Adding columns with the information where imputed.

[jjanborowka]

Adding separate PipeOpPreproces function is required to create columns with the information where imputation will happen. I will do this. This issue is only to inform you about the problem with the current solution.

[jjanborowka]

Solution to this problem already exists in mlr3 and it looks like this.

col_0_1 <- PipeOpMissInd$new()
col_0_1$param_set$values$affect_columns <- selector_type(c("factor", "ordered", "character",'numeric','integer'))

impgraph = list(
PipeOpMissMDA_MFA$new(),
col_0_1
) %>>% po("featureunion")

.