.T) {
		defer wg.Done()
		ts := ftso()
		err = mt.DeleteCollection(collIDInvalid, ts, "")
		assert.NotNil(t, err)
		ts2 := ftso()
		err = mt.AddAlias(aliasName2, collName, ts2)
		assert.Nil(t, err)
		err = mt.DeleteCollection(collID, ts, "")
		assert.Nil(t, err)
		ts3 := ftso()
		err = mt.DropAlias(aliasName2, ts3)
		assert.NotNil(t, err)

		// check DD operation flag
		flag, err := mt.txn.Load(DDMsgSendPrefix)
		assert.Nil(t, err)
		assert.Equal(t, "false", flag)
	})

	wg.Add(1)
	t.Run("delete credential", func(t *testing.T) {
		defer wg.Done()

		err = mt.DeleteCredential("")
		assert.Nil(t, err)

		err = mt.DeleteCredential("abcxyz")
		assert.Nil(t, err)
	})

	/////////////////////////// these tests should run at last, it only used to hit the error lines ////////////////////////
	txnkv := etcdkv.NewEtcdKV(etcdCli, rootPath)
	mockKV := &mockTestKV{
		loadWithPrefix: func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		},
	}
	mockTxnKV := &mockTestTxnKV{
		TxnKV:          mt.txn,
		loadWithPrefix: func(key string) ([]string, []string, error) { return txnkv.LoadWithPrefix(key) },
		save:           func(key, value string) error { return txnkv.Save(key, value) },
		multiSave:      func(kvs map[string]string) error { return txnkv.MultiSave(kvs) },
		multiSaveAndRemoveWithPrefix: func(kvs map[string]string, removal []string) error {
			return txnkv.MultiSaveAndRemoveWithPrefix(kvs, removal)
		},
		remove: func(key string) error { return txnkv.Remove(key) },
	}

	mt, err = NewMetaTable(context.TODO(), mockTxnKV, mockKV)
	assert.Nil(t, err)

	wg.Add(1)
	t.Run("add collection failed", func(t *testing.T) {
		defer wg.Done()
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		mockKV.multiSave = func(kvs map[string]string, ts typeutil.Timestamp) error {
			return fmt.Errorf("multi save error")
		}
		collInfo.Partitions = []*model.Partition{}
		assert.Error(t, mt.AddCollection(collInfo, 0, ""))
	})

	wg.Add(1)
	t.Run("delete collection failed", func(t *testing.T) {
		defer wg.Done()
		mockKV.multiSave = func(kvs map[string]string, ts typeutil.Timestamp) error {
			return nil
		}
		mockKV.multiSaveAndRemoveWithPrefix = func(save map[string]string, keys []string, ts typeutil.Timestamp) error {
			return fmt.Errorf("multi save and remove with prefix error")
		}
		ts := ftso()
		assert.Error(t, mt.DeleteCollection(collInfo.CollectionID, ts, ""))
	})

	wg.Add(1)
	t.Run("get collection failed", func(t *testing.T) {
		defer wg.Done()
		mockKV.save = func(key string, value string, ts typeutil.Timestamp) error {
			return nil
		}

		ts := ftso()
		collInfo.Partitions = []*model.Partition{}
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)

		mt.collID2Meta = make(map[int64]model.Collection)
		_, err = mt.GetCollectionByName(collInfo.Name, 0)
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("can't find collection %s with id %d", collInfo.Name, collInfo.CollectionID))

	})

	wg.Add(1)
	t.Run("add partition failed", func(t *testing.T) {
		defer wg.Done()
		mockKV.save = func(key string, value string, ts typeutil.Timestamp) error {
			return nil
		}
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		err := mt.reloadFromKV()
		assert.Nil(t, err)

		ts := ftso()
		collInfo.Partitions = []*model.Partition{}
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)

		ts = ftso()
		err = mt.AddPartition(2, "no-part", 22, ts, "")
		assert.NotNil(t, err)
		assert.EqualError(t, err, "can't find collection. id = 2")

		coll := mt.collID2Meta[collInfo.CollectionID]
		coll.Partitions = make([]*model.Partition, Params.RootCoordCfg.MaxPartitionNum)
		mt.collID2Meta[coll.CollectionID] = coll
		err = mt.AddPartition(coll.CollectionID, "no-part", 22, ts, "")
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("maximum partition's number should be limit to %d", Params.RootCoordCfg.MaxPartitionNum))

