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

You can merge multiple dataframe columns into one using array.

// $"*" will capture all existing columns
df.select($"*", array($"col1", $"col2").as("newCol"))