scala - Creating nested columns in spark columns with multiple rows -


i trying create nested column in spark dataframe - 

a | b | [1,2, null] | [3, null, null] | [5,6,7]

the printschema dataframe follows - 

|--a: string (nullable = true) |--b: struct (nullable = true) |  |--x: long (nullable = true) |  |--y: long (nullable = true) |  |--z: long (nullable = true)

i want dataframe nested - 

a | b | [[1,2,null],[3,null,null],[5,6,7]]

and printschema should give same result before. i've tried take first row array of fields , concatenate remaining rows not working. can suggest how can desired results ? in advance.


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