		coll.Partitions = []*model.Partition{{PartitionID: partID, PartitionName: partName, PartitionCreatedTimestamp: ftso()}}
		mt.collID2Meta[coll.CollectionID] = coll

		mockKV.multiSave = func(kvs map[string]string, ts typeutil.Timestamp) error {
			return fmt.Errorf("multi save error")
		}
		assert.Error(t, mt.AddPartition(coll.CollectionID, "no-part", 22, ts, ""))
		//err = mt.AddPartition(coll.CollectionID, "no-part", 22, ts, nil)
		//assert.NotNil(t, err)
		//assert.EqualError(t, err, "multi save error")

		mockKV.multiSave = func(kvs map[string]string, ts typeutil.Timestamp) error {
			return nil
		}

		collInfo.Partitions = []*model.Partition{}
		ts = ftso()
		err = mt.AddPartition(coll.CollectionID, partName, 22, ts, "")
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("partition name = %s already exists", partName))
		err = mt.AddPartition(coll.CollectionID, "no-part", partID, ts, "")
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("partition id = %d already exists", partID))
	})

	wg.Add(1)
	t.Run("has partition failed", func(t *testing.T) {
		defer wg.Done()
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		mockKV.multiSave = func(kvs map[string]string, ts typeutil.Timestamp) error {
			return nil
		}
		err := mt.reloadFromKV()
		assert.Nil(t, err)

		collInfo.Partitions = []*model.Partition{}
		ts := ftso()
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)

		assert.False(t, mt.HasPartition(collInfo.CollectionID, "no-partName", 0))

		mt.collID2Meta = make(map[int64]model.Collection)
		assert.False(t, mt.HasPartition(collInfo.CollectionID, partName, 0))
	})

	wg.Add(1)
	t.Run("delete partition failed", func(t *testing.T) {
		defer wg.Done()
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		mockKV.multiSave = func(kvs map[string]string, ts typeutil.Timestamp) error {
			return nil
		}
		err := mt.reloadFromKV()
		assert.Nil(t, err)

		collInfo.Partitions = []*model.Partition{{PartitionID: partID, PartitionName: partName, PartitionCreatedTimestamp: ftso()}}
		ts := ftso()
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)

		ts = ftso()
		_, err = mt.DeletePartition(collInfo.CollectionID, Params.CommonCfg.DefaultPartitionName, ts, "")
		assert.NotNil(t, err)
		assert.EqualError(t, err, "default partition cannot be deleted")

		_, err = mt.DeletePartition(collInfo.CollectionID, "abc", ts, "")
		assert.NotNil(t, err)
		assert.EqualError(t, err, "partition abc does not exist")

		mockKV.save = func(key, value string, ts typeutil.Timestamp) error { return errors.New("mocked error") }
		_, err = mt.DeletePartition(collInfo.CollectionID, partName, ts, "")
		assert.Error(t, err)

		mt.collID2Meta = make(map[int64]model.Collection)
		_, err = mt.DeletePartition(collInfo.CollectionID, "abc", ts, "")
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("can't find collection id = %d", collInfo.CollectionID))
	})

	wg.Add(1)
	t.Run("add index failed", func(t *testing.T) {
		defer wg.Done()
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		mockKV.multiSave = func(kvs map[string]string, ts typeutil.Timestamp) error {
			return nil
		}
		mockKV.save = func(key, value string, ts typeutil.Timestamp) error {
			return nil
		}
		err = mt.reloadFromKV()
		assert.Nil(t, err)

		collInfo.Partitions = []*model.Partition{}
		ts := ftso()
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)

		segIdxInfo := model.Index{
			CollectionID: collID,
			FieldID:      fieldID,
			IndexID:      indexID2,
			SegmentIndexes: map[int64]model.SegmentIndex{
				segID: {
					Segment: model.Segment{
						SegmentID:   segID,
						PartitionID: partID,
					},
					BuildID: buildID,
				},
			},
		}
		err = mt.AlterIndex(&segIdxInfo)
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("index id = %d not found", segIdxInfo.IndexID))

		mt.collID2Meta = make(map[int64]model.Collection)
		err = mt.AlterIndex(&segIdxInfo)
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("collection id = %d not found", collInfo.CollectionID))

		err = mt.reloadFromKV()
		assert.Nil(t, err)

