Fix GetIndexByName (#8780)

Signed-off-by: Yusup <yusup@lsgrep.com>

internal/rootcoord/meta_table.go

@@ -811,7 +811,10 @@ func (mt *MetaTable) DropIndex(collName, fieldName, indexName string, ts typeuti
 
 	collID, ok := mt.collName2ID[collName]
 	if !ok {
-		return 0, false, fmt.Errorf("collection name = %s not exist", collName)
+		collID, ok = mt.collAlias2ID[collName]
+		if !ok {
+			return 0, false, fmt.Errorf("collection name = %s not exist", collName)
+		}
 	}
 	collMeta, ok := mt.collID2Meta[collID]
 	if !ok {
@@ -933,7 +936,10 @@ func (mt *MetaTable) GetFieldSchema(collName string, fieldName string) (schemapb
 func (mt *MetaTable) unlockGetFieldSchema(collName string, fieldName string) (schemapb.FieldSchema, error) {
 	collID, ok := mt.collName2ID[collName]
 	if !ok {
-		return schemapb.FieldSchema{}, fmt.Errorf("collection %s not found", collName)
+		collID, ok = mt.collAlias2ID[collName]
+		if !ok {
+			return schemapb.FieldSchema{}, fmt.Errorf("collection %s not found", collName)
+		}
 	}
 	collMeta, ok := mt.collID2Meta[collID]
 	if !ok {
@@ -987,7 +993,10 @@ func (mt *MetaTable) GetNotIndexedSegments(collName string, fieldName string, id
 	}
 	collID, ok := mt.collName2ID[collName]
 	if !ok {
-		return nil, schemapb.FieldSchema{}, fmt.Errorf("collection %s not found", collName)
+		collID, ok = mt.collAlias2ID[collName]
+		if !ok {
+			return nil, schemapb.FieldSchema{}, fmt.Errorf("collection %s not found", collName)
+		}
 	}
 	collMeta, ok := mt.collID2Meta[collID]
 	if !ok {
@@ -1091,7 +1100,10 @@ func (mt *MetaTable) GetIndexByName(collName, indexName string) (pb.CollectionIn
 
 	collID, ok := mt.collName2ID[collName]
 	if !ok {
-		return pb.CollectionInfo{}, nil, fmt.Errorf("collection %s not found", collName)
+		collID, ok = mt.collAlias2ID[collName]
+		if !ok {
+			return pb.CollectionInfo{}, nil, fmt.Errorf("collection %s not found", collName)
+		}
 	}
 	collMeta, ok := mt.collID2Meta[collID]
 	if !ok {

internal/rootcoord/task.go

@@ -274,6 +274,8 @@ func (t *DropCollectionReqTask) Execute(ctx context.Context) error {
 		return fmt.Errorf("TSO alloc fail, error = %w", err)
 	}
 
+	aliases := t.core.MetaTable.ListAliases(collMeta.ID)
+
 	// use lambda function here to guarantee all resources to be released
 	dropCollectionFn := func() error {
 		// lock for ddl operation
@@ -329,6 +331,20 @@ func (t *DropCollectionReqTask) Execute(ctx context.Context) error {
 	// error doesn't matter here
 	t.core.proxyClientManager.InvalidateCollectionMetaCache(ctx, &req)
 
+	for _, alias := range aliases {
+		req = proxypb.InvalidateCollMetaCacheRequest{
+			Base: &commonpb.MsgBase{
+				MsgType:   0, //TODO, msg type
+				MsgID:     0, //TODO, msg id
+				Timestamp: ts,
+				SourceID:  t.core.session.ServerID,
+			},
+			DbName:         t.Req.DbName,
+			CollectionName: alias,
+		}
+		t.core.proxyClientManager.InvalidateCollectionMetaCache(ctx, &req)
+	}
+
 	// Update DDOperation in etcd
 	return t.core.setDdMsgSendFlag(true)
 }