example of a complex avro union

complexunion.avdl

record FirstType {
    union { null, int } field1 = null;
    union { null, int } field2 = null;
}

record SecondType {
    union { null, long } someOtherField = null;
}

record MyAvroObjec {

    /** This is fine */
    union { null, FirstType } notAComplexUnion = null;

    /** Spark can't load this */
    union { null, FirstType, SecondType } complexUnion = null;
}