Strategy support min, max, mean or value. If min, will replace missing value with min of the column. If max, will replace missing value with max of the column. If mean, will replace missing value with mean of the column. If value, will replace missing value with the value.

Results

0    a    10.000000    100
1    a    1.400000    1
4    c    100.200000    1
6    d    -99.900000    100