		collInfo.Partitions = []*model.Partition{}
		ts = ftso()
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)

		segIdxInfo.IndexID = indexID
		mt.indexID2Meta[indexID] = segIdxInfo
		mockTxnKV.multiSave = func(kvs map[string]string) error {
			return fmt.Errorf("save error")
		}
		assert.Error(t, mt.AlterIndex(&segIdxInfo))
	})

	wg.Add(1)
	t.Run("drop index failed", func(t *testing.T) {
		defer wg.Done()
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		mockKV.multiSave = func(kvs map[string]string, ts typeutil.Timestamp) error {
			return nil
		}
		mockKV.save = func(key string, value string, ts typeutil.Timestamp) error {
			return nil
		}
		err := mt.reloadFromKV()
		assert.Nil(t, err)

		collInfo.Partitions = []*model.Partition{}
		ts := ftso()
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)
		mt.indexID2Meta[indexID] = *idxInfo[0]

		_, _, err = mt.DropIndex("abc", "abc", "abc")
		assert.NotNil(t, err)
		assert.EqualError(t, err, "collection name = abc not exist")

		mt.collName2ID["abc"] = 2
		_, _, err = mt.DropIndex("abc", "abc", "abc")
		assert.NotNil(t, err)
		assert.EqualError(t, err, "collection name  = abc not has meta")

		_, _, err = mt.DropIndex(collInfo.Name, "abc", "abc")
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("collection %s doesn't have filed abc", collInfo.Name))

		coll := mt.collID2Meta[collInfo.CollectionID]
		coll.FieldIndexes = []*model.Index{
			{
				FieldID: fieldID2,
				IndexID: indexID2,
			},
			{
				FieldID: fieldID,
				IndexID: indexID,
			},
		}
		mt.collID2Meta[coll.CollectionID] = coll
		mt.indexID2Meta = make(map[int64]model.Index)
		idxID, isDroped, err := mt.DropIndex(collInfo.Name, collInfo.Fields[0].Name, idxInfo[0].IndexName)
		assert.Zero(t, idxID)
		assert.False(t, isDroped)
		assert.Nil(t, err)

		err = mt.reloadFromKV()
		assert.Nil(t, err)
		collInfo.Partitions = []*model.Partition{}
		ts = ftso()
		err = mt.AddCollection(collInfo, ts, "")
		mt.indexID2Meta[indexID] = *idxInfo[0]

		assert.Nil(t, err)
		mockTxnKV.multiSaveAndRemoveWithPrefix = func(saves map[string]string, removals []string) error {
			return fmt.Errorf("multi save and remove with prefix error")
		}

		_, _, err = mt.DropIndex(collInfo.Name, collInfo.Fields[0].Name, idxInfo[0].IndexName)
		assert.Error(t, err)
	})

	wg.Add(1)
	t.Run("get segment index info by id", func(t *testing.T) {
		defer wg.Done()
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		mockTxnKV.multiSave = func(kvs map[string]string) error {
			return nil
		}
		mockTxnKV.save = func(key, value string) error {
			return nil
		}
		err := mt.reloadFromKV()
		assert.Nil(t, err)

		collInfo.Partitions = []*model.Partition{}
		ts := ftso()
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)
		mt.indexID2Meta[indexID] = *idxInfo[0]

		index, err := mt.GetSegmentIndexInfoByID(segID2, fieldID, "abc")
		assert.Nil(t, err)
		assert.Equal(t, segID2, index.SegmentIndexes[segID2].Segment.SegmentID)
		assert.Equal(t, fieldID, index.FieldID)
		assert.Equal(t, false, index.SegmentIndexes[segID2].EnableIndex)

		segIdxInfo := model.Index{
			CollectionID: collID,
			SegmentIndexes: map[int64]model.SegmentIndex{
				segID: {
					Segment: model.Segment{
						SegmentID:   segID,
						PartitionID: partID,
					},
					BuildID: buildID,
				},
			},
			FieldID: fieldID,
			IndexID: indexID,
		}
		err = mt.AlterIndex(&segIdxInfo)
		assert.Nil(t, err)
		idx, err := mt.GetSegmentIndexInfoByID(segID, segIdxInfo.FieldID, idxInfo[0].IndexName)
		assert.Nil(t, err)
		assert.Equal(t, segIdxInfo.IndexID, idx.IndexID)

