I have a schema as shown below. How can I parse the nested objects?
root
|-- apps: array (nullable = true)
| |-- element: struct (containsNull = true)
| | |-- appName: string (nullable = true)
| | |-- appPackage: string (nullable = true)
| | |-- Ratings: array (nullable = true)
| | | |-- element: struct (containsNull = true)
| | | | |-- date: string (nullable = true)
| | | | |-- rating: long (nullable = true)
|-- id: string (nullable = true)
Assuming you read in a json file and print the schema you are showing us like this:
DataFrame df = sqlContext.read().json("/path/to/file").toDF();
df.registerTempTable("df");
df.printSchema();
Then you can select nested objects inside a struct type like so...
DataFrame app = df.select("app");
app.registerTempTable("app");
app.printSchema();
app.show();
DataFrame appName = app.select("element.appName");
appName.registerTempTable("appName");
appName.printSchema();
appName.show();