Input DataFrame: rowsCount = 7, columnsCount = 5

name		age	city	weight	isHappy
firstName	lastName
Alice	Cooper	15	London	54	true
Bob	Dylan	45	Dubai	87	true
Charlie	Daniels	20	Moscow	null	false
Charlie	Chaplin	40	Milan	null	true
Bob	Marley	30	Tokyo	68	true
Alice	Wolf	20	null	55	false
Charlie	Byrd	30	Moscow	90	true

Step 1: Convert

class org.jetbrains.kotlinx.dataframe.api.Convert

Output DataFrame: rowsCount = 7, columnsCount = 5

name			age	city	weight	isHappy
firstName	lastName	fullName
Alice	Cooper	Alice Cooper	15	London	54	true
Bob	Dylan	Bob Dylan	45	Dubai	87	true
Charlie	Daniels	Charlie Daniels	20	Moscow	null	false
Charlie	Chaplin	Charlie Chaplin	40	Milan	null	true
Bob	Marley	Bob Marley	30	Tokyo	68	true
Alice	Wolf	Alice Wolf	20	null	55	false
Charlie	Byrd	Charlie Byrd	30	Moscow	90	true