na.fill doesn't work

[Javier Rey]

Hi everybody,

I have a data frame after many transformation, my final task is fill na's
with zeros, but I run this command : df_fil1 = df_fil.na.fill(0), but this
command doesn't work nulls doesn't disappear.

I did a toy test it works correctly.

I don't understand what happend.

Thanks in advance.

Samir