		_, err = mt.GetSegmentIndexInfoByID(segID, segIdxInfo.FieldID, "abc")
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("can't find index name = abc on segment = %d, with filed id = %d", segID, segIdxInfo.FieldID))

		_, err = mt.GetSegmentIndexInfoByID(segID, 11, idxInfo[0].IndexName)
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("can't find index name = %s on segment = %d, with filed id = 11", idxInfo[0].IndexName, segID))
	})

	wg.Add(1)
	t.Run("get field schema failed", func(t *testing.T) {
		defer wg.Done()
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		mockKV.multiSave = func(kvs map[string]string, ts typeutil.Timestamp) error {
			return nil
		}
		mockKV.save = func(key string, value string, ts typeutil.Timestamp) error {
			return nil
		}
		err := mt.reloadFromKV()
		assert.Nil(t, err)

		collInfo.Partitions = []*model.Partition{}
		ts := ftso()
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)

		mt.collID2Meta = make(map[int64]model.Collection)
		_, err = mt.unlockGetFieldSchema(collInfo.Name, collInfo.Fields[0].Name)
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("collection %s not found", collInfo.Name))

		mt.collName2ID = make(map[string]int64)
		_, err = mt.unlockGetFieldSchema(collInfo.Name, collInfo.Fields[0].Name)
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("collection %s not found", collInfo.Name))
	})

	wg.Add(1)
	t.Run("is segment indexed", func(t *testing.T) {
		defer wg.Done()
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		err := mt.reloadFromKV()
		assert.Nil(t, err)
		idx := &pb.SegmentIndexInfo{
			IndexID:   30,
			FieldID:   31,
			SegmentID: 32,
		}
		idxMeta := make(map[int64]pb.SegmentIndexInfo)
		idxMeta[idx.IndexID] = *idx

		field := model.Field{
			FieldID: 31,
		}
		assert.False(t, mt.IsSegmentIndexed(idx.SegmentID, &field, nil))
		field.FieldID = 34
		assert.False(t, mt.IsSegmentIndexed(idx.SegmentID, &field, nil))
	})

	wg.Add(1)
	t.Run("get not indexed segments", func(t *testing.T) {
		defer wg.Done()
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		err := mt.reloadFromKV()
		assert.Nil(t, err)

		idx := &model.Index{
			IndexName: "no-idx",
			IndexID:   456,
			IndexParams: []*commonpb.KeyValuePair{
				{
					Key:   "no-idx-k1",
					Value: "no-idx-v1",
				},
			},
		}

		mt.collName2ID["abc"] = 123
		_, _, err = mt.GetNotIndexedSegments("abc", "no-field", idx, nil)
		assert.NotNil(t, err)
		assert.EqualError(t, err, "collection abc not found")

		mockKV.multiSave = func(kvs map[string]string, ts typeutil.Timestamp) error {
			return nil
		}
		mockKV.save = func(key string, value string, ts typeutil.Timestamp) error {
			return nil
		}
		err = mt.reloadFromKV()
		assert.Nil(t, err)

		collInfo.Partitions = []*model.Partition{}
		ts := ftso()
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)

		_, _, err = mt.GetNotIndexedSegments(collInfo.Name, "no-field", idx, nil)
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("collection %s doesn't have filed no-field", collInfo.Name))

		mt.indexID2Meta = make(map[int64]model.Index)
		_, _, err = mt.GetNotIndexedSegments(collInfo.Name, collInfo.Fields[0].Name, idx, nil)
		assert.Nil(t, err)
	})

	wg.Add(1)
	t.Run("get index by name failed", func(t *testing.T) {
		defer wg.Done()
		mockKV.loadWithPrefix = func(key string, ts typeutil.Timestamp) ([]string, []string, error) {
			return nil, nil, nil
		}
		err := mt.reloadFromKV()
		assert.Nil(t, err)

		mt.collName2ID["abc"] = 123
		_, _, err = mt.GetIndexByName("abc", "hij")
		assert.NotNil(t, err)
		assert.EqualError(t, err, "collection abc not found")

		mockTxnKV.multiSave = func(kvs map[string]string) error {
			return nil
		}
		mockTxnKV.save = func(key string, value string) error {
			return nil
		}
		err = mt.reloadFromKV()
		assert.Nil(t, err)

		collInfo.Partitions = []*model.Partition{}
		ts := ftso()
		err = mt.AddCollection(collInfo, ts, "")
		assert.Nil(t, err)
		mt.indexID2Meta = make(map[int64]model.Index)
		_, _, err = mt.GetIndexByName(collInfo.Name, idxInfo[0].IndexName)
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("index id = %d not found", idxInfo[0].IndexID))

