I’m working on spark, using scala, i have 2 DataFrames

Schema of DF 1 –

 root
 |-- employee: struct (nullable = true)
 |    |-- name: string (nullable = true)
 |    |-- id: string (nullable = true)
 |    |-- salary: long (nullable = true)
 |    |-- dept: string (nullable = true)
 |--....

Schema of DF 2-

 root
 |-- employee: struct (nullable = true)
 |    |-- name: string (nullable = true)
 |    |-- id: string (nullable = true)
 |    |-- salary: long (nullable = true)
 |    |-- dept: string (nullable = true)
 |.   |-- phone: string (nullable = false)

how can i add phone field to employee field on DF1,

Note: not all employees of DF1 are in DF2, so if employee not present in DF2, the phone field should be set with 000