StudentActivityNew.avsc

{
    "namespace": "com.rishav.avro",
    "type": "record",
    "name": "StudentActivity",
    "fields": [
        {
            "name": "id",
            "type": "string"
        },
        {
            "name": "student_id",
            "type": "int"
        },
        {
			"name": "age",
			"type": ["null", "int"],
			"default": null
		},
        {
            "name": "course_details",
            "type": {
                "name": "Activity",
                "type": "record",
                "fields": [
                    {
                        "name": "course_id",
                        "type": "int"
                    },
                    {
                        "name": "enroll_date",
                        "type": "string"
                    },
                    {
                        "name": "verb",
                        "type": "string"
                    },
                    {
                        "name": "score",
                        "type": "double",
                        "aliases": ["result_score"]
                    }
                ]
            }
        }
    ]
}