How to parse nested JSON objects in spark sql? -


i have schema shown below. how can parse 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 read in json file , print schema showing this:

dataframe df = sqlcontext.read().json("/path/to/file").todf();     df.registertemptable("df");     df.printschema();

then can select nested objects inside struct type 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();

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