		_, err = mt.GetIndexByID(idxInfo[0].IndexID)
		assert.NotNil(t, err)
		assert.EqualError(t, err, fmt.Sprintf("cannot find index, id = %d", idxInfo[0].IndexID))
	})

	wg.Add(1)
	t.Run("add credential failed", func(t *testing.T) {
		defer wg.Done()
		mockTxnKV.save = func(key, value string) error {
			return fmt.Errorf("save error")
		}
		err = mt.AddCredential(&internalpb.CredentialInfo{Username: "x", EncryptedPassword: "a\xc5z"})
		assert.NotNil(t, err)
	})

	wg.Add(1)
	t.Run("delete credential failed", func(t *testing.T) {
		defer wg.Done()
		mockTxnKV.remove = func(key string) error {
			return fmt.Errorf("delete error")
		}
		err := mt.DeleteCredential("")
		assert.Error(t, err)
	})
	wg.Wait()
}

func TestMetaWithTimestamp(t *testing.T) {
	const (
		collID1   = typeutil.UniqueID(1)
		collID2   = typeutil.UniqueID(2)
		collName1 = "t1"
		collName2 = "t2"
		partID1   = 11
		partID2   = 12
		partName1 = "p1"
		partName2 = "p2"
	)
	rand.Seed(time.Now().UnixNano())
	randVal := rand.Int()
	Params.Init()
	rootPath := fmt.Sprintf("/test/meta/%d", randVal)

	var tsoStart typeutil.Timestamp = 100
	vtso := tsoStart
	ftso := func() typeutil.Timestamp {
		vtso++
		return vtso
	}
	etcdCli, err := etcd.GetEtcdClient(&Params.EtcdCfg)
	assert.Nil(t, err)
	defer etcdCli.Close()

	skv, err := kvmetestore.NewMetaSnapshot(etcdCli, rootPath, TimestampPrefix, 7)
	assert.Nil(t, err)
	assert.NotNil(t, skv)
	txnKV := etcdkv.NewEtcdKV(etcdCli, rootPath)
	mt, err := NewMetaTable(context.TODO(), txnKV, skv)
	assert.Nil(t, err)

	collInfo := &model.Collection{
		CollectionID: collID1,
		Name:         collName1,
	}

	collInfo.Partitions = []*model.Partition{{PartitionID: partID1, PartitionName: partName1, PartitionCreatedTimestamp: ftso()}}
	t1 := ftso()
	err = mt.AddCollection(collInfo, t1, "")
	assert.Nil(t, err)

	collInfo.CollectionID = collID2
	collInfo.Partitions = []*model.Partition{{PartitionID: partID2, PartitionName: partName2, PartitionCreatedTimestamp: ftso()}}
	collInfo.Name = collName2
	t2 := ftso()
	err = mt.AddCollection(collInfo, t2, "")
	assert.Nil(t, err)

	assert.True(t, mt.HasCollection(collID1, 0))
	assert.True(t, mt.HasCollection(collID2, 0))

	assert.True(t, mt.HasCollection(collID1, t2))
	assert.True(t, mt.HasCollection(collID2, t2))

	assert.True(t, mt.HasCollection(collID1, t1))
	assert.False(t, mt.HasCollection(collID2, t1))

	assert.False(t, mt.HasCollection(collID1, tsoStart))
	assert.False(t, mt.HasCollection(collID2, tsoStart))

	c1, err := mt.GetCollectionByID(collID1, 0)
	assert.Nil(t, err)
	c2, err := mt.GetCollectionByID(collID2, 0)
	assert.Nil(t, err)
	assert.Equal(t, collID1, c1.CollectionID)
	assert.Equal(t, collID2, c2.CollectionID)

	c1, err = mt.GetCollectionByID(collID1, t2)
	assert.Nil(t, err)
	c2, err = mt.GetCollectionByID(collID2, t2)
	assert.Nil(t, err)
	assert.Equal(t, collID1, c1.CollectionID)
	assert.Equal(t, collID2, c2.CollectionID)

