copr: remove nullable signature for math expressions (#8335)
copr: remove nullable signature for math expressions (#8335)

Signed-off-by: xxchan <cde0d8c30f2507707736ea6425aab854c60f7386@sjtu.edu.cn>
BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,pingcap/tikv,c4pt0r/tikv,pingcap/tikv