* define binary data type
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* typo
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* refine code
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>
Co-authored-by: Nshengjun.li <shengjun.li@zilliz.com>