	c1, err = mt.GetCollectionByID(collID1, t1)
	assert.Nil(t, err)
	c2, err = mt.GetCollectionByID(collID2, t1)
	assert.NotNil(t, err)
	assert.Equal(t, int64(1), c1.CollectionID)

	c1, err = mt.GetCollectionByID(collID1, tsoStart)
	assert.NotNil(t, err)
	c2, err = mt.GetCollectionByID(collID2, tsoStart)
	assert.NotNil(t, err)

	c1, err = mt.GetCollectionByName(collName1, 0)
	assert.Nil(t, err)
	c2, err = mt.GetCollectionByName(collName2, 0)
	assert.Nil(t, err)
	assert.Equal(t, int64(1), c1.CollectionID)
	assert.Equal(t, int64(2), c2.CollectionID)

	c1, err = mt.GetCollectionByName(collName1, t2)
	assert.Nil(t, err)
	c2, err = mt.GetCollectionByName(collName2, t2)
	assert.Nil(t, err)
	assert.Equal(t, int64(1), c1.CollectionID)
	assert.Equal(t, int64(2), c2.CollectionID)

	c1, err = mt.GetCollectionByName(collName1, t1)
	assert.Nil(t, err)
	c2, err = mt.GetCollectionByName(collName2, t1)
	assert.NotNil(t, err)
	assert.Equal(t, int64(1), c1.CollectionID)

	c1, err = mt.GetCollectionByName(collName1, tsoStart)
	assert.NotNil(t, err)
	c2, err = mt.GetCollectionByName(collName2, tsoStart)
	assert.NotNil(t, err)

	getKeys := func(m map[string]*model.Collection) []string {
		keys := make([]string, 0, len(m))
		for key := range m {
			keys = append(keys, key)
		}
		return keys
	}

	s1, err := mt.ListCollections(0)
	assert.Nil(t, err)
	assert.Equal(t, 2, len(s1))
	assert.ElementsMatch(t, getKeys(s1), []string{collName1, collName2})

	s1, err = mt.ListCollections(t2)
	assert.Nil(t, err)
	assert.Equal(t, 2, len(s1))
	assert.ElementsMatch(t, getKeys(s1), []string{collName1, collName2})

	s1, err = mt.ListCollections(t1)
	assert.Nil(t, err)
	assert.Equal(t, 1, len(s1))
	assert.ElementsMatch(t, getKeys(s1), []string{collName1})

	s1, err = mt.ListCollections(tsoStart)
	assert.Nil(t, err)
	assert.Equal(t, 0, len(s1))

	p1, err := mt.GetPartitionByName(collID1, partName1, 0)
	assert.Nil(t, err)
	p2, err := mt.GetPartitionByName(collID2, partName2, 0)
	assert.Nil(t, err)
	assert.Equal(t, int64(partID1), p1)
	assert.Equal(t, int64(partID2), p2)

	p1, err = mt.GetPartitionByName(collID1, partName1, t2)
	assert.Nil(t, err)
	p2, err = mt.GetPartitionByName(collID2, partName2, t2)
	assert.Nil(t, err)
	assert.Equal(t, int64(11), p1)
	assert.Equal(t, int64(12), p2)

	p1, err = mt.GetPartitionByName(1, partName1, t1)
	assert.Nil(t, err)
	_, err = mt.GetPartitionByName(2, partName2, t1)
	assert.NotNil(t, err)
	assert.Equal(t, int64(11), p1)

	_, err = mt.GetPartitionByName(1, partName1, tsoStart)
	assert.NotNil(t, err)
	_, err = mt.GetPartitionByName(2, partName2, tsoStart)
	assert.NotNil(t, err)

	var cID UniqueID
	cID, err = mt.GetCollectionIDByName(collName1)
	assert.NoError(t, err)
	assert.Equal(t, collID1, cID)

