df.distinct { age and name }

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

Output DataFrame: rowsCount = 7, columnsCount = 2

age	name
	firstName	lastName
15	Alice	Cooper
45	Bob	Dylan
20	Charlie	Daniels
40	Charlie	Chaplin
30	Bob	Marley
20	Alice	Wolf
30	Charlie	Byrd

df.select { age and name }.distinct()

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: DataFrame: rowsCount = 7, columnsCount = 2

age	name
	firstName	lastName
15	Alice	Cooper
45	Bob	Dylan
20	Charlie	Daniels
40	Charlie	Chaplin
30	Bob	Marley
20	Alice	Wolf
30	Charlie	Byrd

Output DataFrame: rowsCount = 7, columnsCount = 2

age	name
	firstName	lastName
15	Alice	Cooper
45	Bob	Dylan
20	Charlie	Daniels
40	Charlie	Chaplin
30	Bob	Marley
20	Alice	Wolf
30	Charlie	Byrd