[jira] [Created] (SPARK-21989) createDataset and the schema of encoder class

["taiho choi (JIRA)" <ji...@apache.org>]

taiho choi created SPARK-21989:
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             Summary: createDataset and the schema of encoder class
                 Key: SPARK-21989
                 URL: https://issues.apache.org/jira/browse/SPARK-21989
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: taiho choi


Hello.

public class SampleData implements Serializable {
    public String str;
}

        ArrayList<String> arr= new ArrayList();
        arr.add("{\"str\": \"everyone\"}");
        arr.add("{\"str\": \"Hello\"}");

        JavaRDD<SampleData> data2 = sc.parallelize(arr).map(v -> {return new Gson().fromJson(v, SampleData.class);});
        Dataset<SampleData> df = sqc.createDataset(data2.rdd(), Encoders.bean(SampleData.class));
        df.printSchema();

expected result of printSchema is str field of sampleData class.
actual result is following.
root

and if i call df.show() it displays like following.
++
||
++
||
||
++
what i expected is , "hello", "everyone" will be displayed.





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