	_, err = mt.GetCollectionIDByName("badname")
	assert.Error(t, err)
}

func TestFixIssue10540(t *testing.T) {
	rand.Seed(time.Now().UnixNano())
	randVal := rand.Int()
	Params.Init()
	rootPath := fmt.Sprintf("/test/meta/%d", randVal)

	etcdCli, err := etcd.GetEtcdClient(&Params.EtcdCfg)
	assert.Nil(t, err)
	defer etcdCli.Close()

	skv, err := kvmetestore.NewMetaSnapshot(etcdCli, rootPath, TimestampPrefix, 7)
	assert.Nil(t, err)
	assert.NotNil(t, skv)
	//txnKV := etcdkv.NewEtcdKVWithClient(etcdCli, rootPath)
	txnKV := memkv.NewMemoryKV()
	// compose rc7 legace tombstone cases
	txnKV.Save(path.Join(kvmetestore.SegmentIndexMetaPrefix, "2"), string(kvmetestore.SuffixSnapshotTombstone))
	txnKV.Save(path.Join(kvmetestore.IndexMetaPrefix, "3"), string(kvmetestore.SuffixSnapshotTombstone))

	_, err = NewMetaTable(context.TODO(), txnKV, skv)
	assert.Nil(t, err)
}

func TestMetaTable_GetSegmentIndexInfos(t *testing.T) {
	meta := &MetaTable{
		segID2IndexMeta: map[typeutil.UniqueID]map[typeutil.UniqueID]model.Index{},
	}

	segID := typeutil.UniqueID(100)
	_, err := meta.GetSegmentIndexInfos(segID)
	assert.Error(t, err)

	meta.segID2IndexMeta[segID] = map[typeutil.UniqueID]model.Index{
		5: {
			CollectionID: 1,
			FieldID:      4,
			IndexID:      5,
			SegmentIndexes: map[int64]model.SegmentIndex{
				segID: {
					Segment: model.Segment{
						SegmentID:   segID,
						PartitionID: 2,
					},
					BuildID:     6,
					EnableIndex: true,
				},
			},
		},
	}
	infos, err := meta.GetSegmentIndexInfos(segID)
	assert.NoError(t, err)
	indexInfos, ok := infos[5]
	assert.True(t, ok)
	assert.Equal(t, typeutil.UniqueID(1), indexInfos.CollectionID)
	segmentIndex := indexInfos.SegmentIndexes[segID]
	segment := segmentIndex.Segment
	assert.Equal(t, typeutil.UniqueID(2), segment.PartitionID)
	assert.Equal(t, segID, segment.SegmentID)
	assert.Equal(t, typeutil.UniqueID(4), indexInfos.FieldID)
	assert.Equal(t, typeutil.UniqueID(5), indexInfos.IndexID)
	assert.Equal(t, typeutil.UniqueID(6), segmentIndex.BuildID)
	assert.Equal(t, true, segmentIndex.EnableIndex)
}

func TestMetaTable_unlockGetCollectionInfo(t *testing.T) {
	t.Run("normal case", func(t *testing.T) {
		mt := &MetaTable{
			collName2ID: map[string]typeutil.UniqueID{"test": 100},
			collID2Meta: map[typeutil.UniqueID]model.Collection{
				100: {CollectionID: 100, Name: "test"},
			},
		}
		info, err := mt.unlockGetCollectionInfo("test")
		assert.NoError(t, err)
		assert.Equal(t, UniqueID(100), info.CollectionID)
		assert.Equal(t, "test", info.Name)
	})

	t.Run("collection name not found", func(t *testing.T) {
		mt := &MetaTable{collName2ID: nil, collAlias2ID: nil}
		_, err := mt.unlockGetCollectionInfo("test")
		assert.Error(t, err)
	})

	t.Run("name found, meta not found", func(t *testing.T) {
		mt := &MetaTable{
			collName2ID:  map[string]typeutil.UniqueID{"test": 100},
			collAlias2ID: nil,
			collID2Meta:  nil,
		}
		_, err := mt.unlockGetCollectionInfo("test")
		assert.Error(t, err)
	})

	t.Run("alias found, meta not found", func(t *testing.T) {
		mt := &MetaTable{
			collName2ID:  nil,
			collAlias2ID: map[string]typeutil.UniqueID{"test": 100},
			collID2Meta:  nil,
		}
		_, err := mt.unlockGetCollectionInfo("test")
		assert.Error(t, err)
	})
}

func TestMetaTable_checkFieldCanBeIndexed(t *testing.T) {
	t.Run("field not indexed", func(t *testing.T) {
		mt := &MetaTable{}
		collMeta := model.Collection{
			FieldIndexes: []*model.Index{{FieldID: 100, IndexID: 200}},
		}
		fieldSchema := model.Field{
			FieldID: 101,
		}
		idxInfo := &model.Index{}
		err := mt.checkFieldCanBeIndexed(collMeta, fieldSchema, idxInfo)
		assert.NoError(t, err)
	})

