I've been looking at the source code of the PySpark date_add function (https://spark.apache.org/docs/latest/api/python/_modules/pyspark/sql/functions.html#date_add) and I'm wondering why the days input variable is not cast to a java column like the start variable. This effectively means that when working with data frames, you can only add one number of days to all of your dates. I think it would make more sense to cast the days variable to a java column, so that you could add different days to different dates. The jvm function date_add has no problem doing this because I can add a date and integer column using the expr function (expr("date_add(start, days)"). And if you wanted to add the same date, you could just make a lit column with the same number. This argument applies to the functions date_sub and add_months as well.
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