optimise sql

Signed-off-by: jiefenghuang <[email protected]>

pkg/meta/sql.go

@@ -4486,19 +4486,25 @@ func (m *dbMeta) getDirFetcher() dirFetcher {
 	return func(ctx Context, inode Ino, cursor interface{}, offset, limit int, plus bool) (interface{}, []*Entry, error) {
 		var entries []*Entry
 		err := m.roTxn(func(s *xorm.Session) error {
-			s = s.Table(&edge{})
-			if plus {
-				s = s.Join("INNER", &node{}, "jfs_edge.inode=jfs_node.inode")
-			}
 			iCursor := offset
 			if cursor != nil {
 				iCursor = cursor.(int)
 			}
-			s = s.Limit(limit, iCursor).OrderBy("jfs_edge.inode")
+
+			var ids []int64
+			if err := s.Table(&edge{}).Cols("id").Where("parent = ?", inode).Limit(limit, iCursor).Find(&ids); err != nil {
+				return err
+			}
+
+			s = s.Table(&edge{}).Cols("jfs_edge.inode", "jfs_edge.name", "jfs_edge.type").In("jfs_edge.id", ids)
+			if true {
+				s = s.Join("INNER", &node{}, "jfs_edge.inode=jfs_node.inode")
+			}
 			var nodes []namedNode
-			if err := s.Find(&nodes, &edge{Parent: inode}); err != nil {
+			if err := s.Find(&nodes); err != nil {
 				return err
 			}
+
 			for _, n := range nodes {
 				if len(n.Name) == 0 {
 					logger.Errorf("Corrupt entry with empty name: inode %d parent %d", n.Inode, inode)