raftstore: use new approximate keys function when result is 0 (#5403)
raftstore: use new approximate keys function when result is 0 (#5403)

Signed-off-by: root <d046ed4ccb48113a1cfb6836902d451889cc779c@gmail.com>
Signed-off-by: you06 <d046ed4ccb48113a1cfb6836902d451889cc779c@gmail.com>
BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,pingcap/tikv,c4pt0r/tikv,pingcap/tikv,BusyJay/tikv