fix reader component bug
fix reader component bug

Signed-off-by: dbdfbf6ed6e9df460967725ea9e4f74d6a99e7f0@163.com <dbdfbf6ed6e9df460967725ea9e4f74d6a99e7f0@163.com>

FederatedAI/FATE,FederatedAI/FATE,FederatedAI/FATE