How to merge two columns of a `Dataframe` in Spark into one 2-Tuple?

Question

I have a Spark DataFrame df with five columns. I want to add another column with its values being the tuple of the first and second columns. When u

Answer 1

If you want to merge two dataframe columns into one column. Just:

import org.apache.spark.sql.functions.array
df.withColumn("NewColumn", array("columnA", "columnB"))