df.groupBy { 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 GroupBy

name		group
firstName	lastName
Alice	Cooper	DataFrame 1 x 5
Bob	Dylan	DataFrame 1 x 5
Charlie	Daniels	DataFrame 1 x 5
Charlie	Chaplin	DataFrame 1 x 5
Bob	Marley	DataFrame 1 x 5
Alice	Wolf	DataFrame 1 x 5
Charlie	Byrd	DataFrame 1 x 5

df.groupBy { city and name.lastName }

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 GroupBy

city	lastName	group
London	Cooper	DataFrame 1 x 5
Dubai	Dylan	DataFrame 1 x 5
Moscow	Daniels	DataFrame 1 x 5
Milan	Chaplin	DataFrame 1 x 5
Tokyo	Marley	DataFrame 1 x 5
null	Wolf	DataFrame 1 x 5
Moscow	Byrd	DataFrame 1 x 5

df.groupBy { age / 10 named "ageDecade" }

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 GroupBy

ageDecade	group
1	DataFrame 1 x 5
4	DataFrame 2 x 5
2	DataFrame 2 x 5
3	DataFrame 2 x 5