Hi @Hubert Dudek​ , to do that I must also add this new column in the target delta table, which I don't want to do. Adding this new column only in the dataframe to write will not work because of two reasons,

1. delta will give a schema mismacth error while writing.
2. I think the replaceWhere condition is basically applied on the target delta table and not on the input dataframe. So the condition should be on some columns which is already existing in the table.