schema
Returns DataFrameSchema object with DataFrame schema description. It can be printed to see column structure.
ColumnGroups are marked by indentation:
df.schema()Output:
name:
firstName: String
lastName: String
age: Int
city: String?
weight: Int?
isHappy: BooleanFrameColumns are marked with *:
df.groupBy { city }.schema()Output:
city: String?
group: *
name:
firstName: String
lastName: String
age: Int
city: String?
weight: Int?
isHappy: Boolean