fix scanNamed

weed/filer/ydb/ydb_store_kv.go

@@ -3,6 +3,7 @@ package ydb
 import (
 	"context"
 	"fmt"
+
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/filer/abstract_sql"
 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -42,12 +43,14 @@ func (store *YdbStore) KvGet(ctx context.Context, key []byte) (value []byte, err
 			return fmt.Errorf("kv get execute %s: %v", util.NewFullPath(dirStr, name).Name(), err)
 		}
 		defer func() { _ = res.Close() }()
-		for res.NextRow() {
-			if err := res.ScanNamed(named.Required("meta", &value)); err != nil {
-				return fmt.Errorf("scanNamed %s : %v", util.NewFullPath(dirStr, name).Name(), err)
+		for res.NextResultSet(ctx) {
+			for res.NextRow() {
+				if err := res.ScanNamed(named.OptionalWithDefault("meta", &value)); err != nil {
+					return fmt.Errorf("scanNamed %s : %v", util.NewFullPath(dirStr, name).Name(), err)
+				}
+				valueFound = true
+				return nil
 			}
-			valueFound = true
-			return nil
 		}
 		return res.Err()
 	})