Wrong result update float_column in undirect_update

Wrong result when float column was appended into where condition
query: update t set float_cloumn=1.1, pk=2 where pk=1;
before distribution: update t set float_cloumn=1.1, pk=2 where pk=1 and float_column=origin
now distribution: update t set float_cloumn=1.1, pk=2 where pk=1