Github user wmellouli commented on the issue:
https://github.com/apache/spark/pull/22332
@HyukjinKwon even instead of using the actual method `withColumn(colName:
String, col: Column)` we can just add a column and select. The idea from this
PR is to add more power/flexibility to withColumn method to cover more use
cases, without affecting performance or backward compatibility.
IMO using withColumn is more natural and hides adding/replacing + select
logic, in one operation.
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