data_table
col_1 col_2 col_3 col_4
car train plane book
bike pen car Null
tempo train car laptop
Null train tempo book
预期输出
distinct_value count_col_1 count_col_2 count_col_3 count_col_4
car 1 0 2 0
bike 1 0 0 0
tempo 1 0 1 0
train 0 3 0 0
plane 0 0 1 0
laptop 0 0 0 1
book 0 0 0 2
pen 0 1 0 0
有人可以帮忙吗？