Hi,
I just wrote this code to help you. Is it what you need ??
SparkConf conf = new
SparkConf().setAppName("hello").setMaster("local");
JavaSparkContext sc = new JavaSparkContext(conf);
SQLContext sqlContext = new SQLContext(sc);
List<Person> persons = new ArrayList<>();
persons.add(new Person("nihed", "mbarek", "nihed.com"));
persons.add(new Person("mark", "zuckerberg", "facebook.com"));
DataFrame df = sqlContext.createDataFrame(persons, Person.class);
df.show();
final String[] columns = df.columns();
Column[] selectColumns = new Column[columns.length + 1];
for (int i = 0; i < columns.length; i++) {
selectColumns[i]=df.col(columns[i]);
}
selectColumns[columns.length]=functions.concat(df.col("firstname"),
df.col("lastname"));
df.select(selectColumns).show();
-------------------
public static class Person {
private String firstname;
private String lastname;
private String address;
}
Regards,
On Mon, Jul 18, 2016 at 12:45 PM, Abhishek Anand <[email protected]>
wrote:
> Hi,
>
> I have a dataframe say having C0,C1,C2 and so on as columns.
>
> I need to create interaction variables to be taken as input for my
> program.
>
> For eg -
>
> I need to create I1 as concatenation of C0,C3,C5
>
> Similarly, I2 = concat(C4,C5)
>
> and so on ..
>
>
> How can I achieve this in my Java code for concatenation of any columns
> given input by the user.
>
> Thanks,
> Abhi
>
--
M'BAREK Med Nihed,
Fedora Ambassador, TUNISIA, Northern Africa
http://www.nihed.com
<http://tn.linkedin.com/in/nihed>