	t.Run("field already indexed", func(t *testing.T) {
		mt := &MetaTable{
			indexID2Meta: map[typeutil.UniqueID]model.Index{
				200: {IndexID: 200, IndexName: "test"},
			},
		}
		collMeta := model.Collection{
			Name:         "test",
			FieldIndexes: []*model.Index{{FieldID: 100, IndexID: 200}},
		}
		fieldSchema := model.Field{Name: "test", FieldID: 100}
		idxInfo := &model.Index{IndexName: "not_test"}
		err := mt.checkFieldCanBeIndexed(collMeta, fieldSchema, idxInfo)
		assert.Error(t, err)
	})

	t.Run("unexpected", func(t *testing.T) {
		mt := &MetaTable{
			// index meta incomplete.
			indexID2Meta: map[typeutil.UniqueID]model.Index{},
		}
		collMeta := model.Collection{
			Name:         "test",
			CollectionID: 1000,
			FieldIndexes: []*model.Index{{FieldID: 100, IndexID: 200}},
		}
		fieldSchema := model.Field{Name: "test", FieldID: 100}
		idxInfo := &model.Index{IndexName: "not_test"}
		err := mt.checkFieldCanBeIndexed(collMeta, fieldSchema, idxInfo)
		assert.NoError(t, err)
	})
}

func TestMetaTable_checkFieldIndexDuplicate(t *testing.T) {
	t.Run("index already exists", func(t *testing.T) {
		mt := &MetaTable{
			indexID2Meta: map[typeutil.UniqueID]model.Index{
				200: {IndexID: 200, IndexName: "test"},
			},
		}
		collMeta := model.Collection{
			Name:         "test",
			FieldIndexes: []*model.Index{{FieldID: 100, IndexID: 200}},
		}
		fieldSchema := model.Field{Name: "test", FieldID: 101}
		idxInfo := &model.Index{IndexName: "test"}
		_, err := mt.checkFieldIndexDuplicate(collMeta, fieldSchema, idxInfo)
		assert.Error(t, err)
	})

	t.Run("index parameters mismatch", func(t *testing.T) {
		mt := &MetaTable{
			indexID2Meta: map[typeutil.UniqueID]model.Index{
				200: {IndexID: 200, IndexName: "test",
					IndexParams: []*commonpb.KeyValuePair{{Key: "Key", Value: "Value"}}},
			},
		}
		collMeta := model.Collection{
			Name:         "test",
			FieldIndexes: []*model.Index{{FieldID: 100, IndexID: 200}},
		}
		fieldSchema := model.Field{Name: "test", FieldID: 100}
		idxInfo := &model.Index{IndexName: "test", IndexParams: []*commonpb.KeyValuePair{{Key: "Key", Value: "not_Value"}}}
		_, err := mt.checkFieldIndexDuplicate(collMeta, fieldSchema, idxInfo)
		assert.Error(t, err)
	})

	t.Run("index parameters match", func(t *testing.T) {
		mt := &MetaTable{
			indexID2Meta: map[typeutil.UniqueID]model.Index{
				200: {IndexID: 200, IndexName: "test",
					IndexParams: []*commonpb.KeyValuePair{{Key: "Key", Value: "Value"}}},
			},
		}
		collMeta := model.Collection{
			Name:         "test",
			FieldIndexes: []*model.Index{{FieldID: 100, IndexID: 200}},
		}
		fieldSchema := model.Field{Name: "test", FieldID: 100}
		idxInfo := &model.Index{IndexName: "test", IndexParams: []*commonpb.KeyValuePair{{Key: "Key", Value: "Value"}}}
		duplicate, err := mt.checkFieldIndexDuplicate(collMeta, fieldSchema, idxInfo)
		assert.NoError(t, err)
		assert.True(t, duplicate)
	})

	t.Run("field not found", func(t *testing.T) {
		mt := &MetaTable{}
		collMeta := model.Collection{
			FieldIndexes: []*model.Index{{FieldID: 100, IndexID: 200}},
		}
		fieldSchema := model.Field{
			FieldID: 101,
		}
		idxInfo := &model.Index{}
		duplicate, err := mt.checkFieldIndexDuplicate(collMeta, fieldSchema, idxInfo)
		assert.NoError(t, err)
		assert.False(t, duplicate)
	})
}