mysql/decimal: fix a bug in do_div_mod when divisor/dividend is 0  (#3099)
mysql/decimal: fix a bug in do_div_mod when divisor/dividend is 0  (#3099)


BusyJay/tikv,BusyJay/tikv,pingcap/tikv,BusyJay/tikv,c4pt0r/tikv,pingcap/tikv,BusyJay/tikv