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Posted to user@spark.apache.org by 1266 <10...@qq.com> on 2019/03/23 15:45:18 UTC
JavaRDD and WrappedArrays type iterate
Hi everyone ,
I have encountered some problems when using spark,
I have encountered a type of WrappedArray(), I don't know how to iterate over this type, or how to convert this type to a List or an Array?
Also, after I convert the dataframe type data into JavaRDD, the data type is JavaRDD[Row]. I don't know how to traverse this JavaRDD type. I use foreach(x=>println(x)) for output, but throw exception:<console>:30: error: missing parameter type
If anyone knows how to solve this, I am really grateful. After all, these problems have bothered me for the whole two days.
Warm regards,
Sanders Wang