copr: support extract scalar value from bit (#11980)
copr: support extract scalar value from bit (#11980)

close tikv/tikv#11893

Signed-off-by: yisaer <disxiaofei@163.com>

Co-authored-by: Ti Chi Robot <040e6455cde1c91e876ec337e785ce913eacba35@tidb.io>
BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv