java - Convert RDD List to RDD of individual element in spark

Question

I have a input rdd (JavaRDD<List<String>>) and i want to convert it to JavaRDD<String> as output.
Each element of input RDD list should become a individual element in output rdd.

how to achieve it in java?

JavaRDD<List<String>> input; //suppose rdd length is 2
input.saveAsTextFile(...) 

output:

[a,b]
[c,d]

what i want:

a
b
c
d

Answer 1

Convert it into a DataFrame and use Explode UDF function.