I am trying to read a dataframe which is created using nested jSON. Somehow i am not able to read the one of the nested key and get error.

val df=spark.read.json(Seq("""
[{
    "testPlans": [{
        "attr1": "abc"
    }, {
        "attr2": "bac",
        "attr3": [{
            "uniqueId": "111"
        }]
    }]
}]""").toDS())

df.select("testPlans.attr1","testPlans.attr2","testPlans.attr3.uniqueId").show()